kWh Cost Calculator

Enter appliance wattage, daily usage hours, and your electricity rate to instantly see daily, monthly, and yearly running costs.

Appliance & Usage Details

W

Found on the device label or spec sheet.

hrs/day

Average hours the appliance runs each day.

$ / kWh

Check your latest electricity bill for this figure.

Common Appliance Wattages

LED Bulb8–15 W
Laptop30–70 W
Desktop PC200–400 W
Refrigerator100–400 W
Washing Machine500–1200 W
Electric Kettle1200–3000 W
Air Conditioner1000–3500 W
Electric Water Heater3000–5500 W

Click a row to pre-fill the wattage field.

Fill in the details on the left and click Calculate Cost to see your results.

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Summary

Enter appliance wattage, daily usage hours, and your electricity rate to instantly see daily, monthly, and yearly running costs.

How it works

  1. Enter the appliance wattage in watts (W) — found on the device label or spec sheet.
  2. Enter how many hours per day the appliance is typically running.
  3. Enter your electricity rate in cost per kilowatt-hour (kWh) from your utility bill.
  4. The calculator converts watts to kilowatts, multiplies by daily hours to get daily kWh consumption.
  5. Daily kWh is multiplied by your rate to produce a daily cost, then scaled to monthly (30 days) and yearly (365 days) figures.

Use cases

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu