Formula
J to cal conversion formula
Use this relationship for a direct conversion:
Worked example
2 J = 0.4780114723 cal.
The thermochemical calorie and International Table BTU are named explicitly to avoid ambiguous legacy definitions.
Energy conversion
1 joule (J) equals 0.239005736138 thermochemical calorie (cal). Enter any value below to convert from J to cal.
Enter a value and choose units. Results update instantly.
1 J = 0.2390057361 cal
| Unit | Value |
|---|---|
| Joule J | 1 |
| Kilojoule kJ | 0.001 |
| Thermochemical calorie cal | 0.2390057361 |
| Kilocalorie kcal | 0.0002390057 |
| Watt-hour Wh | 0.0002777778 |
| Kilowatt-hour kWh | 0.0000002778 |
| BTU (International Table) BTUₕᵀ | 0.0009478171 |
| Foot-pound ft·lb | 0.7375621493 |
| Electronvolt eV | 6.2415090745e18 |
Formula
Use this relationship for a direct conversion:
2 J = 0.4780114723 cal.
The thermochemical calorie and International Table BTU are named explicitly to avoid ambiguous legacy definitions.
Quick reference
| Joule (J) | Thermochemical calorie (cal) |
|---|---|
| 0.01 | 0.0023900574 |
| 0.1 | 0.0239005736 |
| 1 | 0.2390057361 |
| 2 | 0.4780114723 |
| 5 | 1.1950286807 |
| 10 | 2.3900573614 |
| 25 | 5.9751434034 |
| 50 | 11.9502868069 |
| 100 | 23.9005736138 |
| 1,000 | 239.0057361377 |
From unit
The SI unit of energy, equal to one newton meter.
Symbol: J
To unit
Exactly 4.184 joules.
Symbol: cal
Keep converting
Source
Definitions are checked against NIST SP 811: Energy units. Calculations use full internal precision before display rounding.
View the complete energy converterQuestions
Use the formula cal = J x 0.239005736138. 1 joule (J) equals 0.239005736138 thermochemical calorie (cal).
Both unit definitions use exact factors. Only the displayed decimal may be rounded.