Joule to Watt Hour Converter
Energy · unit-converter
Convert Joule 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: Joule (j)
To: Watt Hour (wh)
About Joule
The joule is the SI unit of energy. All other units here are converted through fixed joule equivalents.
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 joules to watt hours
1 joule is equal to 0.00027777777778 watt hour when both are expressed in joule-equivalents:
1 j = (1 J ÷ 3,600 J) wh = 0.00027777777778 wh
Each joule is defined as 1 J and each watt hour as 3,600 J in this tool, so one j equals 1 ÷ 3,600 wh = 0.00027777777778 wh.
Let d(j) be the numeric amount in Joule (j), and d(wh) the amount in Watt Hour (wh). Then:
d(wh) = d(j) × (1 / 3,600)
Equivalently, divide by how many j fit into one wh (joules per wh divided by joules per j):
d(wh) = d(j) ÷ 3600
Or: watt hour = joule ÷ 3600
Examples
Example #1: Convert 1 j to watt hour
1 j = 1 j × (1/3,600) wh = 0.0002777778 wh
1 j = 1 j ÷ 3600 = 0.0002777778 wh
Example #2: Convert 10 j to watt hour
10 j = 10 j × (1/3,600) wh = 0.0027777778 wh
10 j = 10 j ÷ 3600 = 0.0027777778 wh
Summary
To convert Joule to Watt Hour, multiply the value in j by the ratio of joules per j divided by joules per wh. Equivalently: value_wh = value_j × (1 / 3600). Numerically, 1 j equals 0.0002777777777777778 wh.
Relationship context
You are converting between SI energy (joules) (Joules) and electrical energy (watt-hours) (Watt Hours). All values are mapped through joules first. The numeric factor is 2.777778e-4.
Conversion tables
| Joule (j) | Watt Hour (wh) |
|---|---|
| 0.1 | 0.0000277778 |
| 1 | 0.0002777778 |
| 2 | 0.0005555556 |
| 3 | 0.0008333333 |
| 4 | 0.0011111111 |
| 5 | 0.0013888889 |
| 6 | 0.0016666667 |
| 7 | 0.0019444444 |
| 8 | 0.0022222222 |
| 9 | 0.0025 |
| Joule (j) | Watt Hour (wh) |
|---|---|
| 10 | 0.0027777778 |
| 20 | 0.0055555556 |
| 30 | 0.0083333333 |
| 40 | 0.0111111111 |
| 50 | 0.0138888889 |
| 60 | 0.0166666667 |
| 70 | 0.0194444444 |
| 80 | 0.0222222222 |
| 90 | 0.025 |
| 100 | 0.0277777778 |