Convert Kilocalorie to Calorie (kcal → cal)
The kilocalorie (called Calorie on US food labels) measures dietary energy in nutrition worldwide.
Kilocalorie to Calorie Conversion Table
10 common values| Kilocalorie | Calorie |
|---|---|
| 1 kcal | 1,000 cal |
| 10 kcal | 10,000 cal |
| 100 kcal | 100,000 cal |
| 500 kcal | 500,000 cal |
| 1,000 kcal | 1,000,000 cal |
| 5,000 kcal | 5,000,000 cal |
| 10,000 kcal | 10,000,000 cal |
| 50,000 kcal | 50,000,000 cal |
| 100,000 kcal | 100,000,000 cal |
| 500,000 kcal | 500,000,000 cal |
How to Convert Kilocalorie to Calorie Manually
Step by StepConverting kilocalories to calories is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in kilocaloriesStart with the number of kilocalories (kcal) you want to convert.
- 2Multiply by 1,000The conversion factor from kcal to cal is 1,000. Multiply your value by this number.
- 3Read the result in caloriesThe result is your value in calories (cal).
Formula
Multiply the value in kilocalories by 1,000. For the reverse direction, multiply by 0.001.
cal = kcal × 1,000kcal = cal × 0.001Tips
Use these in everyday conversions- 1 kcal = 4.184 kJ.
- US "Calorie" (with capital C) = 1 kcal.
- Apps and smartwatches track active energy in kcal.
Common Mistakes
Avoid these- Reading food "Calories" as gram calories — factor of 1000 off.
- Treating all calorie values as comparable — macros (fat, protein, carb) differ in energy density.
- Counting kcal without portion size leads to underestimates.
About Kilocalorie and Calorie
What is the Kilocalorie?
The kilocalorie equals 1,000 small calories or exactly 4.184 kilojoules and is the universal unit for measuring dietary energy in food. Confusingly, on US food labels and in popular usage, 'Calorie' (capital C) means kilocalorie — so a 200-Calorie cookie is actually 200,000 small calories, or 200 kcal. This convention dates to American chemist Wilbur Atwater's 19th-century nutrition research. Recommended daily intake is roughly 2,000 kcal for women and 2,500 kcal for men. The kilocalorie remains the everyday food-energy unit in the United States, while European labels show both kJ and kcal. Athletes track caloric burn during exercise in kcal: running burns about 100 kcal per mile. The kcal relates to the kilojoule (4.184 kJ = 1 kcal), the joule (1 kcal = 4,184 J), and the BTU (1 BTU ≈ 0.252 kcal). Marathon runners burn roughly 2,600 kcal during a 42-km race.
- Nutrition labels worldwide
- Diet and weight-management tracking
- Dietetics and clinical nutrition
Adult daily intake: ~2000 kcal. Banana: 90 kcal. Big Mac: 550 kcal. 30 min running: ~300 kcal burned.
What is the Calorie?
The calorie equals exactly 4.184 joules (the 'thermochemical calorie') and is the historical unit for heat in chemistry and physics. It was originally defined as the heat needed to raise 1 gram of water by 1°C (a definition that varied slightly with starting temperature, hence multiple 'calories' — 4.184 J was set as the exact thermochemical convention). The calorie is widely used in older physics and chemistry literature for reaction energies, specific heat capacities, and thermodynamic calculations. Note: this 'small calorie' (lowercase c) is 1/1000 of the food Calorie (capital C) used in nutrition. The chemistry calorie relates to the joule (4.184 J = 1 cal), the kilocalorie (1,000 cal = 1 kcal = 1 food Calorie), and the BTU (1 BTU ≈ 252 cal). Modern SI usage in scientific publications has largely replaced the calorie with the joule, but it persists in medical and chemistry contexts.
- Thermodynamics and older physics texts
- Chemistry energy calculations
- Some engineering heat-transfer contexts
Raising 1 g of water 1 °C: 1 cal. A 100 kcal snack = 100,000 small calories.