Joules to Calories Converter
J → cal · ⚡ Energy
1 Joules = 0.23900574 Calories
How to convert Joules to Calories
To convert Joules to Calories, multiply the value in Joules by 0.23900574. For example, 5 J = 1.1950287 cal.
Going from Joules to Calories means applying a fixed conversion factor: one Joules (J) is exactly 0.23900574 Calories (cal). Type any number into the converter above and the equivalent updates instantly, or use the reference table for quick lookups.
Energy conversions appear in nutrition, fitness, physics, utility bills, and engineering. The same quantity of energy can be expressed in joules, calories, kilowatt-hours, or BTU depending on the context.
Understanding Joules and Calories
The joule is the SI unit, but everyday contexts use others: food labels use kilocalories (often just called 'calories'), electricity bills use kilowatt-hours, and heating and cooling systems use BTU (British Thermal Units). One food calorie is actually a kilocalorie — 1,000 of the small physics calories — which is a frequent source of confusion.
How accurate is this conversion?
Energy conversions use standard definitions: 1 calorie = 4.184 joules, 1 kilowatt-hour = 3,600,000 joules, 1 BTU = 1,055.06 joules. These are internationally agreed values, making the conversions exact.
All conversion factors on ClearUnits are based on internationally recognised standards (the International System of Units, SI, and official definitions). Factors are reviewed for accuracy and the calculator uses full-precision values, rounding only the displayed result.
Quick reference: common Joules to Calories values
The most frequently searched conversions are 1 Joules = 0.23900574 Calories, 5 Joules = 1.1950287 Calories, 10 Joules = 2.3900574 Calories, and 100 Joules = 23.900574 Calories. The full table further down covers every common value, and the calculator handles any number you need in between.
Pro tip: When comparing appliance efficiency or heating costs, convert everything to kilowatt-hours first, since that's the unit your utility bill uses — it makes the real-world cost immediately comparable.
Joules to Calories — Conversion Table
| Joules (J) | Calories (cal) |
|---|---|
| 0.1 J | 0.023900574 cal |
| 0.25 J | 0.059751434 cal |
| 0.5 J | 0.11950287 cal |
| 1 J | 0.23900574 cal |
| 2 J | 0.47801147 cal |
| 5 J | 1.1950287 cal |
| 10 J | 2.3900574 cal |
| 25 J | 5.9751434 cal |
| 50 J | 11.950287 cal |
| 100 J | 23.900574 cal |
| 250 J | 59.751434 cal |
| 500 J | 119.50287 cal |
| 1000 J | 239.00574 cal |