J to cal Converter

Convert Joules to Calories instantly

Formula:

cal = J ÷ 4.184

1 calorie = 4.184 joules

🔗 Related Energy Converters

kJ → kcal kcal → kJ kcal → cal cal → kcal J → kJ kJ → J cal → J ft-lb → Nm Nm → ft-lb All Converters

J to cal (Joules → Calories)

1. Core Idea

Convert SI energy (joules) to the small calorie by dividing by 4.184. 1 cal = 4.184 J (thermochemical definition).

2. Formula

cal = J ÷ 4.184

J = cal × 4.184

For food labels use kcal (1 kcal = 4184 J).

3. Quick Values

  • 4.184 J → 1 cal
  • 41.84 J → 10 cal
  • 209.2 J → 50 cal
  • 418.4 J → 100 cal
  • 1046 J → 250 cal
  • 2084 J → 498.3 cal
  • 4184 J → 1000 cal
  • 41,840 J → 10,000 cal

4. 3-Step Example

Convert 2500 J to calories

  1. Formula: cal = J ÷ 4.184
  2. Insert: 2500 ÷ 4.184
  3. = 597.6 cal (≈ 598 cal)

5. Where It’s Used

Calorimetry readings, lab heat measurements, thermodynamic tables, legacy literature, small sample energy reporting.

6. Accuracy & Tips

  • Always clarify if kcal vs cal.
  • Use 4.184 (exact) not 4.2 for formal work.
  • Convert to kJ for larger energies (divide J by 1000).
  • Sig figs should match input precision.

7. More Examples

Jcal
5011.95
27565.72
900215.2
50001,195.4

8. FAQ

Is 1 calorie defined or measured?

Defined exactly as 4.184 joules (thermochemical). Older definitions varied slightly.

How do I get food Calories?

Divide joules by 4184 to get kilocalories (food Calories).