Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Kilowatt-Hours to Megajoules Converter (kWh to MJ)
Kilowatt-hours
kWh → MJ
3.6 MJ
10 kWh → 36 MJ. 0.5 kWh dryer cycle → 1.8 MJ.
- You typed
- 1 kWh
- One MJ is
- 0.278 kWh
- How it’s calculated
- MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.
Kilowatt-hours to Megajoules conversion table
Common kWh values in MJ. Same factor as the converter above: MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.
| Kilowatt-hours | Megajoules |
|---|---|
| 0.25 kWh | 0.9 MJ |
| 0.5 kWh | 1.8 MJ |
| 1 kWh | 3.6 MJ |
| 2 kWh | 7.2 MJ |
| 5 kWh | 18 MJ |
| 10 kWh | 36 MJ |
| 20 kWh | 72 MJ |
| 25 kWh | 90 MJ |
| 30 kWh | 108 MJ |
| 50 kWh | 180 MJ |
| 100 kWh | 360 MJ |
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Kilowatt-hours
The “Kilowatt-hours” value used in this tool’s formula. Adjust it to see results update live.
MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.
Your electric bill is in kWh. Physics problems want joules. 1 kWh = 3.6 MJ exactly (1,000 W × 3,600 s). A 30 kWh EV pack is 108 MJ. That is energy stored, not how far you will get in the rain.
How this calculator works
Your electric bill is in kWh. Physics problems want joules. 1 kWh = 3.6 MJ exactly (1,000 W × 3,600 s). A 30 kWh EV pack is 108 MJ. That is energy stored, not how far you will get in the rain. MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J. Scenario: 10 kWh → 36 MJ. 0.5 kWh dryer cycle → 1.8 MJ.
MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.
Scenario: 10 kWh → 36 MJ. 0.5 kWh dryer cycle → 1.8 MJ.
When to use this kWh to Megajoules
Common use cases
- Your electric bill is in kWh. Physics problems want joules. 1 kWh = 3.6 MJ exactly (1,000 W × 3,600 s). A 30 kWh EV pack is 108 MJ. That is energy stored, not how far you will get in the rain.
- Sanity-check with this scenario: 10 kWh → 36 MJ. 0.5 kWh dryer cycle → 1.8 MJ.
- The relationship is: MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Kilowatt-hours
- MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.
- Scenario on the page: 10 kWh → 36 MJ. 0.5 kWh dryer cycle → 1.8 MJ.
How to Convert kWh to Megajoules
- 1Enter Kilowatt-hours. Use the values you have, not a catalog average, unless that is all you know.
- 2MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.
- 3Scenario: 10 kWh → 36 MJ. 0.5 kWh dryer cycle → 1.8 MJ.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.
10 kWh → 36 MJ. 0.5 kWh dryer cycle → 1.8 MJ.
10 kWh → 36 MJ. 0.5 kWh dryer cycle → 1.8 MJ.
Variable definitions
- value
Kilowatt-hours
The “Kilowatt-hours” field. Default 1; typical range 0–100000.
- The conversion (MJ = kWh × 3.6. 1 kWh = 3.6 × 10⁶ J.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
kW is power. kWh is energy. This page is energy.
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- Watts and Hours to kWhkWh = watts × hours / 1,000. A 60 W bulb for 5 hours is 0.3 kWh. Nameplate watts on a fridge are not the same as the compressor’s duty cycle.
- Acres to HectaresUS farm ads in acres, EU paperwork in hectares. Divide acres by 2.471. Ten acres is 4.05 ha. A 160-acre quarter-section is 64.7 ha.
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4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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