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Watt Hours to Joules Converter

Convert watt hours to joules and joules to Wh instantly. Bidirectional energy converter with formula and common values.

Wh

Joules

9,000

J

2.5 Wh = 9,000 J

J = Wh × 3600

Watt Hours to Joules: 1 Wh equals 3600 J. To convert watt hours to joules, multiply by 3600 (J = Wh × 3600). For example, 10 Wh = 36000 J.

How to Convert Watt Hours to Joules

To convert from watt hours to joules, multiply the value by 3600. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Watt Hours to Joules: J = Wh × 3600
  • Joules to Watt Hours: Wh = J ÷ 3600

Watt Hours to Joules Conversion Chart

Watt Hours (Wh)Joules (J)
0.1360
0.25900
0.51800
13600
27200
310800
518000
1036000
2072000
2590000
50180000
100360000
250900000
10003600000

Understanding the Units

What is a Watt Hour?

A watt-hour equals exactly 3,600 joules.

Common contexts: phone batteries, small device energy.

What is a Joule?

The joule is the SI derived unit of energy, equal to the work done by a force of one newton acting through a distance of one meter (1 J = 1 N·m = 1 W·s).

Named after James Prescott Joule (1818–1889), the English physicist who demonstrated the mechanical equivalent of heat.

Common contexts: physics, chemistry, engineering.

Real-World Reference Points

Item Watt Hours (Wh) Joules (J)
Energy to lift an apple 1 m0.00031
Heart beat (resting)0.00031
AA battery (alkaline)2.59000

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FAQ

How many joules are in one watt hour?

One watt hour equals exactly 3,600 joules. This is because one watt equals one joule per second, and one hour has 3,600 seconds.

How do I convert watt hours to joules?

Multiply the watt hour value by 3,600. For example, 4.7 Wh × 3,600 = 16,920 J.

What is the difference between a watt and a watt hour?

A watt measures power (rate of energy transfer). A watt hour measures energy (total amount transferred). Running a 5 W device for 2 hours uses 10 Wh.

How are laptop batteries measured?

Laptop batteries are rated in watt hours (Wh). A typical laptop battery is 50-100 Wh, meaning it stores 180,000 to 360,000 joules of energy.

How many joules are in 1 watt hour?

1 Wh equals 3600 J.

How do you convert watt hours to joules?

Multiply the watt hour value by 3600. Formula: J = Wh × 3600.

How many joules are in 5 watt hours?

5 Wh = 18000 J.

How do you convert joules back to watt hours?

Use the inverse formula: Wh = J ÷ 3600. For example, 1 J = 0.000278 Wh.

What is the difference between Watt Hour and Joul?

A watt-hour equals exactly 3,600 joules. The joule is the SI derived unit of energy, equal to the work done by a force of one newton acting through a distance of one meter (1 J = 1 N·m = 1 W·s).