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Energy Converter

Convert between energy units: joules, calories, watt-hours, BTU, and more.

4184

1 kilocalorie = 4184 joule

How to Use Energy Converter

1

Select energy units

Choose the source and target energy units from the dropdown menus. All common energy and heat units are available.

2

Enter the energy value

Type the energy amount you want to convert. The result updates instantly in real time as you type.

3

Copy or swap the result

Copy the converted energy value to your clipboard, or click swap to reverse the conversion direction.

About Energy Converter

Energy converter online — convert joules to calories, BTU to kilowatt-hours, and between all energy measurement units instantly for free. Supports joules, kilojoules, calories, kilocalories (food calories), BTU, kilowatt-hours, watt-hours, electron volts, and foot-pounds with high precision. Ideal for physics homework, nutrition label conversions, HVAC calculations, and electricity bill analysis. No signup, no ads — runs entirely in your browser.

Key Features

  • Convert between all common energy units including joules, kilojoules, calories, kilocalories, BTU, kWh, and electron volts
  • Real-time bidirectional conversion updates results instantly as you type any energy value
  • Differentiates between food calories (kcal) and scientific calories (cal) to avoid confusion
  • High precision calculations with multiple decimal places for physics, nutrition, and engineering
  • One-click unit swap to quickly reverse energy conversion direction between any two units
  • 100% free and private — all energy calculations happen in your browser with no data collection

Frequently Asked Questions

How to convert joules to calories online?▾
Enter the joules value and select calories as target. 1 joule equals approximately 0.2390 calories. For food calories (kcal), divide by 4,184.
How to convert BTU to kilowatt-hours?▾
Select BTU as source and kWh as target. 1 BTU equals approximately 0.000293 kWh. Common for HVAC and heating system calculations.
How to convert calories to joules?▾
Enter the calorie value and select joules. 1 calorie equals exactly 4.184 joules. Used in physics and chemistry calculations.
How to convert kilocalories to calories?▾
1 kilocalorie (kcal) equals exactly 1,000 calories. Food nutrition labels list energy in kcal, often misleadingly labeled as "calories."
How to convert kWh to joules?▾
Select kWh as source and joules as target. 1 kWh equals 3,600,000 joules. Useful for understanding electricity consumption in scientific terms.
How to convert BTU to calories?▾
Enter the BTU value and select calories. 1 BTU equals approximately 252 calories. Common for comparing heating and cooling energy ratings.
How to convert electron volts to joules?▾
Select eV as source and joules as target. 1 eV equals approximately 1.602 × 10⁻¹⁹ joules. Used in particle physics and quantum mechanics.
How to understand food calories vs scientific calories?▾
Food "calories" are actually kilocalories (kcal). 1 food calorie = 1 kcal = 1,000 scientific calories = 4,184 joules. Our converter handles both correctly.