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Energy Converter
Convert between joules, calories, kilowatt-hours, BTU, foot-pounds, therms, electronvolts, and more. Enter a value and select units to convert instantly.
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Conversion Result
Joules (J): 1000
Calories (cal): 239.005736
All Conversions
| Unit | Value |
|---|---|
| Joules (J) | 1000.000000 |
| Kilojoules (kJ) | 1.000000 |
| Megajoules (MJ) | 0.001000 |
| Calories (cal) | 239.005736 |
| Kilocalories (kcal) | 0.239006 |
| Kilowatt-hours (kWh) | 0.000278 |
| Watt-hours (Wh) | 0.277778 |
| btu-calculator | 0.947817 |
| Foot-pounds (ft·lb) | 737.562149 |
| Therms | 0.000009 |
| Electronvolts (eV) | 6.241509074460763e+21 |
| Ergs | 10000000000.000000 |
Common Energy Reference Values
| Conversion | Value |
|---|---|
| 1 calorie in joules | 1 cal = 4.184 J |
| 1 kWh in joules | 1 kWh = 3.6 MJ |
| 1 BTU in joules | 1 BTU = 1,055.06 J |
| 1 therm in kWh | 1 therm = 29.307 kWh |
| 1 ft·lb in joules | 1 ft·lb = 1.3558 J |
| 1 eV in joules | 1 eV = 1.602 × 10⁻¹⁹ J |
| Daily human energy | 2,000 kcal = 8.368 MJ |
| 1 liter of gasoline | 34.2 MJ = 9.5 kWh |
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Frequently Asked Questions
- How do I convert joules to calories?
- Divide joules by 4.184. For example, 418.4 J / 4.184 = 100 cal.
- How do I convert calories to joules?
- Multiply calories by 4.184. For example, 100 cal x 4.184 = 418.4 J.
- How do I convert kWh to joules?
- Multiply kWh by 3,600,000. For example, 1 kWh = 3.6 MJ.
- How do I convert joules to kWh?
- Divide joules by 3,600,000. For example, 3,600,000 J / 3.6e6 = 1 kWh.
- How do I convert BTU to joules?
- Multiply BTU by 1,055.06. For example, 10 BTU x 1,055.06 = 10,550.6 J.
- How do I convert joules to BTU?
- Divide joules by 1,055.06. For example, 10,550.6 J / 1,055.06 = 10 BTU.
- How do I convert ft·lb to joules?
- Multiply ft·lb by 1.35582. For example, 100 ft·lb x 1.35582 = 135.582 J.
- How do I convert joules to ft·lb?
- Divide joules by 1.35582. For example, 135.582 J / 1.35582 = 100 ft·lb.
- What is the difference between calorie and kilocalorie?
- 1 kcal = 1,000 cal. Food calories (Cal) are actually kilocalories. 1 food Cal = 4,184 J.
- How many joules are in a kilowatt-hour?
- There are 3,600,000 joules in one kilowatt-hour.
- How many BTU are in a therm?
- There are 100,000 BTU in one therm. Therms are used for natural gas billing.
- What is energy?
- Energy is the capacity to do work, measured in joules (SI). Energy can be kinetic, potential, thermal, chemical, electrical, or nuclear.
- How do I convert kWh to calories?
- Multiply kWh by 860,421. For example, 1 kWh = 860,421 cal = 860.4 kcal.
- How do I convert calories to kWh?
- Divide calories by 860,421. For example, 860,421 cal / 860,421 = 1 kWh.
- How do I convert ergs to joules?
- Multiply ergs by 1e-7. For example, 10,000,000 erg = 1 J.
- How do I convert joules to ergs?
- Multiply joules by 10,000,000. For example, 1 J = 10⁷ erg.
- How do I convert electronvolts to joules?
- Multiply eV by 1.602 × 10⁻¹⁹. For example, 1 eV = 1.602 × 10⁻¹⁹ J.
- How do I convert joules to electronvolts?
- Divide joules by 1.602 × 10⁻¹⁹. For example, 1 J = 6.242 × 10¹⁸ eV.
- How do I convert therm to kWh?
- Multiply therms by 29.3071. For example, 1 therm = 29.3071 kWh.
- How do I convert kWh to therm?
- Divide kWh by 29.3071. For example, 29.3071 kWh = 1 therm.
- How much energy is in food?
- Food energy is measured in Calories (kcal). Protein and carbs have 4 kcal/g, fat has 9 kcal/g.
- How do I calculate electrical energy?
- Energy = Power × Time. A 1,000 W device running for 1 hour uses 1 kWh = 3.6 MJ.
- How many kWh does a house use?
- A typical US home uses about 900 kWh per month (30 kWh/day, about 108 GJ annually).
- What is the law of conservation of energy?
- Energy cannot be created or destroyed, only converted from one form to another. Total energy in a closed system is constant.
- How do I convert between kJ and kcal?
- Divide kJ by 4.184 to get kcal. For example, 836.8 kJ / 4.184 = 200 kcal.
- How do I convert MJ to kWh?
- Divide MJ by 3.6. For example, 36 MJ / 3.6 = 10 kWh.
- How do I convert kWh to MJ?
- Multiply kWh by 3.6. For example, 10 kWh x 3.6 = 36 MJ.
- How much energy is in a barrel of oil?
- One barrel of oil (42 gallons) contains about 6.12 GJ = 1,700 kWh = 5.8 million BTU.
- What is the difference between energy and power?
- Energy is total work done (joules). Power is the rate of energy use (watts = J/s). A 100 W bulb uses 100 J/s.
- How much energy does the Sun produce?
- The Sun produces about 3.8 × 10²⁶ W of power, equivalent to 3.8 × 10²⁶ J of energy every second.