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Joules to Watt-hours Converter

1 J = 0.000277778 Wh (joule → watt-hour)

1 J = 0.000277778 Wh

1 joule equals 0.000277778 watt-hours. To convert joules to watt-hours, multiply the joule value by 0.000277778. For quick reference: 1 J = 0.000277778 Wh, 5 J = 0.00138889 Wh, 10 J = 0.00277778 Wh, 100 J = 0.0277778 Wh.

0.000277778
FormulaWatt-hours = Joules × 0.000277778
Quick

How to convert joules to watt-hours

  1. Take your value

    Start with your value in joules.

  2. Multiply by 0.000277778

    Multiply the joule value by 0.000277778. This is the exact conversion factor from joules to watt-hours.

  3. Read the result

    The product is your value in watt-hours. For example, 5 J × 0.000277778 = 0.00138889 Wh.

Conversion formula

The exact factor from joules to watt-hours is 0.000277778.

Watt-hours = Joules × 0.000277778

Joules to Watt-hours conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Conversion table from joules to watt-hours
Joules (J)Watt-hours (Wh)
0.001 J2.7778 × 10^−7 Wh
0.01 J2.7778 × 10^−6 Wh
0.1 J2.7778 × 10^−5 Wh
0.5 J0.00013889 Wh
1 J0.00027778 Wh
1.5 J0.00041667 Wh
2 J0.00055556 Wh
5 J0.0013889 Wh
10 J0.0027778 Wh
20 J0.0055556 Wh
50 J0.013889 Wh
100 J0.027778 Wh
200 J0.055556 Wh
250 J0.069444 Wh
500 J0.13889 Wh
1000 J0.27778 Wh
2000 J0.55556 Wh
2500 J0.69444 Wh
3600 J1 Wh
5000 J1.3889 Wh
7500 J2.0833 Wh
10000 J2.7778 Wh
25000 J6.9444 Wh
50000 J13.889 Wh
100000 J27.778 Wh
250000 J69.444 Wh
500000 J138.89 Wh
1000000 J277.78 Wh
2000000 J555.56 Wh
3600000 J1000 Wh
5000000 J1388.9 Wh
10000000 J2777.8 Wh
25000000 J6944.4 Wh
50000000 J13889 Wh
100000000 J27778 Wh
250000000 J69444 Wh
500000000 J138889 Wh
1000000000 J277778 Wh
2000000000 J555556 Wh
5000000000 J1388889 Wh
10000000000 J2777778 Wh
20000000000 J5555556 Wh
50000000000 J13888889 Wh
100000000000 J27777778 Wh
1000000000000 J277777778 Wh
10000000000000 J2777777778 Wh
100000000000000 J27777777778 Wh
1000000000000000 J277777777778 Wh
10000000000000000 J2777777777778 Wh
100000000000000000 J27777777777778 Wh

Real-world reference

A heartbeat releases about 1 J of mechanical work. Lifting an apple 1 m takes roughly 1 J.

Frequently asked questions

How many watt-hours are in 1 joule?
1 joule equals 0.000277778 watt-hours.
How do I convert joules to watt-hours?
Multiply the joule value by 0.000277778. So x J × 0.000277778 = the equivalent in Wh.
What is 5 joules in watt-hours?
5 joules equals 0.00138889 watt-hours.
What is 10 joules in watt-hours?
10 joules equals 0.00277778 watt-hours.
What is 100 joules in watt-hours?
100 joules equals 0.0277778 watt-hours.
How do I convert back from watt-hours to joules?
Multiply the watt-hour value by 3600. For example, 1 Wh = 3600 J.
Is the joule bigger than the watt-hour?
No. 1 joule is smaller than 1 watt-hour. It takes 3600 joules to equal 1 watt-hour.
Are these conversion factors exact?
Yes. The factor of 0.000277778 is derived directly from the SI definitions of joule and watt-hour.

About the joule and the watt-hour

The joule

The joule (J) is the SI derived unit of energy, work, and heat — defined as the energy transferred when a force of one newton acts over one meter. The joule is the standard unit in physics, chemistry, and most modern engineering documentation.

The watt-hour

The watt-hour (Wh) equals 3,600 joules — the energy delivered by one watt of power over one hour. It is the natural unit for batteries, small electronics, and short-duration electrical loads.

Related converters

Watt-hours to Joules
Wh → J
Joules to Kilojoules
J → kJ
Joules to Calories
J → cal
Joules to Kilocalories
J → kcal
Joules to Kilowatt-hours
J → kWh
Kilojoules to Joules
kJ → J

Sources