Megajoule to Watt Hour Converter
Energy · unit-converter
Convert Megajoule 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: Megajoule (mj)
To: Watt Hour (wh)
About Megajoule
One megajoule is 1,000,000 J. It is common in fuel-content and engineering thermal calculations.
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 megajoules to watt hours
1 megajoule is equal to 277.77777777777777 watt hour when both are expressed in joule-equivalents:
1 mj = (1,000,000 J ÷ 3,600 J) wh = 277.77777777777777 wh
Each megajoule is defined as 1,000,000 J and each watt hour as 3,600 J in this tool, so one mj equals 1,000,000 ÷ 3,600 wh = 277.77777777777777 wh.
Let d(mj) be the numeric amount in Megajoule (mj), and d(wh) the amount in Watt Hour (wh). Then:
d(wh) = d(mj) × (1,000,000 / 3,600)
Equivalently, divide by how many mj fit into one wh (joules per wh divided by joules per mj):
d(wh) = d(mj) ÷ 0.0036
Or: watt hour = megajoule ÷ 0.0036
Examples
Example #1: Convert 1 mj to watt hour
1 mj = 1 mj × (1,000,000/3,600) wh = 277.777777778 wh
1 mj = 1 mj ÷ 0.0036 = 277.777777778 wh
Example #2: Convert 10 mj to watt hour
10 mj = 10 mj × (1,000,000/3,600) wh = 2777.77777778 wh
10 mj = 10 mj ÷ 0.0036 = 2777.77777778 wh
Summary
To convert Megajoule to Watt Hour, multiply the value in mj by the ratio of joules per mj divided by joules per wh. Equivalently: value_wh = value_mj × (1000000 / 3600). Numerically, 1 mj equals 277.77777777777777 wh.
Relationship context
You are converting between SI energy (joules) (Megajoules) and electrical energy (watt-hours) (Watt Hours). All values are mapped through joules first. The numeric factor is 2.777778e+2.
Conversion tables
| Megajoule (mj) | Watt Hour (wh) |
|---|---|
| 0.1 | 27.7777777778 |
| 1 | 277.777777778 |
| 2 | 555.555555556 |
| 3 | 833.333333333 |
| 4 | 1,111.11111111 |
| 5 | 1,388.88888889 |
| 6 | 1,666.66666667 |
| 7 | 1,944.44444444 |
| 8 | 2,222.22222222 |
| 9 | 2,500 |
| Megajoule (mj) | Watt Hour (wh) |
|---|---|
| 10 | 2,777.77777778 |
| 20 | 5,555.55555556 |
| 30 | 8,333.33333333 |
| 40 | 11,111.1111111 |
| 50 | 13,888.8888889 |
| 60 | 16,666.6666667 |
| 70 | 19,444.4444444 |
| 80 | 22,222.2222222 |
| 90 | 25,000 |
| 100 | 27,777.7777778 |