Convert Btu (IT) per Pound per °C to Calories (IT) per Gram per °C
Btu (IT) per Pound per °C (Btu/(lb·°C)) to Calorie (IT) per Gram per °C (cal/(g·°C)) specific heat capacity conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 Btu/(lb·°C) = 0.55555556 cal/(g·°C)
1 Btu (IT) per Pound per °C = 0.55555556 Calories (IT) per Gram per °C
1 Calorie (IT) per Gram per °C = 1.8 Btu (IT) per Pound per °C
1 Btu/(lb·°C) in every supported unit
Conversion chart: Btu (IT) per Pound per °C to Calories (IT) per Gram per °C
Conversion table
| Btu (IT) per Pound per °C (Btu/(lb·°C)) | Calorie (IT) per Gram per °C (cal/(g·°C)) |
|---|---|
| 0.01 Btu/(lb·°C) | 0.0055555556 cal/(g·°C) |
| 0.1 Btu/(lb·°C) | 0.055555556 cal/(g·°C) |
| 1 Btu/(lb·°C) | 0.55555556 cal/(g·°C) |
| 2 Btu/(lb·°C) | 1.1111111 cal/(g·°C) |
| 3 Btu/(lb·°C) | 1.6666667 cal/(g·°C) |
| 5 Btu/(lb·°C) | 2.7777778 cal/(g·°C) |
| 10 Btu/(lb·°C) | 5.5555556 cal/(g·°C) |
| 20 Btu/(lb·°C) | 11.111111 cal/(g·°C) |
| 50 Btu/(lb·°C) | 27.777778 cal/(g·°C) |
| 100 Btu/(lb·°C) | 55.555556 cal/(g·°C) |
| 1000 Btu/(lb·°C) | 555.55556 cal/(g·°C) |
Btu (IT) per Pound per °C (Btu/(lb·°C))
Definition: A mixed-unit specific heat capacity combining the US customary pound and Btu with the metric Celsius degree, reflecting a temperature-difference unit larger than Fahrenheit's.
History: Emerged in international engineering documentation that mixes US customary mass and energy units with metric temperature reporting, common in globally traded equipment specifications.
Current use: Occasionally seen in international equipment datasheets and technical specifications that blend US customary and metric conventions.
Calorie (IT) per Gram per °C (cal/(g·°C))
Definition: The classic calorimetry unit — the calorie was originally DEFINED as the energy needed to raise one gram of water by one degree Celsius, making water's specific heat capacity almost exactly 1 cal/(g·°C) by construction.
History: Rooted in 19th-century calorimetry experiments that established the calorie as a heat-energy unit directly tied to water's thermal behavior, later refined into the precisely defined International Table calorie.
Current use: Still widely used in chemistry, nutrition science, and everyday explanations of heat capacity, precisely because water's value of very nearly 1 makes the unit intuitive to work with.
Supported Units
| Unit | Symbol | In J/(kg·K) |
|---|---|---|
| Joule per Kilogram per Kelvin | J/(kg·K) | 1 J/(kg·K) |
| Kilojoule per Kilogram per Kelvin | kJ/(kg·K) | 1000 J/(kg·K) |
| Joule per Gram per °C | J/(g·°C) | 1000 J/(kg·K) |
| Calorie (IT) per Gram per °C | cal/(g·°C) | 4186.8 J/(kg·K) |
| Kilocalorie (IT) per Kilogram per °C | kcal/(kg·°C) | 4186.8 J/(kg·K) |
| Btu (IT) per Pound per °F | Btu/(lb·°F) | 4186.8 J/(kg·K) |
| Btu (IT) per Pound per °C | Btu/(lb·°C) | 2326 J/(kg·K) |
| Kilogram-force Meter per Kilogram per Kelvin | kgf·m/(kg·K) | 9.80665 J/(kg·K) |
| Pound-force Foot per Pound per °R | lbf·ft/(lb·°R) | 5.3803205 J/(kg·K) |
About These Parameters
- Value
- The specific heat capacity value you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in — a chemistry reference's cal/(g·°C), or a US engineering datasheet's Btu/(lb·°F).
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Specific Heat Capacity Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to joules per kilogram per kelvin. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Btu (IT) per Pound per °C → Calorie (IT) per Gram per °C: multiply by 0.55555556. For example, 1 Btu/(lb·°C) × 0.55555556 = 0.55555556 cal/(g·°C).
Q = mcΔT
Specific heat capacity (c) is the key figure in the fundamental heat-energy equation Q = mcΔT — the heat energy Q needed equals mass (m) times specific heat capacity (c) times the temperature change (ΔT). This is the formula behind everything from calculating how much energy it takes to boil a kettle of water to sizing an industrial heat exchanger.
Why Water Is the Reference Point
Water has an unusually high specific heat capacity (about 4,186 J/(kg·K), or almost exactly 1 cal/(g·°C) by the calorie's original definition) compared to most other everyday materials — metals typically sit between 100 and 900 J/(kg·K). This is why large bodies of water moderate coastal climates, why water is used as a coolant in engines and power plants, and why the calorie and Btu, both originally water-based reference units, come out so close to a value of 1 on this page's water-referenced units.
Example
A specific heat capacity of 1 Btu/(lb·°C) equals 0.55555556 cal/(g·°C). For scale, water's specific heat capacity is about 4,186 J/(kg·K) (1 cal/(g·°C)), while aluminum's is about 897 J/(kg·K) — meaning it takes roughly 4.7 times more energy to heat a kilogram of water by one degree than the same mass of aluminum.
Frequently Asked Questions
How many Calories (IT) per Gram per °C are in 1 Btu (IT) per Pound per °C?
1 Btu (IT) per Pound per °C (Btu/(lb·°C)) equals exactly 0.55555556 Calories (IT) per Gram per °C (cal/(g·°C)).
Why is water's specific heat capacity almost exactly 1 cal/(g·°C)?
It's not a coincidence — the calorie was originally DEFINED in the 19th century as the energy needed to raise one gram of water by one degree Celsius. The modern International Table calorie is now fixed to a precise joule value rather than redefined by experiment each time, which is why the figure comes out extremely close to, but not perfectly, 1.
What's the difference between specific heat capacity and heat capacity?
Specific heat capacity is a per-unit-mass property of a substance (energy per kg per degree), independent of how much of the substance you have. Heat capacity (without "specific") is the total energy needed to heat a particular object or quantity by one degree, found by multiplying specific heat capacity by the actual mass involved.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally recognized relationship between the underlying energy, mass, and temperature units (e.g. 1 cal (IT) = exactly 4.1868 joules) — results are limited only by floating-point display precision, not by rounded conversion constants.