Specific Heat Capacity Converter
Convert between specific heat capacity units — joules per kilogram-kelvin, calories per gram-°C, kilocalories per kilogram-°C, and Btu per pound-°F.
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 cal/(g·°C) = 4186.8 J/(kg·K)
1 Calorie (IT) per Gram per °C = 4186.8 Joules per Kilogram per Kelvin
1 Joule per Kilogram per Kelvin = 0.0002388459 Calories (IT) per Gram per °C
1 cal/(g·°C) in every supported unit
What is a Specific Heat Capacity Converter?
Specific heat capacity measures how much energy it takes to raise one unit of a substance's mass by one degree of temperature — it's why a metal spoon in a hot drink heats up almost instantly while the water around it stays warm far longer: water has an unusually HIGH specific heat capacity, while metals have a low one. This converter translates a specific heat reading from one unit into another, so a chemistry textbook's cal/(g·°C), a physics paper's J/(kg·K), and a US engineering datasheet's Btu/(lb·°F) can all be compared directly.
Every unit here is defined relative to the SI joule-per-kilogram-per-kelvin unit by a fixed multiplier — and, not by coincidence, several of these units were historically DEFINED so that water's specific heat capacity comes out to almost exactly 1 in that unit, since water was the original 19th-century calorimetry reference substance.
Conversion chart: Calorie (IT) per Gram per °C to Joules per Kilogram per Kelvin
Conversion table
| Calorie (IT) per Gram per °C (cal/(g·°C)) | Joule per Kilogram per Kelvin (J/(kg·K)) |
|---|---|
| 0.01 cal/(g·°C) | 41.868 J/(kg·K) |
| 0.1 cal/(g·°C) | 418.68 J/(kg·K) |
| 1 cal/(g·°C) | 4186.8 J/(kg·K) |
| 2 cal/(g·°C) | 8373.6 J/(kg·K) |
| 3 cal/(g·°C) | 12560.4 J/(kg·K) |
| 5 cal/(g·°C) | 20934 J/(kg·K) |
| 10 cal/(g·°C) | 41868 J/(kg·K) |
| 20 cal/(g·°C) | 83736 J/(kg·K) |
| 50 cal/(g·°C) | 209340 J/(kg·K) |
| 100 cal/(g·°C) | 418680 J/(kg·K) |
| 1000 cal/(g·°C) | 4186800 J/(kg·K) |
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 Calorie (IT) per Gram per °C → Joule per Kilogram per Kelvin: multiply by 4186.8. For example, 1 cal/(g·°C) × 4186.8 = 4186.8 J/(kg·K).
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 cal/(g·°C) equals 4186.8 J/(kg·K). 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
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.