Free Energy Converter
Electricity bills count kilowatt-hours, food labels count kilocalories, and heaters are rated in BTU. This free energy converter connects them all — joules, calories, watt-hours, BTU and even electronvolts — with instant results and a full equivalence table.
Value in all energy units
| Unit | Value |
|---|
How to Use the Energy Converter
- Enter a value in the input box above.
- Choose the units to convert from and to — use the ⇄ button to swap them instantly.
- See the result immediately, plus the value converted into every other energy unit in the table below.
- Copy the result with one click to use it anywhere.
Features
Nine energy units covering physics (joules, electronvolts), nutrition (calories, kilocalories), utilities (watt-hours, kilowatt-hours) and heating (BTU, foot-pounds). Live results and one-click swapping included.
Benefits & Use Cases
Homeowners comparing energy bills, dieters checking food energy, students doing physics, and engineers sizing systems all get exact conversions. Seeing kWh next to joules makes abstract bills concrete.
Tips
One kWh equals 3.6 million joules — that is why the joule numbers look huge. Food “calories” are actually kilocalories: a 500 kcal meal is 500,000 scientific calories.
Frequently Asked Questions
How many joules are in a kWh?
3,600,000 joules (3.6 MJ).
How do I convert calories to joules?
Multiply by 4.184. A 2,000 kcal diet is about 8,368,000 joules.
How many BTU are in a kWh?
About 3,412 BTU per kWh.
What is an electronvolt?
The energy an electron gains crossing one volt: 1.602 × 10⁻¹⁹ joules. Standard in particle physics.
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