Enter any two of power, time, or energy to calculate the third, with conversions among kW/W, hours/minutes/seconds/days, and Wh/kWh/J.
kW to Wh Formula
The following formula converts power and time to energy; multiply power by time and apply unit conversions as needed.
E_{\mathrm{Wh}} = P_{\mathrm{kW}} \times 1000 \times t_{\mathrm{h}}- 1 kW = 1000 W
- 1 kWh = 1000 Wh
- 1 Wh = 3600 J
- 1 day = 24 hours
kW to Wh Conversion Table
| Power (kW) | Energy (Wh) |
|---|---|
| 0.05 | 50 |
| 0.10 | 100 |
| 0.20 | 200 |
| 0.25 | 250 |
| 0.30 | 300 |
| 0.50 | 500 |
| 0.75 | 750 |
| 1.00 | 1,000 |
| 1.25 | 1,250 |
| 1.50 | 1,500 |
| 2.00 | 2,000 |
| 2.50 | 2,500 |
| 3.00 | 3,000 |
| 4.00 | 4,000 |
| 5.00 | 5,000 |
| 7.50 | 7,500 |
| 10.00 | 10,000 |
| * For 1 hour: Energy (Wh) = Power (kW) × 1000. | |
How do you convert kW to Wh? Multiply power (kW) by time (hours) and by 1000 to get watt-hours: Wh = kW × h × 1000; if power is in watts, use Wh = W × h.
How do you convert Wh to kW? Divide energy by time and by 1000: kW = Wh ÷ (h × 1000); if you want kWh, simply divide Wh by 1000.
Example Problem
Convert 2.5 kW used for 3 hours to Wh.
Use the formula: Wh = kW × h × 1000.
Wh = 2.5 × 3 × 1000 = 7,500 Wh (which is 7.5 kWh)
