Watts to kWh calculator
Watts measure how fast energy is used; kilowatt-hours measure how much. Enter the wattage and running time.
VC-15 energyW × h ÷ 1000
W
h
¢/kWh
Energy per day0.5kWh
Per month 15 kWhPer year 183 kWhCost/month $2.73
Watts vs kilowatt-hours
A watt is a rate: how fast a device uses energy right now. A kilowatt-hour is an amount: 1,000 watts running for one hour. Your utility bills in kWh.
kWh = watts × hours ÷ 1000| Watts | 1 h | 8 h | 24 h | 30 days × 8 h |
|---|---|---|---|---|
| 10 W | 0.01 | 0.08 | 0.24 | 2.4 |
| 60 W | 0.06 | 0.48 | 1.44 | 14.4 |
| 100 W | 0.1 | 0.8 | 2.4 | 24 |
| 500 W | 0.5 | 4 | 12 | 120 |
| 1,000 W | 1 | 8 | 24 | 240 |
| 1,500 W | 1.5 | 12 | 36 | 360 |
| 3,000 W | 3 | 24 | 72 | 720 |
Energy in kWh.
Questions people ask
How do I convert watts to kWh?
kWh = watts × hours ÷ 1000. A 100 W TV on 5 hours a day uses 0.5 kWh per day, about 15 kWh a month.
How many kWh does a 1500 W heater use?
1.5 kWh for every hour it runs at full power. Thermostat cycling usually makes the real figure lower.