Free Electricity Cost Calculator

Find the cost to run an appliance based on wattage and usage.

Electricity bills are based on kilowatt-hours (kWh) — the amount of energy a 1,000-watt device uses in one hour. Check your utility bill for your actual per-kWh rate, since it varies significantly by region and provider.

Worked Example

Example: A 1,500W space heater running 6 hours/day at $0.15/kWh: 1.5kW × 6h = 9 kWh/day × $0.15 = $1.35/day, or about $40.50/month.

Formula / Method

Energy (kWh) = Watts / 1000 × Hours Used
Cost = Energy (kWh) × Rate ($/kWh)

Worked Example

Example: A 1,500W space heater running 6 hours/day at $0.15/kWh: 1.5kW × 6h = 9 kWh/day × $0.15 = $1.35/day, or about $40.50/month.

Formula / Method

Energy (kWh) = Watts / 1000 × Hours Used
Cost = Energy (kWh) × Rate ($/kWh)