Watt Hour to Megajoule Converter
Energy · unit-converter
Convert Watt Hour to Megajoule 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: Megajoule (mj)
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 Megajoule
One megajoule is 1,000,000 J. It is common in fuel-content and engineering thermal calculations.
How to convert watt hours to megajoules
1 watt hour is equal to 0.0036 megajoule when both are expressed in joule-equivalents:
1 wh = (3,600 J ÷ 1,000,000 J) mj = 0.0036 mj
Each watt hour is defined as 3,600 J and each megajoule as 1,000,000 J in this tool, so one wh equals 3,600 ÷ 1,000,000 mj = 0.0036 mj.
Let d(wh) be the numeric amount in Watt Hour (wh), and d(mj) the amount in Megajoule (mj). Then:
d(mj) = d(wh) × (3,600 / 1,000,000)
Equivalently, divide by how many wh fit into one mj (joules per mj divided by joules per wh):
d(mj) = d(wh) ÷ 277.77777777777777
Or: megajoule = watt hour ÷ 277.77777777777777
Examples
Example #1: Convert 1 wh to megajoule
1 wh = 1 wh × (3,600/1,000,000) mj = 0.0036 mj
1 wh = 1 wh ÷ 277.77777777777777 = 0.0036 mj
Example #2: Convert 10 wh to megajoule
10 wh = 10 wh × (3,600/1,000,000) mj = 0.036 mj
10 wh = 10 wh ÷ 277.77777777777777 = 0.036 mj
Summary
To convert Watt Hour to Megajoule, multiply the value in wh by the ratio of joules per wh divided by joules per mj. Equivalently: value_mj = value_wh × (3600 / 1000000). Numerically, 1 wh equals 0.0036 mj.
Relationship context
You are converting between electrical energy (watt-hours) (Watt Hours) and SI energy (joules) (Megajoules). All values are mapped through joules first. The numeric factor is 3.600000e-3.
Conversion tables
| Watt Hour (wh) | Megajoule (mj) |
|---|---|
| 0.1 | 0.00036 |
| 1 | 0.0036 |
| 2 | 0.0072 |
| 3 | 0.0108 |
| 4 | 0.0144 |
| 5 | 0.018 |
| 6 | 0.0216 |
| 7 | 0.0252 |
| 8 | 0.0288 |
| 9 | 0.0324 |
| Watt Hour (wh) | Megajoule (mj) |
|---|---|
| 10 | 0.036 |
| 20 | 0.072 |
| 30 | 0.108 |
| 40 | 0.144 |
| 50 | 0.18 |
| 60 | 0.216 |
| 70 | 0.252 |
| 80 | 0.288 |
| 90 | 0.324 |
| 100 | 0.36 |