Energy Converter

Quick and Accurate Energy Unit Conversions

Our Energy Converter makes it easy to switch between different energy measurements — from joules, kilojoules, and calories to kilowatt-hours, BTUs, and watt-hours.

This tool is useful for:

• Science & physics – converting between joules, calories, and kWh for experiments

• Electricity & power – switching between kWh, watt-hours, and joules

• Heating & cooling – converting BTUs to joules or kWh for HVAC calculations

• Food & nutrition – converting calories (kcal) to joules

Common examples:

• 1 kWh = 3,600,000 joules

• 1 calorie (kcal) = 4184 joules

• 1 BTU = 1055.06 joules

• 1 joule = 0.000277778 Wh

Simply type in your value, choose your units, and get an instant, accurate conversion — without doing any manual math.

FAQ – Energy Converter

1. What units does the converter support?
Joules (J), kilojoules (kJ), calories (cal & kcal), kilowatt-hours (kWh), watt-hours (Wh), BTUs, and more.

2. Can I use it for electricity bill calculations?
Yes — you can convert between kWh, Wh, and joules easily.

3. Is it accurate for scientific use?
Yes — it uses precise formulas for each unit conversion.

4. Does it work for both metric and imperial units?
Yes — it supports all major systems.

5. Is it free to use?
Yes — it’s an online tool that works in any browser with no sign-up needed.