Watt Hour to Kilowatt Hour Converter
Energy · unit-converter
Convert Watt Hour to Kilowatt Hour with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: Watt Hour (wh)
To: Kilowatt Hour (kwh)
About Watt Hour
One watt-hour is 3,600 J—the energy from 1 W for one hour. Common for small batteries and device ratings.
About Kilowatt Hour
One kilowatt-hour is the energy from 1 kW of power for one hour: 1 kWh = 3,600,000 J. Utility bills and battery specs often use kWh.
How to convert watt hours to kilowatt hours
1 watt hour is equal to 0.001 kilowatt hour when both are expressed in joule-equivalents:
1 wh = (3,600 J ÷ 3,600,000 J) kwh = 0.001 kwh
Each watt hour is defined as 3,600 J and each kilowatt hour as 3,600,000 J in this tool, so one wh equals 3,600 ÷ 3,600,000 kwh = 0.001 kwh.
Let d(wh) be the numeric amount in Watt Hour (wh), and d(kwh) the amount in Kilowatt Hour (kwh). Then:
d(kwh) = d(wh) × (3,600 / 3,600,000)
Equivalently, divide by how many wh fit into one kwh (joules per kwh divided by joules per wh):
d(kwh) = d(wh) ÷ 1000
Or: kilowatt hour = watt hour ÷ 1000
Examples
Example #1: Convert 1 wh to kilowatt hour
1 wh = 1 wh × (3,600/3,600,000) kwh = 0.001 kwh
1 wh = 1 wh ÷ 1000 = 0.001 kwh
Example #2: Convert 10 wh to kilowatt hour
10 wh = 10 wh × (3,600/3,600,000) kwh = 0.01 kwh
10 wh = 10 wh ÷ 1000 = 0.01 kwh
Summary
To convert Watt Hour to Kilowatt Hour, multiply the value in wh by the ratio of joules per wh divided by joules per kwh. Equivalently: value_kwh = value_wh × (3600 / 3600000). Numerically, 1 wh equals 0.001 kwh.
Relationship context
Both units are electrical energy (watt-hours). Conversions use fixed joule factors, so results stay consistent with the definitions in this converter. The factor from Watt Hour to Kilowatt Hour is 1.000000e-3 (1 wh = 0.001 kwh).
Conversion tables
| Watt Hour (wh) | Kilowatt Hour (kwh) |
|---|---|
| 0.1 | 0.0001 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 6 | 0.006 |
| 7 | 0.007 |
| 8 | 0.008 |
| 9 | 0.009 |
| Watt Hour (wh) | Kilowatt Hour (kwh) |
|---|---|
| 10 | 0.01 |
| 20 | 0.02 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 60 | 0.06 |
| 70 | 0.07 |
| 80 | 0.08 |
| 90 | 0.09 |
| 100 | 0.1 |