Where do I find an appliance's wattage?

Check the label on the device or its power supply, usually near the plug.

What's a typical $/kWh rate?

US national average is around 16¢/kWh in 2025, but it ranges from 10¢ to 35¢+ by state.

Yes — 'phantom load' from idle electronics is 5–10% of most homes' bills.

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How much is that space heater really costing you? Plug in the wattage, hours used, and your rate to find out.

Appliance wattage(W)

Hours per day

Days per month

Electricity rate($/kWh)

$/kWh

Result will appear here

kWh = (watts ÷ 1000) × hours × days; cost = kWh × rate

Where do I find an appliance's wattage?
Check the label on the device or its power supply, usually near the plug.
What's a typical $/kWh rate?
US national average is around 16¢/kWh in 2025, but it ranges from 10¢ to 35¢+ by state.
Does standby power matter?
Yes — 'phantom load' from idle electronics is 5–10% of most homes' bills.