Microwave Vs Oven Running Costs

Assumptions: 1,000W microwave for 5 minutes versus 2,200W oven for 30-60 minutes.

Cost and use-case comparison
ScenarioMicrowaveElectric ovenLikely better choice
Reheat meal2p27p-54pMicrowave
Crisp or roastMay be unsuitableBetter resultOven
Large trayMultiple batchesOne sessionDepends

Cost comparison

Microwaves are efficient for heating water-rich food directly.

When each option wins

Ovens are better for browning, baking and large trays.

What can change the result

For leftovers, the microwave usually has a large cost advantage.

FAQs

Is a microwave always cheaper?

For reheating, usually yes.

Why is the difference so large?

The microwave runs for minutes and does not heat a large cavity.

What about air fryers?

They sit between microwaves and ovens for many foods.

Does cooking output matter?

Use input wattage for cost estimates.

Last reviewed 3 May 2026. Source: Ofgem energy price cap. Figures are estimates. Actual prices vary by region, supplier, tariff, payment method and meter type.