Wh to kWh converter
1 kWh equals 1,000 Wh. Divide watt-hours by 1,000 to get kilowatt-hours. This is an energy-unit conversion, so you do not need battery voltage.
1,000 Wh equals 1 kWh.
1,000 Wh
The same quantity in your chosen unit
1,000 ÷ 1,000 = 1 kWh
- Wh
- 1,000
- kWh
- 1
These values describe the same quantity without a voltage assumption. Results are rounded for display; reversing uses full precision.
Compare two battery labelsDifferent voltages? Compare watt-hours, not just mAh.
Understand the conversion
Reading battery energy in Wh and kWh
Wh and kWh both measure energy. Portable battery labels may use Wh while larger battery systems use kWh. A 2,048 Wh rating is 2.048 kWh; the unit change leaves the energy unchanged.
Keep the h when copying a rating. W and kW measure power, while Wh and kWh include time. A steady 100 W load uses 1,000 Wh, or 1 kWh, over ten hours.
Formula and worked example
kWh = Wh ÷ 1,000
Wh = kWh × 1,000
2,048 Wh ÷ 1,000 = 2.048 kWh. Reversing gives 2.048 kWh × 1,000 = 2,048 Wh.
Unit reference: NIST conversion factors lists ampere-hours under electric charge and watt-hours under energy. The battery calculations here use nominal label voltage.
Wh to kWh conversion table
Voltage does not affect these conversions. This reference table stays fixed while you edit the calculator.
| Wh | kWh |
|---|---|
| 37 | 0.037 |
| 74 | 0.074 |
| 100 | 0.1 |
| 500 | 0.5 |
| 1,000 | 1 |
| 2,048 | 2.048 |
| 5,120 | 5.12 |
| 10,000 | 10 |
Common questions
How many Wh are in 1 kWh?
Exactly 1,000 Wh. A 5.12 kWh battery has a nominal energy rating of 5,120 Wh.
Is a 1 kWh battery the same as a 1 kW battery?
Those ratings describe different things. A 1 kWh rating is an amount of energy. A 1 kW output rating describes how quickly the battery system can supply energy. Runtime also depends on usable capacity and losses.
Does this calculate charging cost?
It only converts energy units. A charging-cost estimate also needs your electricity price and the energy drawn from the outlet, which includes charging losses.