EnergyBtu to Kilojoules

BTU to Kilojoules

Methodology·How We Verify

Snapshot

1 BTU equals 1.055056 Kilojoules.

Reference basis: This conversion uses exact joule-based energy definitions.
Example: For 5 BTU, the result equals 5.275279 Kilojoules.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

1.055056 Kilojoules (kJ)

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API and AI agent access

BTU to Kilojoules.

Machine-readable identifiers

Conversion family: energy
Source unit: btu
Target unit: kilojoules

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "energy",
  "value": 1,
  "from": "btu",
  "to": "kilojoules"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "energy",
    "value": 1,
    "from": "btu",
    "to": "kilojoules",
    "result": {
      "raw": 1.05505585262,
      "display": "1.055056"
    },
    "canonicalPath": "/energy/btu-to-kilojoules/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Multiply by 1.05505585262 (derived from joules) because 1 BTU = 1055.05585262 J and 1 kJ = 1000 J.

Method & Reference

Method basis: exact conversion formula shown in Snapshot.
Applied factor: 1 BTU = 1.055056 Kilojoules (using exact joule-based energy definitions).
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

BTU (BTU)	Kilojoules (kJ)
1	1.055056
5	5.275279
10	10.550559
100	105.505585
1000	1,055.055853
3600	3,798.201069
10000	10,550.558526
1000000	1,055,055.85262

Questions & answers

Frequently Asked Questions

What is 1 btu in kilojoules?

1 BTU equals 1.055056 Kilojoules on this page.

When would I convert btu to kilojoules?

This route is useful when translating thermal and nutritional energy values across calories, kilocalories, BTU, and joule-based references without mixing the underlying definitions.

How do I reverse BTU to Kilojoules?

Use the mirror Kilojoules to BTU route; it applies the inverse relationship with the same energy assumptions.