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BTU Converter Calculator

Work out btu converter instantly with clear inputs, formula shown and shareable results.

About BTU Converter Calculator

Each energy unit is defined as a multiple of the joule, so the conversion runs in two steps: multiply by the source unit's factor to reach joule, then divide by the target unit's factor. One factor per unit covers every pair in the list. This uses the International Table BTU of 1,055.05585262 J, the value standard in HVAC work.

Formulas

Two-step conversion

result = value × factor(from) ÷ factor(to)

Base value

base (joule) = value × factor(from)

Worked example

With the default values below, BTU Converter Calculator returns Converted Value of 1.055056. Change any input above and every figure here is recalculated in your browser.

Inputs used

Value
1
From unitone of Joule (J), Kilojoule (kJ), Megajoule (MJ), Calorie (cal), Kilocalorie (kcal / food Calorie), Watt-hour (Wh), Kilowatt-hour (kWh), British thermal unit (BTU), Therm (100,000 BTU), Foot-pound force (ft·lbf), Electronvolt (eV)
British thermal unit (BTU)
To unitone of Joule (J), Kilojoule (kJ), Megajoule (MJ), Calorie (cal), Kilocalorie (kcal / food Calorie), Watt-hour (Wh), Kilowatt-hour (kWh), British thermal unit (BTU), Therm (100,000 BTU), Foot-pound force (ft·lbf), Electronvolt (eV)
Kilojoule (kJ)

Results

Converted Value
1.055056
Result Unit
Kilojoule (kJ)
Value in joule (base)
1,055.055853
Multiplier Applied
1.05505585

Step by step

  1. 1Values used
  2. 2Two-step conversion
  3. 3Base value
  4. 4Converted Value= 1.055056
  5. 5Result Unit= Kilojoule (kJ)
  6. 6Value in joule (base)= 1,055.055853
  7. 7Multiplier Applied= 1.05505585

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why route through joule?

With 11 units, direct pairs would mean 110 factors to maintain. Going via joule needs one factor per unit and gives the same answer.

Does the dropdown order matter?

Yes. The first is the unit your figure is already in; the second is what you want it in. Swapping them inverts the result.

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