Convert BTU to calories and calories to BTU instantly. Bidirectional energy converter with formula and common values.
Multiply the BTU value by 251.996 to get calories. Both BTU and calories are traditional heat units, with BTU dominant in US industry and calories used in scientific contexts and nutrition.
| BTU | Calories |
|---|---|
| 2 | 503.99 |
| 5 | 1,259.98 |
| 12 | 3,023.95 |
| 25 | 6,299.90 |
| 50 | 12,599.8 |
| 100 | 25,199.6 |
| 500 | 125,998 |
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One BTU equals approximately 251.996 calories (small calories). This makes BTU roughly 252 times larger than a single calorie.
Multiply the BTU value by 251.996. For example, 3.5 BTU × 251.996 = 881.99 calories.
These are thermochemical (small) calories, not food Calories. One food Calorie (kcal) equals 1,000 small calories, so 1 BTU = about 0.252 food Calories.
This conversion bridges US thermal engineering (BTU) and scientific energy measurements (calories). It appears in chemistry, thermodynamics, and cross-system engineering calculations.