The useful answerElectric oven running cost should cover the complete session. A hypothetical 15-minute preheat averaging 2,400 W plus 45 minutes of cooking averaging 1,500 W uses 1.725 kWh and costs about $0.31 at $0.18/kWh. Add other heated stages separately.

Split the session into stages

Record cold-start preheat, heated waiting, active cooking and any additional batches. Oven elements cycle, so the maximum element rating multiplied by the entire session can exaggerate actual energy. Use measured circuit data, model information or clearly labeled assumptions.

A built-in or high-voltage oven is not suitable for an ordinary plug-in meter. Do not modify wiring to obtain a reading.

If the appliance or an installed home-energy system reports kWh, note the exact interval and other loads included. A whole-home increase during dinner may also contain the cooktop, microwave, dishwasher or ventilation, so avoid assigning every kWh to the oven.

Calculate a complete example

Assume preheat averages 2,400 W for 15 minutes: 0.60 kWh. Cooking averages 1,500 W for 45 minutes: 1.125 kWh. Together they use 1.725 kWh and cost about $0.31 at $0.18/kWh.

If another 20 minutes of heated waiting averages 900 W, it adds 0.30 kWh and about $0.05. A second tray that extends cooking should be calculated as its own stage rather than covered by a vague percentage.

To estimate a month, group meals with similar timing and multiply each group separately. One roast, several short baking sessions and a weekly batch cook do not share the same average. This approach also reveals whether reducing heated waiting has a meaningful budget effect.

Compare equal meals

An air fryer, toaster oven or countertop cooker may preheat differently and may require several batches. Compare the energy for the same amount of finished food at the required result, including every preheat and batch.

ENERGY STAR now covers certain electric cooking products, but product categories and criteria matter. Check whether the exact appliance type and model are included rather than attaching the label’s claims to an unrelated standalone oven.

Use timing changes carefully

Preparing ingredients before starting can reduce heated waiting, while batch cooking can spread one preheat across more portions. Follow food-safety and recipe instructions; an energy estimate is not a reason to use unsuitable temperatures or times.

Keep a short meal log with start time, stages and portions. Cost per serving can be more useful than cost per minute when comparing how your household actually cooks.

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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.