Calories to Btu
1 calorie = 0.00396565 btu (BTU)
Convert calories to btu instantly. 1 calorie = 0.00396565 btu. Free, accurate, with conversion table and formula.
Calorie (cal)
BTU (BTU)
| Unit | 1 cal equals |
|---|---|
| Joule (J) | 4.184 |
| Kilojoule (kJ) | 0.004184 |
| Calorie (cal) | 1 |
| Kilocalorie (kcal) | 0.001 |
| Watt Hour (Wh) | 0.00116222 |
| Kilowatt Hour (kWh) | 0.00000116222 |
| BTU (BTU) | 0.00396565 |
| Electron Volt (eV) | 2.61145e+19 |
| Foot-Pound (ft·lb) | 3.08596 |
How to convert calories to btu
- 1Take your value in calories (cal).
- 2Multiply by 0.00396565.
- 3The result is your value in btu (BTU).
Calories to Btu conversion table
| Calories (cal) | Btu (BTU) |
|---|---|
| 1 | 0.00396565 |
| 2 | 0.0079313 |
| 5 | 0.0198283 |
| 10 | 0.0396565 |
| 25 | 0.0991413 |
| 50 | 0.198283 |
| 100 | 0.396565 |
| 250 | 0.991413 |
| 500 | 1.98283 |
| 1,000 | 3.96565 |
Frequently asked
How many btu are in a calorie?
1 calorie equals 0.00396565 btu (BTU).
How do I convert calories to btu?
Multiply the number of calories by 0.00396565 to get btu.
What is 10 calories in btu?
10 cal equals 0.03966 BTU.
What is 100 calories in btu?
100 cal equals 0.3966 BTU.
How do I convert btu back to calories?
Multiply btu by 252.165 (the reciprocal) or use the swap button above.
Where you'll actually use this
Energy converters bridge joules, calories, kilowatt-hours, BTUs, and electron-volts — the same physical quantity expressed for science, nutrition, electricity, or HVAC.
- Electricity bills
Usage is billed in kWh. Convert to joules for physics, or to BTU for HVAC comparisons.
- Nutrition
Food 'calories' are actually kilocalories (kcal). 1 kcal = 4,184 J. EU labels list both kcal and kJ.
- HVAC & cooling
Air conditioner output is quoted in BTU/h in the US, watts elsewhere.
Common mistakes to avoid
- Calories vs kilocalories
When a food label says '250 calories' it really means 250 kcal = 250,000 small calories.
- kW vs kWh
kW is power (rate); kWh is energy (total). A 1 kW heater running for 2 hours uses 2 kWh.
Did you know?
A typical modern fridge uses about 1 kWh per 24 hours — roughly $0.10–$0.30 depending on local rates.
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