Energy Converter

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Quick Reference

• 1 kWh = 3,600,000 joules

• 1 calorie = 4.184 joules

• 1 kcal = 1,000 calories

• 1 BTU = 1,055.06 joules

• 1 Wh = 3,600 joules

• 1 kJ = 1,000 joules

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About Energy Converter

Convert energy units instantly and free. Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTU. Accurate energy conversions for physics, nutrition, and engineering. No registration required - works 100% in your browser.

How to Use

Step 1

Enter the energy value

Step 2

Select the unit you're converting from

Step 3

Select the unit you're converting to

Step 4

Click 'Convert' to see the result

Step 5

Perfect for physics, nutrition, and electricity

Features & Benefits

✅Convert between 10 energy units
✅SI: joule, kilojoule, megajoule
✅Calories: calorie, kilocalorie (food calories)
✅Electrical: watt-hour, kilowatt-hour
✅Imperial: BTU, foot-pound
✅High precision results
✅Quick reference table
✅100% browser-based
✅100% free

FAQs

What is a kilocalorie (kcal)?

1 kilocalorie = 1,000 calories = 4,184 joules. Food labels often show 'Calories' (capital C) which are actually kilocalories.

How many joules in a kWh?

1 kWh = 3,600,000 joules (3.6 megajoules). This is the unit used for electricity billing.

What is a BTU?

BTU (British Thermal Unit) = 1,055.06 joules. It's commonly used for heating and cooling systems in the US.