HomeConvertersEnergyBTU to Kilojoules conversion
Energy conversion

BTU to Kilojoules conversion

Convert BTU (IT) to kilojoules (kJ). Factor: 1 BTU ≈ 1.05505585 kJ. Formula, examples, and chart. Switch BTU → kJ or kJ → BTU. Works offline-ready.

Instant result
Result
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Enter values to convert.

Inputs —
Mode —
Formula —

Formulas

Core equations used by this converter.

BTU → kJkJ = BTU × 1.0550559
Exact factor1 BTU = 1.0550559 kJ
kJ → BTUBTU = kJ × 0.94781712
iLinear conversion using factor 1.0550559. Prefer the exact factor over rounded multipliers when precision matters.

How to use

1

Choose BTU → kJ or kJ → BTU

Use the tabs to switch direction. Forward mode needs btu; reverse uses the opposite unit.

2

Enter the value

Type a non-negative value in the active unit field.

3

Convert and read the result

Use Convert or let the result update automatically.

Example conversions

Common values with formula and result.

ϟ

1 BTU to kJ

1 BTU to kJ

1 × 1.05505585 = 1.05505585 kJ
1.05505585 kJ
ϟ

100 BTU to kJ

100 BTU to kJ

100 × 1.05505585 = 105.505585 kJ
105.505585 kJ
ϟ

1000 BTU to kJ

1000 BTU to kJ

1000 × 1.05505585 = 1055.05585 kJ
1055.05585 kJ
ϟ

Reverse: 1.05505585 kJ → BTU

Reverse: 1.05505585 kJ → BTU

1.05505585 / 1.05505585 = 1 BTU
1 BTU

BTU to Kilojoules conversion specification

Version 1.1.0 · Engine tested

Calculation status
  • Engine tested 4 published cases
  • Named expert review Not performed
  • Calculation version 1.1.0

Review policy

Definition
BTU (BTU) converts to kJ using a fixed linear factor. Convert BTU (IT) to kilojoules (kJ). Factor: 1 BTU ≈ 1.05505585 kJ. Formula, examples, and chart.
What it calculates
Value between BTU and kJ. Switch direction with the converter tabs.
Inputs
  • BTU (BTU) or reverse unit (kJ)
Outputs
  • Converted value in kJ or BTU
Formula
kJ = BTU × 1.0550559 · 1 BTU = 1.0550559 kJ
BTU to kilojoules conversion table
BTU (IT)Kilojoules (kJ)
1 BTU1.05505585 kJ
10 BTU10.550558500000001 kJ
100 BTU105.505585 kJ
1000 BTU1055.05585 kJ
10,000 BTU10550.558500000001 kJ
Assumptions
  • Conversion runs locally in the browser; values are not uploaded.
  • Uses the standard factor/definition for these units.
Units
  • BTU → kJ
  • kJ → BTU
Boundary conditions
  • Empty or non-numeric input yields no valid result.
  • Non-negative values are expected for physical quantities.
Example
1 BTU → 1.05506 kJ
Validation cases
  • 1 BTU → 1.0550559 kJ
  • 10 BTU → 10.550559 kJ
  • 50 BTU → 52.752792 kJ
  • 100 BTU → 105.50558 kJ
Sources
  • SI / international unit definitions where applicable
  • CalculatorX conversion factors (local runtime)
Calculation version
1.1.0

Background

Interpretation and common distinctions.

Use the converter tabs to switch direction when available. Results for BTU to Kilojoules conversion update locally in your browser.

kilo Kilojoules to BTU › btu BTU to joules › btu BTU to kWh ›

Frequently asked questions

Key distinctions behind the conversion.

How do you convert using BTU to Kilojoules conversion?

Use 1 BTU = 1.05505585 kJ. Example: 1 BTU to kJ → 1.05505585 kJ.

Can I switch direction?

Use the converter tabs when available, or open the related reverse tool from Related.

Does this run online or locally?

Calculation runs locally in your browser. Values are not uploaded.

How precise are the results?

Results follow the formulas on this page. Round to the precision your use case needs.