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Joules to Calories

1 joule = 0.23901 calories · 1 cal = 4.184 J

1 joule = 0.23901 calories

How it’s calculated

cal = J ÷ 4.184

  • Divide the value in joules by 4.184.
  • Equivalently, multiply by 0.2390057361.
  • 1 J = 0.2390057361 cal · 1 cal = 4.184 J
Show worked solutionFactor, unit cancellation and rounding, step by step

  1. Find the conversion factor

    By definition 1 cal = 4.184 J. Source: BIPM SI Brochure (9th ed.); NIST SP 811 / Handbook 44.

  2. Multiply by the factor written as a fraction

    Put J in the denominator so it cancels, leaving cal.

  3. Calculate (unrounded)

  4. Round the answer

    Rounded to 5 significant figures.

Answer: 0.23901 cal

1 J in other units

Batch convert J → cal
Results
  1. 1 J = 0.23901 cal
  2. 5 J = 1.195 cal
  3. 10 J = 2.3901 cal
  4. 25 J = 5.9751 cal

Permanent link to this conversion

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Quick examples

  • 1 joule = 0.23901 calories
  • 5 joules = 1.195 calories
  • 10 joules = 2.3901 calories
  • 25 joules = 5.9751 calories
  • 100 joules = 23.901 calories

About these units

Joule (J)

SI (metric)

Base unit

Source: BIPM SI Brochure (9th ed.)

Calorie (thermochemical) (cal)

other

Thermochemical calorie: exactly 4.184 J.

1 cal = 4.184 J

Source: NIST SP 811 / Handbook 44

Joules to calories conversion table

joule (J) to calorie (thermochemical) (cal)
Joules (J)Calories (cal)
0.1 J0.023901 cal
0.5 J0.1195 cal
1 J0.23901 cal
2 J0.47801 cal
3 J0.71702 cal
4 J0.95602 cal
5 J1.195 cal
6 J1.434 cal
7 J1.673 cal
8 J1.912 cal
9 J2.1511 cal
10 J2.3901 cal
15 J3.5851 cal
20 J4.7801 cal
25 J5.9751 cal
30 J7.1702 cal
40 J9.5602 cal
50 J11.95 cal
75 J17.925 cal
100 J23.901 cal
250 J59.751 cal
500 J119.5 cal
1,000 J239.01 cal

Related conversions

Frequently asked questions

How do I convert joules to calories?

Use cal = J ÷ 4.184. Divide the value in joules by 4.184.

How many calories are in 1 joule?

1 joule (J) equals 0.23901 calories (cal); more precisely 0.2390057361.

How many joules are in 1 calorie (thermochemical)?

1 calorie (thermochemical) (cal) equals 4.184 joules (J).

What is 10 J in cal?

10 joules = 2.3901 calories.

What is a calorie (thermochemical)?

Thermochemical calorie: exactly 4.184 J.

Formula: cal = J ÷ 4.184. Factors last reviewed 2026-10-27.