How Much Does a Microwave Cost to Run?
Updated March 2026. Default rate effective 1 April 2026 (Ofgem Q2 2026). Figures are typical estimates rather than model-specific guarantees.
A microwave costs approximately 1.6p per use and around £12 per year to run, making it one of the most energy-efficient kitchen appliances. Despite drawing 1,000W, most microwave sessions last just 2-5 minutes.
Calculator24.5p/kWh
W
times
min
p/kWh
Per use
1.6p
Per day
3.3p
Per week
22.9p
Per month
£0.99
Annual cost
£11.92
Typical annual electricity use: 48.67 kWh
Based on typical microwave usage at current rates.
Annual estimate
£11.92
Annual electricity use
48.67 kWh
Typical household bill context
About 2% of a typical home's annual variable electricity spend at the current default rate.
What Affects the Cost of Running a Microwave?
Microwave running costs depend on: Output vs input wattage — a microwave rated at 800W output actually draws about 1,000W from the mains (roughly 20-30% higher). Duration — most uses are 2-5 minutes. Power level — lower power settings pulse the magnetron on and off. Usage frequency — the typical UK household uses the microwave about twice per day.
Helpful guides
Related appliances
Assumptions and methodology
- Electricity rate: 24.5p/kWh (Ofgem Q2 2026)
- Default wattage is based on a typical appliance in this category
- Usage assumptions are meant to be a sensible starting point, not a fixed rule
- Costs vary with tariff, model, settings, load size, and household habits
Tips to Reduce Microwave Running Costs
Use the microwave instead of the oven for reheating — it uses a fraction of the energy. Match the power level to the task: defrosting on a lower power setting uses less energy overall. Cover food with a microwave-safe lid to retain heat and cook faster.
Frequently asked questions
Common questions about electricity costs and our calculators.