worked monthly example$25.92
Running costs
How much does a window AC cost to run?
At an illustrative 600W average and $0.18/kWh, eight hours daily costs $25.92 over 30 days. See the assumptions and how to use your own rate.
The small-home library · 120 guides
Understand appliance running costs
Understand your electricity rate, estimate appliance costs and challenge the assumptions.
From a reading to a useful estimate
First identify the unit and the tariff. Then choose a representative schedule. Compare individual appliance costs without treating them as a forecast of the whole bill.
Choose an example: microwave input watts, range hood fan and lights, or computer sleep versus shutdown. Buying a replacement? Compare the complete purchase and electricity cost.
make your bill make sense¢ → $
Running costs
How to find your electricity rate on your bill
Separate per-kWh supply and delivery charges from fixed fees, credits and balances. See a sample bill and choose the right calculator rate.
worked monthly example$14.58
Running costs
How much does a dehumidifier cost to run?
Calculate dehumidifier electricity cost from watts, runtime and your tariff, then see why humidity, capacity and cycling can change the monthly total.
a decision, not a deadlineBreak-even
Running costs
Is replacing an old window AC worth it?
Compare an old and new window AC using purchase price, annual kWh, electricity rate and ownership years before deciding whether replacement pays.
start with a measured periodkWh → $
Running costs
How to measure appliance electricity use at home
Learn how kWh readings and elapsed time become average watts and estimated cost. See an example log, measurement limits and compatibility checks.
5 W · illustrative annual cost$7.88
Running costs
Is standby power worth worrying about? Do the math first
Calculate standby power cost from measured watts and time, then compare the possible savings with safety, convenience and the cost of extra devices.
same kWh, different costWhen matters
Running costs
How time-of-use electricity rates change appliance costs
Calculate appliance costs across peak and off-peak electricity rates, then estimate what shifting a safe, flexible load could actually save.
one bulb · illustrative annual saving$13.40
Running costs
How much can LED lighting save in a small apartment?
Calculate LED lighting cost and savings from bulb watts, hours and electricity rate while comparing equal brightness rather than package claims.
350 kWh/year · monthly average example$5.25
Running costs
How much does a small refrigerator cost to run?
Estimate a small refrigerator or mini fridge running cost from annual kWh or a representative measurement instead of assuming constant compressor draw.
30 W · illustrative 30-day cost$3.89
Running costs
How much does an air purifier cost to run?
Estimate air-purifier electricity and filter costs using fan speed, daily hours and replacement intervals for a more complete ownership comparison.
1,500 W at an example rate$0.27/hour
Running costs
How much does a 1,500-watt space heater cost to run?
A constant 1,500W draw costs $0.27 per hour at an illustrative $0.18/kWh. Compare monthly schedules, thermostat assumptions and essential safety limits.
0.9 kWh · illustrative cycle$0.16
Running costs
How much electricity does one dishwasher cycle cost?
Calculate dishwasher electricity cost per cycle and month, including repeated loads, heated drying and separately heated water when applicable.
300 kWh/year · worked example$4.50/month
Running costs
What does a small freezer add to your electricity bill?
Estimate a small freezer’s monthly and annual electricity cost from kWh and your tariff, then weigh the recurring cost against useful storage.
135 W · sample work schedule$4.28/month
Running costs
How to estimate the electricity cost of a home office
Add up laptop, desktop, monitors, dock and network equipment to estimate home-office electricity cost without double-counting shared devices.
80 W · illustrative viewing cost$1.73/month
Running costs
How much does your TV cost to run each month?
Calculate monthly TV electricity cost from watts and viewing hours, then include streaming boxes, consoles and audio equipment when relevant.
compare the same time scalekWh/day
Running costs
How to compare electricity bills with different billing periods
Compare electricity bills with different billing periods using daily kWh, while separating consumption changes from tariffs, fees and weather.
1,500 W for four minutes · example$0.018
Running costs
How much does it cost to boil an electric kettle?
Calculate electric-kettle cost per boil from watts, minutes and your tariff, then compare complete boiling sessions instead of wattage labels alone.
two different watt figuresInput ≠ output
Running costs
Microwave Input vs Output Watts: Which Affects Your Bill?
Use microwave input watts—not cooking output—to estimate electricity cost, with a 10-minute example and an editable calculator scenario.
a label is a comparison toolRead the basis
Running costs
How to compare EnergyGuide labels and estimated costs
Compare like-for-like EnergyGuide labels, convert annual kWh using your rate and calculate energy-only payback with a transparent example.
power multiplied by timeW → kW → kWh
Running costs
Watts, kilowatts and kilowatt-hours: a practical guide
Learn the difference between watts, kilowatts and kilowatt-hours, use the watts-to-kWh formula and reproduce practical appliance examples.
change one assumption at a timePrice × use
Running costs
What a higher electricity rate changes in your household budget
Calculate how an electricity rate increase changes your household budget while keeping energy use, variable charges and fixed fees separate.
illustrative meal$0.11
Running costs
Induction Cooktop Running Cost: Estimate Each Meal
Estimate induction cooktop electricity cost from cooking stages or measured kWh. See a meal example and include cookware in a purchase decision.
illustrative session$0.14
Running costs
Toaster Oven Running Cost: Preheat, Cook and Compare
Calculate toaster oven electricity cost for a complete cooking session. Include preheating and compare equal portions with your full-size oven.
illustrative eight hours$0.22
Running costs
Slow Cooker Running Cost: What an Eight-Hour Meal Costs
Estimate slow cooker electricity cost without treating the rating as constant draw. Include warming time and calculate a cost per serving.
illustrative holding period$0.04
Running costs
Rice Cooker Keep-Warm Cost: Count Cooking and Holding
Calculate rice cooker keep-warm electricity separately from cooking. See an eight-hour example and learn which measurement can answer your question.
illustrative daily routine$0.06
Running costs
Coffee Maker Running Cost: Brewing vs Keeping It Hot
Work out coffee maker electricity cost by separating brewing, the warming plate and standby. Compare a daily pot with a measured session.
illustrative full cycle$0.12
Running costs
Electric Pressure Cooker Energy Use: Count the Full Cycle
Estimate pressure cooker electricity for heat-up, pressure cooking and warming. Compare complete recipes instead of the timer display alone.
illustrative saving per serving$0.07
Running costs
Does Batch Cooking Save Electricity? Compare Per Serving
Compare batch cooking electricity per serving, including extra batches and reheating. Use a worked example without assuming every larger meal saves.
illustrative preheat$0.11
Running costs
Oven Preheating Energy Cost: Measure the Missing Minutes
Estimate oven preheating electricity cost from measured kWh or input power, and see why temperature, oven type and warm-up time affect the result.
illustrative annual energy$98.55
Running costs
Second Fridge Electricity Cost: Monthly and Yearly Examples
Calculate a second refrigerator’s monthly and annual electricity cost from measured kWh, then decide whether the extra storage is worth keeping.
check the heating sourceTwo meters?
Running costs
Cold vs Warm Wash: Calculate the Energy Difference
Compare cold and warm laundry cycles while accounting for water heating outside the washer. Use equal loads and keep fabric-care needs in view.
count both appliancesNet saving
Running costs
Does a Faster Washer Spin Reduce Drying Energy?
Compare washer spin speed with dryer time and total kWh to test whether a faster final spin reduces complete laundry energy in your routine.
fair comparisonEqual dryness
Running costs
Sensor Dry vs Timed Dry: Compare Cost at Equal Dryness
Compare sensor and timed dryer cycles using the same laundry and dryness target. Include extra cycles instead of relying on minutes alone.
illustrative monthly fan$0.14
Running costs
Bathroom Exhaust Fan Cost Per Hour, Month and Year
Calculate bathroom exhaust-fan electricity cost per hour, month and year from watts and runtime, while keeping required ventilation unchanged.
illustrative monthly use$0.22
Running costs
Range Hood Electricity Cost: Calculate Fan and Light Use
Calculate range-hood electricity cost from fan watts, lighting and cooking time, with editable hourly and monthly examples for your tariff.
illustrative year$15.77
Running costs
Wi-Fi Router Electricity Cost: Estimate 24-Hour Use
Calculate router electricity cost from actual input or measured kWh. Separate the router, modem and other devices before estimating annual use.
illustrative added nodes/year$18.92
Running costs
Mesh Wi-Fi Energy Cost: Add Up Every Node
Estimate a mesh network’s electricity by counting all powered nodes and the gateway. Compare the added cost with the coverage you actually need.
illustrative battery-only energyAbout 1¢
Running costs
Laptop Charging Cost: Per Charge, Month and Workday
Calculate laptop charging cost per charge, month or workday, and avoid double-counting battery charging, plugged-in use, docks and monitors.
illustrative gaming/month$6.48
Running costs
Gaming PC Electricity Cost: Use Wall Power, Not PSU Size
Calculate a gaming PC’s electricity from gaming, idle and sleep periods. Include the monitor and avoid treating PSU capacity as constant consumption.
verify sleepState matters
Running costs
Computer Sleep vs Shutdown: How Much Electricity Can You Save?
Compare PC sleep, shutdown and active idle with an overnight cost table. Use your actual watts and schedule to see whether the saving is meaningful.
illustrative work month$0.95
Running costs
External Monitor Electricity Cost: Work Hours and Sleep
Estimate one or two monitors’ electricity using active and sleep periods. Account for brightness, USB charging and shared power measurements.
rest-mode settingsFeatures matter
Running costs
Game Console Rest Mode Cost: Check Enabled Features
Estimate console rest-mode electricity for your schedule. Check downloads, network access and USB charging instead of assuming one standby wattage.
useful measurementWeekly kWh
Running costs
Printer Standby Electricity: Measure the Week, Not One Page
Estimate printer standby, sleep and active electricity for occasional home use. Check model shutdown guidance and compare complete weekly energy.
illustrative annual idle cost$0.16
Running costs
USB Charger Idle Power: Is Unplugging Worth the Effort?
Put an unused USB charger’s electricity in perspective. Calculate a hypothetical idle load and understand why a meter may display zero.
marginal costNext kWh
Running costs
Tiered Electricity Rates: Calculate the Next kWh Correctly
Calculate fictional two-tier bills at 280, 300, 320 and 400 kWh. See why average rates can misstate appliance savings across a threshold.
use, charges, paymentThree columns
Running costs
Budget Billing vs Actual Usage: Why Payments Can Mislead
See how a steady payment can hide changing electricity charges. Track the balance with a three-month example and a free bill ledger.
before comparingRead dates
Running costs
Estimated Electricity Readings: Explain a Catch-Up Bill
Check whether electricity readings are actual or estimated before blaming an appliance. Compare meter dates and consumption across the full interval.
check each columnkWh ≠ kW
Running costs
Smart Meter Interval Data: Turn a Usage Download into Clues
Work through a four-row meter example, convert interval kWh to average watts, and check missing data before estimating electricity costs.
better baselineSeveral nights
Running costs
Apartment Baseload Electricity: Find the Always-On Pattern
Calculate average overnight watts, compare several observation periods and separate always-on consumption from an unexplained change.
not just amount dueCheck kWh
Running costs
Bill Credit or Energy Saving? Read a Lower Electric Bill
Compare three sample electricity bills to separate a one-time credit from reduced kWh. Track current charges without overstating annual savings.
seasonal context12 months
Running costs
Compare 12 Months of Electricity Costs Without Seasonal Bias
Build a yearly electricity comparison using kWh, days, rates and household changes. Distinguish historical spending from a forecast at today’s prices.
payback denominatorNet savings
Running costs
Energy-Saving Payback: Compare the Cost You Actually Add
Calculate simple energy payback from incremental cost and net annual savings. Distinguish replacement from a first purchase and test uncertain inputs.
first budget questionWho pays?
Running costs
Hot-Water Energy Budget for Renters: Find What You Pay For
Identify how your apartment heats and bills hot water before estimating savings. Separate electric, gas and shared systems and avoid double counting.
30-night example$1.62
Running costs
Electric Blanket Running Cost: Per Night and Per Month
Calculate an electric blanket’s cost from its rated watts, heat setting and hours used, with clear nightly and monthly examples.
1,500 W heat example27¢/hour
Running costs
Electric Fireplace Running Cost: Flame Effect vs Heater
Separate an electric fireplace’s visual flame effect from its heater when estimating hourly, daily and monthly electricity costs.
30 W monthly example$1.30
Running costs
Humidifier Running Cost: Cool Mist vs Warm Mist
Estimate humidifier electricity cost by technology, measured watts and runtime, while accounting for water, filters and proper care.
three-device example$5.18
Running costs
Aquarium Electricity Cost: Heater, Filter and Lights
Add the heater, filter, lights and other aquarium equipment without assuming every device runs at full power all day or follows one schedule.
illustrative monthly total$0.32
Running costs
Robot Vacuum Charging Cost: Per Cycle and Per Month
Estimate a robot vacuum’s charging and dock electricity without confusing battery capacity, wall input and advertised runtime.
30-minute example9¢
Running costs
Vacuum Cleaner Electricity Cost: Watts, Minutes and Sessions
Calculate vacuum-cleaner electricity from input watts and actual cleaning time, and avoid confusing suction ratings with billable power.
illustrative meal$0.31
Running costs
Electric Oven Running Cost: Preheat and Cooking Examples
Estimate an electric oven’s cost per meal by combining preheat, cooking and any heated waiting time instead of using maximum watts for the full session.
1,500 W full-power example27¢/hour
Running costs
Oil-Filled Radiator Running Cost: Thermostat and Timer Math
Estimate an oil-filled electric radiator’s hourly and monthly cost, then account for thermostat cycling without promising a fixed duty cycle.
10-minute example4.5¢
Running costs
Hair Dryer Electricity Cost: Per Use and Per Month
Calculate a hair dryer’s electricity cost from its input watts and minutes used, with examples for different routines and a safety check.
illustrative 30-day range$19–$41
Running costs
Window AC Cost to Run by BTU: 5,000 to 12,000 BTU Examples
Compare worked electricity-cost scenarios for 5,000, 6,000, 8,000 and 12,000 BTU window ACs without treating BTU as electrical watts.
500 W × 8-hour example72¢
Running costs
How Much Does It Cost to Run an Air Conditioner All Night?
Calculate an eight-hour AC cost from measured kWh or average watts, then compare mild and hot-night scenarios without assuming constant compressor power.
4.8 kWh/day example$25.92
Running costs
Dehumidifier Cost to Run 24/7: Daily and Monthly Examples
Calculate continuous dehumidifier cost correctly by separating connected time, compressor cycling and measured whole-day kWh.
a capacity rating, not power50 pints/day
Running costs
50-Pint Dehumidifier Cost to Run: Capacity Is Not Watts
Understand what a 50-pint rating means, how IEF relates water removal to energy, and how to estimate actual running cost from measured kWh.
2.5 kWh cycle example45¢
Running costs
Clothes Dryer Cost per Load: kWh, Time and Sensors
Estimate electric dryer cost from per-cycle kWh or a complete measurement, then compare load size, moisture sensors and heat-pump models.
750 W is not constant useNo
Running costs
Does a 750W Power Supply Use 750 Watts?
Understand why a PC power-supply rating is not its constant electricity use, then calculate cost from measured wall power across gaming, work and idle time.
illustrative 300 kWh/year$4.50
Running costs
Wine Fridge Electricity Cost per Month
Estimate wine fridge electricity cost per month from annual kWh or measured daily energy, then account for room temperature and door use.
illustrative 1.2 kWh wall input$0.22
Running costs
Portable Power Station Charging Cost from the Wall
Estimate portable power station charging cost from measured wall energy, battery capacity and electricity rate without ignoring charging losses.
30 W average for 30 days$3.89
Running costs
NAS Electricity Cost per Month: 24/7 Example
Calculate NAS electricity cost per month from a measured 24-hour average, then separate drives, sleep settings and backup activity.
5 W camera for 30 days$0.65
Running costs
Security Camera Electricity Cost for 24/7 Use
Estimate a security camera electricity cost for 24/7 use, including the camera, power adapter, recorder and network equipment boundaries.
illustrative 0.6 kWh loaf$0.11
Running costs
Bread Maker Electricity Cost per Loaf
Calculate bread maker electricity cost per loaf from a complete measured cycle, then separate baking energy from ingredient and standby costs.
300 W for one hour5.4¢
Running costs
Projector Electricity Cost per Hour and Movie
Calculate projector electricity cost per hour and per movie, including eco mode, streaming devices, speakers and standby where relevant.
illustrative 0.5 kWh wall charge9¢
Running costs
Electric Scooter Charging Cost per Charge
Estimate electric scooter charging cost per charge from measured wall energy, then compare battery capacity, partial charges and safe charging.
illustrative 1 kWh day$0.18
Running costs
Portable Ice Maker Electricity Cost per Day
Calculate portable ice maker electricity cost per day from a full-day meter reading, then separate active ice making from idle time.
illustrative 0.5 kWh/day$2.70
Running costs
Water Cooler Electricity Cost per Month
Estimate water cooler electricity cost per month from daily kWh, including separate hot, cold and on-demand operating patterns.
120 W for three hours$0.06
Running costs
Game Console Electricity Cost per Hour
Calculate game console electricity cost per hour and session, while keeping the TV, display, sound system and rest mode separate.
illustrative 0.6 kWh charge$0.11
Running costs
E-Bike Charging Cost per Charge
Estimate e-bike charging cost per charge from measured wall energy, then separate battery capacity, charging losses and safety.
1,500 W for 30 minutes$0.14
Running costs
Electric Grill Electricity Cost per Hour
Calculate electric grill electricity cost per hour or meal from watts and measured energy, accounting for preheating and thermostat cycling.
illustrative annual gap$27
Running costs
Chest vs. Upright Freezer Electricity Cost
Compare chest vs. upright freezer electricity cost using exact-model annual kWh, usable capacity, defrost design and room placement.
illustrative 20 W average$2.59
Running costs
Mini PC Electricity Cost per Month Running 24/7
Calculate mini PC electricity cost per month when running 24/7, with separate boundaries for monitors, storage and network equipment.
30 W for four hours daily$0.65
Running costs
Soundbar Electricity Cost per Month
Calculate soundbar electricity cost per month from active and standby power, keeping the television, subwoofer and rear speakers separate.
600 W for eight hours$0.86
Running costs
Food Dehydrator Electricity Cost per Batch
Calculate food dehydrator electricity cost per batch from measured kWh, drying time and your rate without assuming constant full power.
2,000 W for 30 minutes$0.18
Running costs
Clothes Iron Electricity Cost per Hour
Calculate clothes iron electricity cost per hour or session from rated watts and measured kWh, accounting for heat-up and thermostat cycling.
1,500 W for 15 minutes$0.07
Running costs
Garment Steamer Electricity Cost per Session
Estimate garment steamer electricity cost per session from heat-up, active steaming and measured kWh, with clear burn-safety limits.
illustrative annual total$0.69
Running costs
Electric Standing Desk Electricity Cost per Year
Calculate electric standing desk electricity cost per year from motor seconds, daily adjustments and measured standby power.
illustrative 5 W active schedule$2.63
Running costs
Streaming Stick Electricity Cost per Year
Estimate streaming stick electricity cost per year from active and network standby power, while keeping the television separate.
illustrative 4 W running 24/7$6.31
Running costs
Wi-Fi Extender Electricity Cost per Year
Calculate Wi-Fi extender electricity cost per year from 24/7 measured power and decide whether the extra network device is still needed.
50 W active plus 1 W sleep$2.25
Running costs
Dual Monitor Setup Electricity Cost per Month
Calculate dual monitor setup electricity cost per month by adding each display’s active and sleep energy without including the computer twice.
compare measured kWh per portionSame task
Running costs
Air Fryer vs. Microwave Electricity Cost
Compare air fryer vs. microwave electricity cost for the same food task using complete-session kWh, portions and cooking results.
include time, cycling and portionsPer meal
Running costs
Slow Cooker vs. Oven Electricity Cost per Meal
Compare slow cooker vs. oven electricity cost per meal from complete-session kWh, preheating, portions and equivalent cooking results.
illustrative session inputs$0.09 vs $0.03
Running costs
Toaster Oven vs. Microwave Electricity Cost per Meal
Compare toaster oven vs. microwave electricity cost per meal using input watts, complete cooking time, preheat and finished portions.
50 W for 8 hours daily$2.25
Running costs
Gaming Monitor Electricity Cost per Month
Calculate gaming monitor electricity cost per month from measured active, sleep and off-mode power without confusing refresh rate with watts.
12 W continuously$18.92
Running costs
Wi-Fi Modem Router Electricity Cost per Year
Estimate Wi-Fi modem router electricity cost per year from continuous measured watts, and separate one combined gateway from two devices.
8 W continuously$12.61
Running costs
Network Switch Electricity Cost per Year
Calculate network switch electricity cost per year from measured idle and port load, including PoE devices without double counting them.
worked two-system gap$10.80
Running costs
Laptop vs Desktop Electricity Cost per Month
Compare laptop vs desktop electricity cost per month using complete systems, the same workload and measured kWh instead of power-supply ratings.
40 W monthly difference$4.32
Running costs
OLED vs LED TV Electricity Cost Compared
Compare OLED vs LED TV electricity cost with equal screen size, picture mode and viewing hours using each model’s measured or labelled energy.
worked monthly gap$9.72
Running costs
Projector vs TV Electricity Cost Compared
Compare projector vs TV electricity cost for the same viewing hours while including picture size, brightness and required audio equipment.
5 W average all year$7.88
Running costs
Smart Speaker Electricity Cost per Year
Estimate smart speaker electricity cost per year from measured idle, listening and display modes without treating adapter watts as actual draw.
1,500 W for one hour$0.27
Running costs
Electric Stove Burner Cost per Hour
Calculate electric stove burner cost per hour from element watts and measured cycling, then compare completed cooking tasks rather than ratings.
0.05 kWh per task$0.009
Running costs
Kettle vs Microwave Cost to Boil Water
Compare electric kettle vs microwave cost to boil water by measuring the same water volume and final temperature, not appliance wattage alone.
worked session gap$0.11
Running costs
Air Fryer vs Toaster Oven Electricity Cost
Compare air fryer vs toaster oven electricity cost for the same food quantity and result using complete-session kWh, time and capacity.
illustrative meal gap$0.13
Running costs
Instant Pot vs Slow Cooker Electricity Cost
Compare Instant Pot vs slow cooker electricity cost for an equivalent finished meal using measured cycle kWh rather than maximum watt ratings.
0.4 kWh cycle difference$0.07
Running costs
Dishwasher Eco vs Normal Cycle Electricity Cost
Compare dishwasher eco vs normal cycle electricity cost from measured per-cycle kWh, water use and cleaning results without judging by time alone.
0.25 kWh option difference$0.05
Running costs
Dishwasher Heated Dry Cost per Cycle
Estimate dishwasher heated dry cost per cycle by comparing matched cycles with heat dry on and off while keeping hot-water energy separate.
2 kWh load difference$0.36
Running costs
Vented vs Condenser Dryer Electricity Cost
Compare vented vs condenser dryer electricity cost per completed load using measured kWh, load moisture and cycle time instead of dryer type alone.
100 kWh annual difference$18.00
Running costs
Manual vs Frost-Free Freezer Running Cost
Compare manual defrost vs frost-free freezer running cost with annual kWh labels, usable capacity and the same configuration and temperature.
worked load difference$0.36
Running costs
Dehumidifier vs Dryer Cost to Dry Clothes
Compare dehumidifier vs tumble dryer cost to dry clothes using the same laundry load, starting moisture and time-to-dry boundary.
60 W for 8 hours daily$2.59
Running costs
Tower Fan Electricity Cost per Month
Calculate tower fan electricity cost per month from measured speed, oscillation and hours, while keeping cooling comfort separate from AC.
30 W for 8 hours daily$1.30
Running costs
LED Strip Lights Electricity Cost per Month
Calculate LED strip lights electricity cost per month from actual adapter input, installed length, brightness and daily hours.
20 W for 8 hours over 30 days$0.86
Running costs
Holiday Lights Electricity Cost per Month
Calculate holiday lights electricity cost per month from total string watts, timer hours and days, comparing LED and incandescent safely.
1 W for 20 hours daily$1.31
Running costs
Smart TV Standby Cost per Year
Calculate smart TV standby cost per year from measured sleep and network-ready power without confusing standby with active viewing.
meter buying decisionkWh first
Running costs
P4400 vs P4460: which Kill A Watt meter fits your needs?
Compare P4400 and P4460 electricity meters: kWh measurement, cost display, power-loss memory and when a basic meter is enough.
P4400 buying decisionMeasure first
Running costs
Kill A Watt P4400 review: useful measurements, manual cost calculations
Our specification-based P4400 review covers kWh readings, the reset limitation, US outlet compatibility and when borrowing a meter makes more sense.
listed input per bulb8.8 W
Running costs
Philips A19 LED review: check the old bulb before buying
Review of the Philips 8.8W A19 non-dimmable four-pack: brightness, warm-white light, fixture checks and calculated costs versus incandescent or existing LED.
US P110M two-packMeasure + control
Running costs
Tapo P110M review: energy monitoring with useful limits
Is the Tapo P110M worth buying? Our US-version review covers energy tracking, Matter compatibility, load limits and a realistic standby-savings calculation.
no app workflowLocal display
Running costs
Kill A Watt EZ P4460 review: stored readings and cost estimates
Our P4460 review explains stored readings, programmed tariffs, forecast limits, US electrical compatibility and whether upgrading from a P4400 makes sense.
look beyond the purchase priceRoom + filter
Running costs
Levoit Core 300S-P review: room size, filter costs and wattage
Is the Levoit Core 300S-P worth buying? Compare room-size claims, filter costs, smart controls and conflicting wattage figures before choosing a US model.
1500 W at an example $0.18/kWh$0.27/hour
Running costs
Dreo Atom One review: useful warmth with a real running cost
Should you buy the Dreo Atom One? Read our US-model review of 1500W running costs, ECO mode, placement limits and when a small space heater makes sense.
Know before you switch on
A little clarity.
A better energy bill.
Estimate a device’s monthly running cost with your own electricity rate.
Open the full calculator →$25.92 / month
Example inputs, not a US average. Use measured average watts for appliances that cycle.