Energy converter: convert joules, calories, kilocalories, kWh, BTU, electronvolts, and other energy units for physics, nutrition, electricity, and HVAC work.
Use this energy converter to convert joules, kilojoules, calories, kilocalories, kWh, BTU, electronvolts, and other common energy units instantly. It is useful for physics, chemistry, nutrition, HVAC, electricity use, and appliance energy comparisons.
Common conversions include J to cal, kWh to BTU, kcal to kJ, and similar unit checks where the same energy value needs to be shown in a different system.
Most Common Conversion Factors
| J | kJ | Wh | kcal | |
|---|---|---|---|---|
| 1 J | 1 | 0.001 | 2.778 x 10-4 | 2.388 x 10-4 |
| 1 kJ | 1000 | 1 | 0.277778 | 0.238846 |
| 1 Wh | 3600 | 3.6 | 1 | 0.860421 |
| 1 kcal | 4186.8 | 4.1868 | 1.163 | 1 |
Energy Converter FAQs
What is an energy converter?
An energy converter converts one energy unit into another, such as J, kJ, cal, kcal, kWh, BTU, or eV. It is useful whenever the same energy amount is expressed in different systems.
How do I convert joules to calories?
Enter the value, choose J as the source unit, and choose cal as the target unit. This is a common conversion when comparing scientific energy values with heat-related units.
How do I convert kWh to BTU?
Choose kWh as the source unit and BTU as the target unit. This is common in electricity, heating, cooling, HVAC sizing, and appliance energy comparisons.
What is the difference between J, cal, kcal, kWh, and BTU?J is the SI unit of energy. cal and kcal are common in heat and food energy contexts, kWh is widely used for electricity consumption, and BTU is common in heating and cooling systems.
Is kcal the same as Calories on food labels?
Yes. On food labels, a capital-C Calorie usually means 1 kcal, which is equal to 1000 cal.
When should I use an energy converter?
Use it for physics problems, nutrition checks, electricity use, HVAC comparisons, battery energy estimates, or any situation where energy data must be translated between unit systems.
Can I use this converter for electricity and energy cost calculations?
Yes. It is especially useful for conversions involving kWh, BTU, and J when comparing appliance consumption, heating output, cooling demand, or energy cost assumptions.
