Microwave Vs Oven Running Costs
Assumptions: 1,000W microwave for 5 minutes versus 2,200W oven for 30-60 minutes.
| Scenario | Microwave | Electric oven | Likely better choice |
|---|---|---|---|
| Reheat meal | 2p | 27p-54p | Microwave |
| Crisp or roast | May be unsuitable | Better result | Oven |
| Large tray | Multiple batches | One session | Depends |
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.