Reference sheet
Energy conversion chart
Joules, kWh, calories, BTU. Factors are given to 7 significant figures; open the converter for full precision and the worked solution.
| Unit | In J | 1 J in unit |
|---|---|---|
| joule (J) | 1 J | 1 J |
| kilojoule (kJ) | 1,000 J | 0.001 kJ |
| megajoule (MJ) | 1,000,000 J | 0.000001 MJ |
| calorie (thermochemical) (cal) | 4.184 J | 0.2390057 cal |
| kilocalorie (food Calorie) (kcal) | 4,184 J | 0.0002390057 kcal |
| watt-hour (Wh) | 3,600 J | 0.0002777778 Wh |
| kilowatt-hour (kWh) | 3,600,000 J | kWh |
| British thermal unit (IT) (BTU) | 1,055.056 J | 0.0009478171 BTU |
| therm (US) (thm) | 105,480,400 J | thm |
| foot-pound (energy) (ft·lbf) | 1.355818 J | 0.7375621 ft·lbf |
| electronvolt (eV) | J | eV |
| kcal | kJ |
|---|---|
| 0.1 kcal | 0.4184 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 |
| 20 kcal | 83.68 kJ |
| 25 kcal | 104.6 kJ |
| 50 kcal | 209.2 kJ |
| 100 kcal | 418.4 kJ |
| 250 kcal | 1,046 kJ |
| 500 kcal | 2,092 kJ |
| 1,000 kcal | 4,184 kJ |
| kJ | kcal |
|---|---|
| 0.1 kJ | 0.02390057 kcal |
| 0.5 kJ | 0.1195029 kcal |
| 1 kJ | 0.2390057 kcal |
| 2 kJ | 0.4780115 kcal |
| 5 kJ | 1.195029 kcal |
| 10 kJ | 2.390057 kcal |
| 20 kJ | 4.780115 kcal |
| 25 kJ | 5.975143 kcal |
| 50 kJ | 11.95029 kcal |
| 100 kJ | 23.90057 kcal |
| 250 kJ | 59.75143 kcal |
| 500 kJ | 119.5029 kcal |
| 1,000 kJ | 239.0057 kcal |
Formula: kJ = kcal × 4.184
Need another value? Use the kcal to kJ converter or the energy converter.
Unitglide · unitglide.app/reference/energy · Factors from NIST SP 811, NIST Handbook 44 and the BIPM SI Brochure (9th ed.). Values rounded to 7 significant figures unless exact.