Electricity Cost Calculator — Formula
## How to Calculate Electricity Cost
Convert wattage to kilowatts, multiply by usage hours to get kWh, then multiply by your utility rate.
### Formula
**Daily kWh = Wattage / 1000 x Hours Per Day**
**Daily Cost = kWh x Rate Per kWh**
Convert wattage to kilowatts, multiply by usage hours to get kWh, then multiply by your utility rate.
### Formula
**Daily kWh = Wattage / 1000 x Hours Per Day**
**Daily Cost = kWh x Rate Per kWh**
Exemplo Resolvido
A 1,500W space heater running 4 hours/day at $0.14/kWh.
- Daily kWh = 1,500 / 1,000 x 4 = 6.0 kWh
- Daily cost = 6.0 x $0.14 = $0.84
- Monthly cost = $0.84 x 30 = $25.20
- Annual cost = $0.84 x 365 = $306.60