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Electrical Calculators

kWh to Joules Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
kWh
Verified formula Private

Energy in joules

3,600,000

In megajoules
3.60

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the kWh to Joules Calculator

The kWh to Joules Calculator works out your energy in joules, along with 1 related figure in an instant. Enter energy and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the energy.
  2. Read off your energy in joules, together with in megajoules — the calculator updates automatically, with no button to press.

Formula

The kWh to Joules Calculator uses the formula:

Energy in joules = Energy × 3600000

Worked example

For example, with energy of 1 kWh, the energy in joules is 3,600,000.

Inputs used
Energy 1 kWh
Results
Energy in joules 3,600,000
In megajoules 3.60

Results are estimates for educational use, not professional advice.

Frequently asked questions

One kilowatt-hour is 3,600,000 joules (3.6 megajoules), since 1 kW for 1 hour is 1000 W × 3600 s.

Joules are the SI unit of energy, useful for physics, while kWh is the practical unit for electricity bills.

Divide joules by 3,600,000. One megajoule is about 0.278 kWh.

Yes. One watt for one second is exactly one joule, the basis of the conversion.

The kWh to Joules Calculator uses the formula: Energy in joules = Energy × 3600000. For example, with energy of 1 kWh, the energy in joules is 3,600,000.

Enter the energy. Read off your energy in joules, together with in megajoules — the calculator updates automatically, with no button to press.

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