🔌 Appliance Electricity Cost Calculator

Enter an appliance's wattage and usage hours to quickly calculate daily, monthly (30-day), and yearly electricity costs. Pick a country to auto-fill a representative rate, or override it with your own.

Daily Energy Use (kWh)

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Daily Cost: — Monthly Cost (30 days): — Yearly Cost (365 days): —

GUIDE

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How the Calculation Works (kWh Formula)

Electricity billing is based on kWh (kilowatt-hours).

kWh = Wattage(W) × Hours Used(h) ÷ 1,000

Example: A 1,500W appliance used 3 hours a day
kWh/day = 1,500 × 3 ÷ 1,000 = 4.5 kWh
Daily cost = 4.5 kWh × ₩150 = ₩675
Monthly cost (30 days) = ₩675 × 30 = ₩20,250
Yearly cost (365 days) = ₩675 × 365 = ₩246,375

Reference Electricity Rates by Country

Country	Reference Rate
South Korea	~₩150/kWh
United States	~$0.19/kWh
Japan	~¥31/kWh
Germany	~€0.37/kWh
United Kingdom	~£0.26/kWh
China	~¥0.62/kWh

⚠️ South Korea uses a progressive (tiered) residential rate structure where the price per kWh rises in three tiers as usage increases; the figure above is a simplified flat-rate average across tiers, not your exact bill. Rates for other countries vary widely by utility provider, plan, and region — the table shows an approximate representative average, not a live market rate. Check your local utility's current rate schedule for exact figures.

Tips to Save on Electricity Costs

• Fully power off appliances you're not using and cut standby power with a switched power strip.
• Upgrading to a high energy-efficiency rated appliance can meaningfully cut long-term costs.
• For always-on appliances like refrigerators and A/C units, setting a moderate temperature reduces consumption.
• In tiered-pricing regions like Korea, spread out usage to avoid crossing into a higher rate tier.
• Actual draw can differ from the rated wattage on the label — for the most accurate estimate, measure real usage with a plug-in power meter.

Looking for computer, laptop, or monitor costs specifically? Try the Computer Electricity Cost Calculator, which accounts for individual PC component power draw.

Frequently asked questions

Why does Korea use tiered (progressive) electricity pricing?

Korean residential electricity rates rise in tiers as monthly usage increases, to encourage conservation. The Korea preset here (~₩150/kWh) is a simplified flat average across those tiers — your actual bill depends on which usage tier you fall into.

Can my actual bill differ from this estimate?

Yes. This calculator gives a simple estimate based on the wattage, hours, and rate you enter. Real bills can vary due to tiered pricing, additional fees (fuel cost adjustments, climate/environment charges), seasonal rate changes, and combined usage with other appliances.

Where do I find an appliance's wattage?

Check the rating label on the back or bottom of the device, or the manufacturer's spec sheet. Actual power draw during use can be lower than the rated value, so for precise numbers a plug-in power meter is recommended.

Does selecting a country automatically update the rate?

Yes. Choosing a country fills in a representative reference rate, which you can still edit to match your actual utility plan. These presets are fixed reference values, not live rates.