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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

How to Convert BTU to Joules

Multiply the BTU value by 1,055.06 to get joules. The BTU is a traditional unit of heat common in US energy applications, particularly HVAC and gas utility billing. One BTU represents roughly the energy released by burning a single wooden match.

Conversion Formula

  • BTU to Joules: J = BTU × 1055.06
  • Joules to BTU: BTU = J ÷ 1055.06

Common Conversions

British Thermal UnitsJoules
55,275.3
2526,376.5
100105,506
500527,530
1,0001,055,060
10,00010,550,600
100,000105,506,000

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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).