What is the difference between a calorie and a kilocalorie?

A kilocalorie (kcal) is 1,000 calories. Food 'Calories' (capital C) are actually kilocalories. 1 kcal = 4,184 joules.

How many joules are in a kWh?

1 kilowatt-hour = 3,600,000 joules (3.6 MJ).

A British Thermal Unit is the energy needed to raise 1 pound of water by 1 degree Fahrenheit. 1 BTU = 1,055.06 joules.

Energy Converter

Convert between joules, calories, kWh, BTU, and more. Free energy unit converter.

energy converterjoules to calorieskwh converterbtu to joules

Common Use Cases

switching between common measurement systems
cross-checking units for school, work, or travel
avoiding manual conversion mistakes

What is Energy Converter?

The Energy Converter converts between joules, kilojoules, calories, kilocalories (food calories), watt-hours, kilowatt-hours, electronvolts, British Thermal Units (BTU), therms, and foot-pounds. Used in physics, nutrition, electrical engineering, HVAC, and energy industry calculations.

How to Use This Tool

1Select the source and target energy units
2Enter the energy value
3See the converted result instantly

Example

Input

1 kilocalorie

Output

4,184 joules

Before You Rely on This Result

UtilityNest keeps this tool simple on purpose: the goal is to make the task easy to understand, fast to complete, and straightforward to double-check.

Review the inputs once more before you copy, save, or share the result.
Use the example and FAQ on this page to sense-check how the tool behaves.
When the result matters, compare one more scenario or related tool before acting on it.

Frequently Asked Questions

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