Kilojoules to Kilocalories (food calories) (kJ to kcal)

Formula

1 kJ = 0.239006 kcal

kilocalories (food calories) = kilojoules × 0.2390057361 — reverse: kilojoules = kilocalories (food calories) × 4.184

The factor is derived from the SI definitions of both units (base unit: J) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.

Worked examples

• 5 kJ = 1.19503 kcal
• 12.5 kJ = 2.98757 kcal
• 100 kJ = 23.9006 kcal

Kilojoules to kilocalories (food calories) conversion table

FAQ

How many kilocalories (food calories) are in one kilojoule?

1 kJ = 0.239006 kcal. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

What is the formula to convert kilojoules to kilocalories (food calories)?

Multiply the value in kilojoules by 0.2390057361: kilocalories (food calories) = kilojoules × 0.2390057361. For example, 5 kJ = 1.19503 kcal.

How do I convert kilocalories (food calories) back to kilojoules?

Multiply by the inverse factor 4.184 (kilojoules = kilocalories (food calories) × 4.184), or use the kilocalories (food calories)-to-kilojoules page.

Related conversions

• Kilocalories (food calories) to kilojoules (reverse)
• Energy Converter — all energy units in one tool
• Joules to Calories (small, thermochemical)
• Calories (small, thermochemical) to Joules
• Kilowatt-hours to Megajoules
• Megajoules to Kilowatt-hours
• Kilowatt-hours to BTU
• BTU to Kilowatt-hours
• BTU to Joules
• Joules to BTU

Machine access

• API: GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=kJ&to_unit=kcal
• MCP: server https://tttkmbb.com/mcp, tool convert_units with {"value":5,"from_unit":"kJ","to_unit":"kcal"}
• Markdown: https://tttkmbb.com/conversion/kj-to-kcal.md · JSON: https://tttkmbb.com/conversion/kj-to-kcal.json (add ?value= for a result) · Units: /api/v1/units?quantity=energy
• OpenAPI operationId: convert_units. Freshness: static. Authentication: none.

Sources

• NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors (standard)
• BIPM – The International System of Units (SI Brochure, 9th edition) (standard)
• Wikipedia – Conversion of units (reference)