Energy Converter

Convert between chemical, electrical and physical energy units.

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Related Conversions
1 J to Wh 10 J to Wh 100 J to Wh 500 J to Wh 5,000 J to Wh 25,000 J to Wh 50,000 J to Wh 56,320 J to Wh 63,360 J to Wh 77,440 J to Wh 84,480 J to Wh 100,000 J to Wh
Reverse Conversions
5 Wh to J 25 Wh to J 250 Wh to J 500 Wh to J 1,000 Wh to J 10,000 Wh to J 25,000 Wh to J 84,480 Wh to J 112,640 Wh to J 140,800 Wh to J 704,000 Wh to J 1,408,000 Wh to J
More Energy Conversions
1 MJ to BTU 100 J to cal 1 GJ to kWh 1 GJ to MJ 2 MJ to BTU 100 kJ to kcal 1 MJ to kWh 2 GJ to MJ 10 BTU to J 250 cal to J

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Popular Conversions

Kilowatt-Hours to Megajoules Megajoules to Kilowatt-Hours Joules to Calories Kilocalories to Kilojoules British Thermal Units to Joules Watt-Hours to Joules

Common Benchmarks

Gasoline liter 34 MJ
Phone battery 40 kJ
Laptop full charge 200 kJ
AA battery 10 kJ
Slice of bread 330 kJ
Cup of coffee 5 kJ

Formula

Wh = J × 0.0002777778

Example

Example: convert 70400 joules to watt-hours.

70400 J = 19.55555556 Wh

Conversion table

joules (J) watt-hours (Wh)
1 J 0.00027778 Wh
2 J 0.00055556 Wh
5 J 0.00138889 Wh
10 J 0.00277778 Wh
20 J 0.00555556 Wh
50 J 0.01388889 Wh
100 J 0.02777778 Wh

Explanation

These are both units.

How to convert joules to watt-hours

  1. Start with the value in joules (J).
  2. Multiply it by 0.0002777778.
  3. The result is the measurement in watt-hours (Wh).

Example: 70400 J → 19.55555556 Wh

Frequently Asked Questions

How much is 70400 joules in watt-hours?

70400 joules is about 19.5556 watt-hours.

How many watt-hours is 1 joule?

1 joule equals 0.000277777778 watt-hours.

How many joules is 1 watt-hour?

1 watt-hour equals 3600 joules.

What is the difference between joules and watt-hours?

Both measure energy in SI. The main difference is usually scale: some units are convenient for smaller values, while others are used to express larger values more practically.

Where are joules and watt-hours used?

They are used in physics and engineering to measure work, energy, and heat; the most practical unit depends on the magnitude.

Why does 1 joule equal 0.000277777778 watt-hours?

Because the units are defined with a fixed relationship. To convert joules to watt-hours, multiply by that factor.