Calorie to Kilocalorie Converter
Energy · unit-converter
Convert Calorie to Kilocalorie with fixed input and output units, a step-by-step formula line, and reference tables. Factors are joule-based; food energy uses thermochemical calories. The full Energy Converter also includes MMBtu, toe, thermal kWh, and MeV/GeV.
Calculator
From: Calorie (cal)
To: Kilocalorie (kcal)
About Calorie
The small calorie (cal) is 4.184 J in this converter (thermochemical). Do not confuse with the dietary kilocalorie (kcal).
About Kilocalorie
The kilocalorie (kcal) is 1,000 calories in the nutrition sense—often labeled “Calorie” on food packaging. Here 1 kcal = 4,184 J (thermochemical calorie definition used in this tool).
How to convert calories to kilocalories
1 calorie is equal to 0.001 kilocalorie when both are expressed in joule-equivalents:
1 cal = (4.184 J ÷ 4,184 J) kcal = 0.001 kcal
Each calorie is defined as 4.184 J and each kilocalorie as 4,184 J in this tool, so one cal equals 4.184 ÷ 4,184 kcal = 0.001 kcal.
Let d(cal) be the numeric amount in Calorie (cal), and d(kcal) the amount in Kilocalorie (kcal). Then:
d(kcal) = d(cal) × (4.184 / 4,184)
Equivalently, divide by how many cal fit into one kcal (joules per kcal divided by joules per cal):
d(kcal) = d(cal) ÷ 1000
Or: kilocalorie = calorie ÷ 1000
Examples
Example #1: Convert 1 cal to kilocalorie
1 cal = 1 cal × (4.184/4,184) kcal = 0.001 kcal
1 cal = 1 cal ÷ 1000 = 0.001 kcal
Example #2: Convert 10 cal to kilocalorie
10 cal = 10 cal × (4.184/4,184) kcal = 0.01 kcal
10 cal = 10 cal ÷ 1000 = 0.01 kcal
Summary
To convert Calorie to Kilocalorie, multiply the value in cal by the ratio of joules per cal divided by joules per kcal. Equivalently: value_kcal = value_cal × (4.184 / 4184). Numerically, 1 cal equals 0.001 kcal.
Relationship context
Both units are food / nutrition energy (calories). Conversions use fixed joule factors, so results stay consistent with the definitions in this converter. The factor from Calorie to Kilocalorie is 1.000000e-3 (1 cal = 0.001 kcal).
Conversion tables
| Calorie (cal) | Kilocalorie (kcal) |
|---|---|
| 0.1 | 0.0001 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 6 | 0.006 |
| 7 | 0.007 |
| 8 | 0.008 |
| 9 | 0.009 |
| Calorie (cal) | Kilocalorie (kcal) |
|---|---|
| 10 | 0.01 |
| 20 | 0.02 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 60 | 0.06 |
| 70 | 0.07 |
| 80 | 0.08 |
| 90 | 0.09 |
| 100 | 0.1 |