Energy Converter

Convert between 25+ energy units instantly. From joules to calories, kWh to BTU, electron volts to food calories with real-world comparisons.

⚡ Energy Converter

Current Energy

1 calorie = 4.184 J. 1 food Calorie (kcal) = 4,184 J. 1 kWh = 3,600,000 J. 1 BTU = 1,055.06 J.

Energy ValueJ

Converted Energycal

Conversion Factor

1 J = 0.2390 cal

📊 Result

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Enter an energy value and select units to see conversion with all-unit breakdown, food energy equivalents and real-world comparisons.

📋 Energy Conversion Table

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📊 Famous Energy References

FAQs

What is the difference between calorie and Calorie?▼

A small calorie (cal) = 4.184 joules. A large Calorie or kilocalorie (kcal) = 4,184 joules. Food labels use kcal. So 200 Calories on food = 200 kcal = 200,000 small calories.

What is a joule?▼

The joule (J) is the SI unit of energy. 1 joule = energy needed to move 1 newton through 1 meter = 1 watt-second. Named after James Prescott Joule.

What is a kilowatt-hour?▼

A kilowatt-hour (kWh) = 3,600,000 joules. It is the energy consumed by a 1,000-watt appliance running for 1 hour. Standard unit for electricity billing.

What is a BTU?▼

BTU (British Thermal Unit) = 1,055.06 joules. Energy needed to raise 1 pound of water by 1 degree Fahrenheit. Used in HVAC and heating industries.

What is an electron volt?▼

An electron volt (eV) = 1.602 x 10^-19 joules. Energy gained by one electron through 1 volt. Used in atomic and particle physics.

What is E=mc2?▼

Einstein's equation: E = energy, m = mass, c = speed of light. 1 kg of mass = about 90 petajoules. This powers nuclear reactors and atomic bombs.

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