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British Thermal Units to Joules Converter

Convert British Thermal Units to joules and joules to BTU instantly. Bidirectional energy converter with formula and common values.

BTU

Joules

105,506

J

100 BTU = 105,506 J

J = BTU × 1055.06

British Thermal Units to Joules: 1 BTU equals 1055.06 J. To convert british thermal units to joules, multiply by 1055.06 (J = BTU × 1055.06). For example, 10 BTU = 10550.6 J.

How to Convert British Thermal Units to Joules

To convert from british thermal units to joules, multiply the value by 1055.06. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • British Thermal Units to Joules: J = BTU × 1055.06
  • Joules to British Thermal Units: BTU = J ÷ 1055.06

British Thermal Units to Joules Conversion Chart

British Thermal Units (BTU)Joules (J)
0.1105.506
0.25263.765
0.5527.53
11055.06
22110.12
33165.18
55275.3
1010550.6
2021101.2
2526376.5
5052753
100105506
250263765
10001055060

Understanding the Units

What is a British Thermal Unit?

A British thermal unit (BTU) equals approximately 1,055.06 joules — the energy needed to raise one pound of water by one degree Fahrenheit.

Common contexts: HVAC, natural gas (US), heating systems.

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 British Thermal Units (BTU) Joules (J)
Energy to lift an apple 1 m0.00091
Heart beat (resting)0.00091
AA battery (alkaline)8.53039000

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FAQ

What is a British Thermal Unit (BTU)?

A BTU is the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit. It is widely used in the US for HVAC, heating, and energy ratings.

How many joules are in one BTU?

One BTU equals approximately 1,055.06 joules. The exact value depends on the BTU definition used (thermochemical vs. International Table), but 1,055.06 J is the most common standard.

Why are BTUs still used instead of joules?

BTUs remain the standard in US heating, cooling, and natural gas industries. Air conditioner capacities, furnace ratings, and gas bills are typically expressed in BTUs because the industry adopted them before SI standardization.

How do I convert 75 BTU to joules?

Multiply 75 by 1,055.06. So 75 BTU = 79,129.5 J (approximately 79.13 kJ).

How many joules are in 1 british thermal unit?

1 BTU equals 1055.06 J.

How do you convert british thermal units to joules?

Multiply the british thermal unit value by 1055.06. Formula: J = BTU × 1055.06.

How many joules are in 5 british thermal units?

5 BTU = 5275.3 J.

How do you convert joules back to british thermal units?

Use the inverse formula: BTU = J ÷ 1055.06. For example, 1 J = 0.000948 BTU.

What is the difference between British Thermal Unit and Joul?

A British thermal unit (BTU) equals approximately 1,055.06 joules — the energy needed to raise one pound of water by one degree Fahrenheit. 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).