Calories to Kilocalories Converter
1 calorie = 0.001 kilocalories
This is the small calorie. The "Calorie" on food labels is a kilocalorie, which is 1,000 of these.
This is the unit written as "Calories" on nutrition labels.
1 calorie equals 0.001 kilocalories
How to convert calories to kilocalories
Calories here are thermochemical (4.184 J), while BTU uses the International Table definition. A kilowatt-hour is energy (3.6 MJ), not power; a food Calorie is a kilocalorie.
kcal = cal × 0.001One calorie is 0.001 kilocalories, so a single multiplication converts any value.
0.01 kcal = 10 × 0.001This is the small calorie. The "Calorie" on food labels is a kilocalorie, which is 1,000 of these.
This is the unit written as "Calories" on nutrition labels.
Calories to kilocalories conversion table
Common values in calories, converted to kilocalories.
| Calories (cal) | Kilocalories (kcal) |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1,000 | 1 |
About these units
caloriecal
The thermochemical calorie: exactly 4.184 joules.
Reference: NIST Special Publication 811.
kilocaloriekcal
One thousand thermochemical calories: exactly 4,184 joules.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.