Energy Converter

Convert Joule to Watt-hour.

Input the value of joules below to convert instantly to watt-hours with standard conversions, definitions, and equations.

Energy Converter

Value in Watt-hours = Value in Joules × 0.000278 Multiply the value in joules by the conversion factor 0.000278.

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How to Convert Joules to Watt-hours

To convert joule to watt-hour, we use the official conversion formulas. Below is the mathematical formula, plain-English explanation, and a worked example.

joule-to-watt-hour-formula.py

# Mathematical Formula

Value in Watt-hours = Value in Joules × 0.000278

# Worked Example (5 J)

5 J × 0.000278 = 0.0014 Wh

What is a Joule?

Joule (J)

The base SI unit of energy, equal to work done by a force of one newton moving one meter.

What is a Watt-hour?

Watt-hour (Wh)

Energy equivalent to one Watt of power sustained for one hour.

Joule to Watt-hour Conversion Table

Joule (J)	Watt-hour (Wh)
1 J	0.00028 Wh
2 J	0.00056 Wh
3 J	0.00083 Wh
5 J	0.00139 Wh
10 J	0.00278 Wh
15 J	0.00417 Wh
20 J	0.00556 Wh
25 J	0.00694 Wh
50 J	0.01389 Wh
100 J	0.02778 Wh
250 J	0.06944 Wh
500 J	0.13889 Wh
1000 J	0.27778 Wh

Watt-hour to Joule Conversion Table

Watt-hour (Wh)	Joule (J)
1 Wh	3600 J
2 Wh	7200 J
3 Wh	10800 J
5 Wh	18000 J
10 Wh	36000 J
15 Wh	54000 J
20 Wh	72000 J
25 Wh	90000 J
50 Wh	180000 J
100 Wh	360000 J
250 Wh	900000 J
500 Wh	1800000 J
1000 Wh	3600000 J

Questions

Frequently Asked Questions

How do I convert joules to watt-hours?

Multiply the value in joules by the conversion factor 0.000278. For example, to convert 5 joules to watt-hours: 5 × 0.000278 = 0.0014 Wh.

What is the conversion factor from joule to watt-hour?

The conversion factor is 0.000278. One joule is equal to 0.000278 watt-hours.

What is the reverse conversion from watt-hour to joule?

To convert watt-hours back to joules, multiply by 3600 (or divide the value by 0.000278). One watt-hour is equal to 3600 joules.

How many Joules are in 1 Kilowatt-hour (kWh)?

There are exactly 3,600,000 Joules (or 3.6 Megajoules) in 1 kWh.

What is the difference between a calorie and a Calorie?

A lowercase calorie (cal) is a small metric unit (4.184 J). A capitalized Calorie (Cal) is a food calorie, which is actually a kilocalorie (1,000 small calories or 4,184 J).

Related Energy Conversions

Joule to Kilojoule Joule to Calorie (Gram) Joule to Kilocalorie (Food Cal) Joule to Kilowatt-hour Joule to BTU (British Thermal Unit) Joule to Electronvolt