How do I convert cal to kJ?

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

What is the formula for cal to kJ?

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

When should I use cal vs kJ?

cal 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 cal to kJ

Use the live converter below to translate between Calorie (cal) 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

cal → kJ

Calorie

cal

Kilojoule

0.0042

Rounded result (4 decimals max)

Formula

1 cal = 0.0042 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 cal.

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cal 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.

Calorie (cal)	Kilojoule (kJ)
0.25 cal	0.001 kJ
0.5 cal	0.0021 kJ
1 cal	0.0042 kJ
2 cal	0.0084 kJ
5 cal	0.0209 kJ
10 cal	0.0418 kJ
25 cal	0.1046 kJ
100 cal	0.4184 kJ

kJ back to cal

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

Kilojoule (kJ)	Calorie (cal)
0.25 kJ	59.7514 cal
0.5 kJ	119.5029 cal
1 kJ	239.0057 cal
2 kJ	478.0115 cal
5 kJ	1,195.0287 cal
10 kJ	2,390.0574 cal
25 kJ	5,975.1434 cal
100 kJ	23,900.5736 cal

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