Convert megajoules to Wh
megajoules to watt hours. Enter a value to convert, or use the megajoules to Wh chart further down the page.
1 megajoule equals 277.778 watt hours. Going the other way, 1 watt hour = 0.0036 megajoules.
How to convert megajoules to Wh
To convert megajoules to watt hours, multiply the megajoule value by 277.7777778. You can also divide by 0.0036 to get the same answer.
Wh = MJ × 277.7777778
Worked example
Convert 15 MJ to watt hours:
15 MJ = 4,166.67 Wh
megajoules to Wh conversion chart
Use this megajoules to Wh table for quick reference without typing anything.
| megajoules (MJ) | watt hours (Wh) |
|---|---|
| 0.01 MJ | 2.77778 Wh |
| 0.1 MJ | 27.7778 Wh |
| 1 MJ | 277.778 Wh |
| 2 MJ | 555.556 Wh |
| 3 MJ | 833.333 Wh |
| 5 MJ | 1,388.89 Wh |
| 10 MJ | 2,777.78 Wh |
| 20 MJ | 5,555.56 Wh |
| 50 MJ | 13,888.9 Wh |
| 100 MJ | 27,777.8 Wh |
| 1,000 MJ | 277,778 Wh |
What is a megajoule?
The megajoule (MJ) is a unit of energy equal to 1000000 joules.
What is a watt hour?
A watt hour is exactly 3,600 joules — the energy used by a one-watt device in one hour. Battery capacity is rated in watt hours.
Frequently asked questions
How many Wh are in a megajoule?
1 megajoules equals 277.778 Wh. Going the other way, 1 Wh is 0.0036 megajoules.
How do you convert megajoules to Wh?
To convert megajoules to watt hours, multiply the megajoule value by 277.7777778. You can also divide by 0.0036 to get the same answer.
What is 10 megajoules in Wh?
10 megajoules equals 2,777.78 Wh. The conversion chart on this page lists the other values people look up most often.
Related energy conversions
Convert megajoules to other units
Convert other units to Wh
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