How do I convert kcal to kJ?

Use the formula shown above or enter a value to see kcal converted to kJ instantly.

What is the formula for kcal to kJ?

The converter calculates kJ by applying the category-specific conversion factor for Energy.

When should I use kcal vs kJ?

kcal and kJ are both part of the Energy category; pick the unit that matches your measurement context (e.g., scale, region, or industry standard).

Energy Conversion Guide

Convert kcal to kJ

Use the live converter below to translate between Kilocalorie (food) (kcal) and Kilojoule (kJ). Scroll further for quick examples, formula tips, and related units.

Formula insight: Most unit conversions use a simple multiplication or division by a conversion factor. The calculator shows the exact formula used.

Convert

kcal → kJ

Kilocalorie (food)

kcal

Kilojoule

4.184

Rounded result (4 decimals max)

Formula

1 kcal = 4.184 kJ

Conversion sourcesTap or click to view references

The International System of Units (SI) — NIST Special Publication 330
National Institute of Standards and Technology (NIST). The SI Brochure (SP 330) is the definitive English edition of the BIPM SI tables. NIST’s edition lists the official constants and conversion factors tying inch-pound units to SI, which SwapUnits applies for length, mass, temperature, pressure, volume, and related conversions. See /standards/nist-si-tenfold for the complete decimal multiple/submultiple table. View source · View SI table

Results update as you type. Swap the direction to convert back from kJ to kcal.

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kcal to kJ quick table

Multiply any row by the same factor to scale results. Use the converter above to enter exact values with your own units.

Kilocalorie (food) (kcal)	Kilojoule (kJ)
0.25 kcal	1.046 kJ
0.5 kcal	2.092 kJ
1 kcal	4.184 kJ
2 kcal	8.368 kJ
5 kcal	20.92 kJ
10 kcal	41.84 kJ
25 kcal	104.6 kJ
100 kcal	418.4 kJ

kJ back to kcal

Keep the reciprocal handy when double-checking calculations or undoing a conversion.

Kilojoule (kJ)	Kilocalorie (food) (kcal)
0.25 kJ	0.0598 kcal
0.5 kJ	0.1195 kcal
1 kJ	0.239 kcal
2 kJ	0.478 kcal
5 kJ	1.195 kcal
10 kJ	2.3901 kcal
25 kJ	5.9751 kcal
100 kJ	23.9006 kcal

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