Count seconds of motor use separately
An adjustable desk motor operates for seconds, not hours. Record the wattage or measured average while moving, seconds per move, moves per workday and workdays per year. Convert watt-seconds to kWh by dividing by 3,600,000.
For 250 W, 15 seconds, eight moves and 250 days: 250 × 15 × 8 × 250 ÷ 3,600,000 = about 2.08 kWh per year. This is an illustrative movement schedule, not a model specification. Load, height change and motor design can change the reading.
Add standby across the remaining hours
The controller may remain energized between moves. If measured standby is 0.2 W, subtract annual motor time from 8,760 hours only when precision matters; using 0.2 W × 8,760 ÷ 1,000 gives 1.752 kWh as a close ceiling. Movement plus standby is about 3.83 kWh, or $0.69 at $0.18/kWh.
Do not add 24 hours of standby to a whole-outlet measurement that already includes both modes. If a meter records the desk for seven complete days, project that total directly while noting whether it was a normal workweek.
| Movement energy | Standby average | Approx. annual energy | Cost at $0.18/kWh |
|---|---|---|---|
| 1.0 kWh | 0.1 W | 1.88 kWh | $0.34 |
| 2.08 kWh | 0.2 W | 3.83 kWh | $0.69 |
| 4.0 kWh | 1.0 W | 12.76 kWh | $2.30 |
Keep USB charging outside the motor claim
Some desks include USB ports, wireless charging or accessories. Measure those together only if you want a whole-desk system cost. A phone charged from the desk should not be described as motor energy. Record which accessories were connected during a standby test.
A desk power strip, computer and monitors are separate home-office loads. Add them in a system total without double counting the desk outlet.
Do not trade required function for pennies
Use the controls and safety features as intended, keep cables routed for the full movement range and follow load limits. Do not disconnect the controller in a way that defeats required memory, collision detection or other supported functions.
The annual calculation is most useful for understanding scale and comparing controllers with published or measured standby. Ergonomics, stability, warranty and fit remain separate purchase questions.
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Sources & further reading
Numerical examples are illustrative unless explicitly described as measured. This guide does not claim hands-on product testing. Read the methodology and editorial disclosure.