How do I convert calories to joules?

One calorie equals 4.184 joules. To convert calories to joules, multiply by 4.184. Note: food 'Calories' (capital C) are actually kilocalories (kcal), so 1 food Calorie = 4,184 joules.

What is the difference between calories and kilocalories?

1 kilocalorie (kcal) = 1,000 calories (cal). Food labels use 'Calories' (capital C) which actually means kilocalories. So a 200 Calorie snack contains 200 kcal or 200,000 cal.

How do I convert kWh to joules?

One kilowatt-hour (kWh) equals 3,600,000 joules (3.6 MJ). This is because 1 kWh = 1000 watts × 3600 seconds = 3,600,000 joules. kWh is the standard unit for electricity billing.

BTU (British Thermal Unit) is the energy needed to raise 1 pound of water by 1°F. It's commonly used for heating/cooling systems. 1 BTU ≈ 1,055 joules. AC units are often rated in BTU/hour.

What is an electronvolt?

An electronvolt (eV) is the energy gained by an electron moving through 1 volt of potential. It's used in atomic and particle physics. 1 eV = 1.602 × 10⁻¹⁹ joules - an extremely small unit.

Energy Converter

Professional energy converter. Convert between joules, calories, kilocalories, kilowatt-hours, BTU, and electronvolts for physics, nutrition, and electrical calculations.

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