How Much Electricity Does a Microwave Use?

How much electricity does a microwave use? The unit only runs for a few minutes a day, not continuously, so despite drawing more power at any given moment than several other kitchen appliances, its actual monthly cost stays very low. A microwave rated at 900W cooking power draws roughly 1,400 watts from the wall while running, but if you only use it for 20 minutes a day for reheating and defrosting, its addition to a monthly DEWA bill typically stays at just a few dirhams.

The quick answer

A microwave is one of the cheapest appliances in the house to run despite its high instantaneous wattage, because it only operates for a few minutes a day. Typical daily use for reheating and defrosting (10 to 20 minutes a day) consumes well under half a kWh daily, and even heavy use rarely exceeds one kWh. Compare that to an AC unit using several kWh a day, and it’s clear a microwave isn’t worth worrying about unless you run the grill or convection function for long stretches, often.

Key points

• The cooking power printed on a microwave isn’t the same as its actual electrical draw. The magnetron doesn’t convert all the incoming electricity into cooking energy, so a microwave rated at 900W cooking power draws roughly 1,400 watts from the wall (background on how a microwave works from US FDA).
• Runtime is the deciding factor in monthly cost, not wattage alone. Consumption is measured in kWh over a billing period, and that’s the unit that actually shows up on an electricity bill (kilowatt-hour definition from US EIA).
• A grill or convection function noticeably raises instantaneous draw, since it adds a resistive heating element working alongside the magnetron, though solo units remain far more common on Amazon.ae.
• Standby draw from the clock and display is small, typically well under a dirham a month, and isn’t worth worrying about next to actual cooking usage.
• DEWA’s Dubai residential tariff is tiered in slabs, starting around 23 fils per kWh in the lowest slab and rising as a home’s total usage climbs (slab tariff on DEWA’s site).

How many watts a microwave actually uses

The number printed on a microwave’s front panel or spec sheet, like 700W, 900W, or 1,100W, is its “cooking power,” meaning the energy that actually reaches the food. But the unit draws more than that from the wall, because the magnetron that generates the microwaves doesn’t convert all the incoming electricity into cooking energy, with some lost as heat. Roughly:

• 700W cooking power units (common in this market) actually draw around 1,100 to 1,200 watts from the wall.
• 900W cooking power units actually draw around 1,400 watts.
• 1,100W cooking power units, the strongest in this market, can reach 1,600 watts or more.

These are rough figures that vary a little by model, but they explain why a microwave looks “high” on instantaneous draw compared to a smaller appliance like a coffee machine or a blender, even though its actual monthly cost stays quite small, as the table below shows.

Working out the monthly cost on a DEWA bill

Since a microwave only draws power while it’s actively cooking, the monthly cost depends on the total minutes the unit runs each day, not on leaving it plugged in. Assuming an average actual draw of roughly 1,400 watts while running, and DEWA’s effective tariff approaching 30 fils per kWh for many homes once the monthly fuel surcharge is added:

These are illustrative estimates, and even the heavy-use pattern stays far below the running cost of an AC unit or an electric kettle, because the core difference is that a microwave operates in minutes, not hours.

What actually raises consumption

Since the gap between a low-cost microwave habit and a slightly higher one comes down to specific details, here are the factors actually worth your attention:

1. Using the grill or convection function instead of solo: this adds a resistive heating element working alongside the magnetron, so instantaneous draw rises noticeably during browning, though these units are relatively scarce in the UAE market compared to solo microwaves.
2. Longer cook times for bigger portions: reheating a large dish or several plates at once extends actual runtime, which raises daily kWh more than it raises instantaneous wattage.
3. Choosing a higher cooking power than you need: a 1,100W unit heats faster than a 700W one but draws more watts at any given moment, so if your daily use is simple, like heating a cup of milk or a single plate, a moderate cooking power is usually enough.
4. Standby draw adding up across several appliances: a microwave’s clock and display pull a small, constant amount on their own, but it adds to the standby draw of other kitchen appliances running in the same home.

A unit that balances performance with reasonable consumption

If you’re shopping for a microwave that won’t weigh on your bill, the practical criteria are a solo unit with a moderate cooking power that covers normal daily use without paying for more power than you need or a grill function you’ll rarely use. A practical example from our shortlist: the Samsung Solo Microwave 23L at roughly 403 AED, a fully solo unit (reheat, defrost, cook by microwave energy alone, with no extra heating element pushing up consumption), which is why it tops our guide to the best microwave in the UAE. We didn’t pick it for being the lowest-consumption unit specifically, but because its clear solo function means you’re not paying for extra heating power or a grill feature you won’t actually use most days.

See the Samsung Solo Microwave 23L price on Amazon.ae ↗

Bottom line

A microwave is one of the cheapest appliances in the house to run despite its high instantaneous wattage, because it only operates for a few minutes a day rather than hours: typical use for reheating and defrosting adds just a few dirhams to a monthly DEWA bill, and even heavy use rarely tops ten dirhams. What actually raises consumption is running the grill or convection function often, long cook times for large portions, or choosing a unit far more powerful than you need. If you’re still weighing a solo unit against a grill model, see our solo vs grill microwave guide, and for the full buying criteria read how to choose a microwave. To compare prices by category, see microwave prices in the UAE, and for the full lineup browse microwaves in the UAE.

Sources

• US FDA, “Microwave ovens”, background on how a microwave and its magnetron convert electricity into cooking energy: https://www.fda.gov/radiation-emitting-products/resources-you-radiation-emitting-products/microwave-ovens
• US EIA, “Measuring electricity in kilowatt-hours”, definition of the unit of electricity consumption used on power bills: https://www.eia.gov/energyexplained/electricity/measuring-electricity.php
• Dubai Electricity and Water Authority (DEWA), slab-based consumption tariff used for the monthly cost estimate: https://dewa.gov.ae/en/consumer/billing/slab-tariff