Kilojoule to Watt Hour Converter
Energy · unit-converter
Convert Kilojoule 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: Kilojoule (kj)
To: Watt Hour (wh)
About Kilojoule
One kilojoule is 1,000 J. Scientific and engineering contexts often use kJ alongside joules.
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 kilojoules to watt hours
1 kilojoule is equal to 0.27777777777778 watt hour when both are expressed in joule-equivalents:
1 kj = (1,000 J ÷ 3,600 J) wh = 0.27777777777778 wh
Each kilojoule is defined as 1,000 J and each watt hour as 3,600 J in this tool, so one kj equals 1,000 ÷ 3,600 wh = 0.27777777777778 wh.
Let d(kj) be the numeric amount in Kilojoule (kj), and d(wh) the amount in Watt Hour (wh). Then:
d(wh) = d(kj) × (1,000 / 3,600)
Equivalently, divide by how many kj fit into one wh (joules per wh divided by joules per kj):
d(wh) = d(kj) ÷ 3.6
Or: watt hour = kilojoule ÷ 3.6
Examples
Example #1: Convert 1 kj to watt hour
1 kj = 1 kj × (1,000/3,600) wh = 0.2777777778 wh
1 kj = 1 kj ÷ 3.6 = 0.2777777778 wh
Example #2: Convert 10 kj to watt hour
10 kj = 10 kj × (1,000/3,600) wh = 2.7777777778 wh
10 kj = 10 kj ÷ 3.6 = 2.7777777778 wh
Summary
To convert Kilojoule to Watt Hour, multiply the value in kj by the ratio of joules per kj divided by joules per wh. Equivalently: value_wh = value_kj × (1000 / 3600). Numerically, 1 kj equals 0.2777777777777778 wh.
Relationship context
You are converting between SI energy (joules) (Kilojoules) and electrical energy (watt-hours) (Watt Hours). All values are mapped through joules first. The numeric factor is 2.777778e-1.
Conversion tables
| Kilojoule (kj) | Watt Hour (wh) |
|---|---|
| 0.1 | 0.0277777778 |
| 1 | 0.2777777778 |
| 2 | 0.5555555556 |
| 3 | 0.8333333333 |
| 4 | 1.1111111111 |
| 5 | 1.3888888889 |
| 6 | 1.6666666667 |
| 7 | 1.9444444444 |
| 8 | 2.2222222222 |
| 9 | 2.5 |
| Kilojoule (kj) | Watt Hour (wh) |
|---|---|
| 10 | 2.7777777778 |
| 20 | 5.5555555556 |
| 30 | 8.3333333333 |
| 40 | 11.1111111111 |
| 50 | 13.8888888889 |
| 60 | 16.6666666667 |
| 70 | 19.4444444444 |
| 80 | 22.2222222222 |
| 90 | 25 |
| 100 | 27.7777777778 |