Kilowatt Hour to Watt Hour Converter
Energy · unit-converter
Convert Kilowatt Hour to Watt 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: Kilowatt Hour (kwh)
To: Watt Hour (wh)
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.
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.
How to convert kilowatt hours to watt hours
1 kilowatt hour is equal to 1000 watt hour when both are expressed in joule-equivalents:
1 kwh = (3,600,000 J ÷ 3,600 J) wh = 1000 wh
Each kilowatt hour is defined as 3,600,000 J and each watt hour as 3,600 J in this tool, so one kwh equals 3,600,000 ÷ 3,600 wh = 1000 wh.
Let d(kwh) be the numeric amount in Kilowatt Hour (kwh), and d(wh) the amount in Watt Hour (wh). Then:
d(wh) = d(kwh) × (3,600,000 / 3,600)
Equivalently, divide by how many kwh fit into one wh (joules per wh divided by joules per kwh):
d(wh) = d(kwh) ÷ 0.001
Or: watt hour = kilowatt hour ÷ 0.001
Examples
Example #1: Convert 1 kwh to watt hour
1 kwh = 1 kwh × (3,600,000/3,600) wh = 1000 wh
1 kwh = 1 kwh ÷ 0.001 = 1000 wh
Example #2: Convert 10 kwh to watt hour
10 kwh = 10 kwh × (3,600,000/3,600) wh = 10000 wh
10 kwh = 10 kwh ÷ 0.001 = 10000 wh
Summary
To convert Kilowatt Hour to Watt Hour, multiply the value in kwh by the ratio of joules per kwh divided by joules per wh. Equivalently: value_wh = value_kwh × (3600000 / 3600). Numerically, 1 kwh equals 1000 wh.
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 Kilowatt Hour to Watt Hour is 1.000000e+3 (1 kwh = 1000 wh).
Conversion tables
| Kilowatt Hour (kwh) | Watt Hour (wh) |
|---|---|
| 0.1 | 100 |
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 4 | 4,000 |
| 5 | 5,000 |
| 6 | 6,000 |
| 7 | 7,000 |
| 8 | 8,000 |
| 9 | 9,000 |
| Kilowatt Hour (kwh) | Watt Hour (wh) |
|---|---|
| 10 | 10,000 |
| 20 | 20,000 |
| 30 | 30,000 |
| 40 | 40,000 |
| 50 | 50,000 |
| 60 | 60,000 |
| 70 | 70,000 |
| 80 | 80,000 |
| 90 | 90,000 |
| 100 | 100,000 |