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Watt Meter Calculator

Estimate how much electricity a device uses and what it costs to run for 24 hours, 1 month, and 1 year using wattage, daily usage, and your utility rate.

W
Hours per day8 hr
$/kWh

Gaming PC

24 hours

$0.58

3.6 kWh

1 month

$17.28

108 kWh over 30 days

1 year

$210.24

1,314 kWh over 365 days

kWh = watts × qty × hours ÷ 1000. Assumes 30-day months, 365-day years.