Convert between joules, calories, kWh, and BTU.
Free to use, no sign-up required. Energy Converter is one of 198 tools built into Xenition, alongside a chat that can use them for you.
Converts energy between joules, calories, watt-hours, BTU, foot-pounds and electronvolts. Typical uses are food energy, electricity bills in kWh, heating in BTU, and physics problems.
Every unit is stored in joules. The calorie is the thermochemical calorie of 4.184 J, 1 Wh is 3,600 J (one watt for 3,600 seconds), 1 BTU is 1,055.05585 J, and 1 eV is 1.602176634 × 10⁻¹⁹ J.
A 2,000 kcal daily diet is 2.324444 kWh of energy. One kWh of electricity is 3,412.141642 BTU.
No. The Calorie on food labels, often with a capital C, is a kilocalorie (kcal), 1,000 small calories. A 250 Calorie snack is 250 kcal, about 1,046 kJ, which is the figure on labels in Europe and Australia.
kWh is energy, what you are billed for. kW is power, the rate of using it. A 2 kW heater running for 3 hours uses 6 kWh. Power is on the power converter, not here.
Energy Converter converts between 9 units: eV, J, ft·lb, cal, kJ, BTU, Wh, kcal and kWh. Factors are given against J.
| Unit | In J | 1 J equals |
|---|---|---|
| 1 eV | 0 J | 6241509074460763136 eV |
| 1 ft·lb | 1.3558179 J | 0.7375621756 ft·lb |
| 1 cal | 4.184 J | 0.2390057361 cal |
| 1 kJ | 1000 J | 0.001 kJ |
| 1 BTU | 1055.05585 J | 0.0009478171 BTU |
| 1 Wh | 3600 J | 0.0002777778 Wh |
| 1 kcal | 4184 J | 0.0002390057 kcal |
| 1 kWh | 3600000 J | 0.0000002778 kWh |
Common quantities in J, converted. Every value is computed from the factors above, so the chart and the converter cannot disagree.
| J | eV | ft·lb | cal | kJ |
|---|---|---|---|---|
| 1 J | 6241509074460763136 | 0.7375621756 | 0.2390057361 | 0.001 |
| 2 J | 12483018148921526272 | 1.4751243511 | 0.4780114723 | 0.002 |
| 5 J | 31207545372303814656 | 3.6878108778 | 1.1950286807 | 0.005 |
| 10 J | 62415090744607629312 | 7.3756217557 | 2.3900573614 | 0.01 |
| 25 J | 156037726861519060992 | 18.4390543892 | 5.9751434034 | 0.025 |
| 100 J | 624150907446076243968 | 73.7562175569 | 23.9005736138 | 0.1 |
1 J is 6241509074460763136 eV. To convert J to eV, divide by 0 — so 10 J is 62415090744607629312 eV.
1 eV is 0 J. To convert eV to J, multiply by 0 — so 10 eV is 0 J.
1 J is 0.7375621756 ft·lb. To convert J to ft·lb, divide by 1.3558179 — so 10 J is 7.3756217557 ft·lb.
1 ft·lb is 1.3558179 J. To convert ft·lb to J, multiply by 1.3558179 — so 10 ft·lb is 13.558179 J.
1 J is 0.2390057361 cal. To convert J to cal, divide by 4.184 — so 10 J is 2.3900573614 cal.
1 cal is 4.184 J. To convert cal to J, multiply by 4.184 — so 10 cal is 41.84 J.
1 J is 0.001 kJ. To convert J to kJ, divide by 1000 — so 10 J is 0.01 kJ.
1 kJ is 1000 J. To convert kJ to J, multiply by 1000 — so 10 kJ is 10000 J.
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