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Specific Heat Capacity Converter

Science

Convert specific heat capacity between joules per kilogram-Kelvin, calories per gram-°C, and BTU per pound-°F — used for thermodynamics and materials work.

Reviewed by the thecalcu.com team · Last updated July 10, 2026

From
To
All conversionsfor 1 Calories per Gram-°C (cal/g·°C)
Joules per Kilogram-Kelvin (J/kg·K)4184
Kilojoules per Kilogram-Kelvin (kJ/kg·K)4.184
Calories per Gram-°C (cal/g·°C)1
BTU per Pound-°F (BTU/lb·°F)0.99933123

What is a Specific Heat Capacity?

The Specific Heat Capacity Converter converts specific heat capacity between joules per kilogram-Kelvin (SI), calories per gram-°C (CGS), and BTU per pound-°F (imperial). Specific heat capacity measures how much energy is needed to raise a unit mass of a substance by one degree of temperature, a fundamental material property used throughout thermodynamics, calorimetry, and thermal engineering.

Enter a value in any supported unit and the converter calculates the equivalent instantly. For the related volumetric quantity, see the Heat Density Converter.

Why Use a Specific Heat Capacity Converter?

Thermodynamics references and materials datasheets report specific heat capacity in whichever unit convention matches their origin, SI-based J/kg·K from international sources, cal/g·°C from chemistry references, or BTU/lb·°F from US engineering practice. A calorimetry calculation (Q = mcΔT) requires all values in consistent units, making accurate conversion a necessary first step when combining data from different sources.

Who Should Use This Converter?

  • Thermodynamics and chemistry students converting specific heat capacity values between unit systems for calorimetry problems.
  • Materials engineers comparing thermal properties across international material datasheets.
  • Thermal and battery engineers working with specific heat capacity data for thermal mass or thermal management calculations.
  • HVAC engineers converting between metric and imperial specific heat data for heating and cooling load calculations.

What Insights Does the Specific Heat Capacity Converter Give You?

The main output is the converted value in your chosen target unit, calculated precisely from the fixed multiplier relationship between units. Because water's specific heat capacity is a widely known reference point (≈4,184 J/kg·K, or exactly 1 in cal/g·°C by definition), the converter's results are easy to sanity-check against that familiar benchmark.

How to use this Specific Heat Capacity calculator

  1. Choose your starting unit from the source dropdown, for example, "Calories per Gram-°C (cal/g·°C)".
  2. Enter the numeric value you want to convert in the input field.
  3. Choose your target unit from the destination dropdown, for example, "Joules per Kilogram-Kelvin (J/kg·K)".
  4. Read the converted result, which updates instantly as you type or change units.
  5. Use the swap (⇅) button if you need to reverse the conversion direction.
  6. Use the copy button to grab the result for a calorimetry calculation or materials comparison.
Show formula & methodology ↓Show less ↑

Formula & Methodology

The converter's base unit is joules per kilogram-Kelvin (J/kg·K). Every supported unit has a fixed multiplier:

- 1 kilojoule per kilogram-Kelvin (kJ/kg·K) = 1,000 J/kg·K
- 1 calorie per gram-°C (cal/g·°C) = 4,184 J/kg·K
- 1 BTU per pound-°F (BTU/lb·°F) = 4,186.8 J/kg·K

Any conversion follows:

Result = Input × (toBase of source unit ÷ toBase of target unit)

Worked example, converting water's specific heat capacity of 1 cal/g·°C to J/kg·K:

Result = 1 × 4184 = 4,184 J/kg·K

This matches the standard reference value for water's specific heat capacity in SI units.

Related Tools

You may also find these useful: Thermal Conductivity Converter, Energy Converter.

Frequently Asked Questions

What is specific heat capacity?
Specific heat capacity measures how much energy is needed to raise the temperature of a unit mass of a substance by one degree, a higher specific heat capacity means a substance requires more energy to heat up (or releases more energy cooling down) for the same mass and temperature change.
How do I convert cal/(g·°C) to J/(kg·K)?
Multiply the cal/(g·°C) value by 4,184, since one calorie per gram-°C equals 4,184 joules per kilogram-Kelvin. Enter your value with 'Calories per Gram-°C (cal/g·°C)' as the source and 'Joules per Kilogram-Kelvin (J/kg·K)' as the target to apply this automatically.
Why is water's specific heat capacity such a commonly cited reference value?
Water has an unusually high specific heat capacity (about 4,184 J/kg·K, or exactly 1 cal/g·°C by the calorie's original definition), meaning it takes a lot of energy to change its temperature, this is why water is used as a thermal reference standard and why large bodies of water moderate local climate temperatures.
Why are cal/(g·°C) and BTU/(lb·°F) numerically so close for water?
Both units were historically defined around water's specific heat capacity as a reference point, 1 calorie is defined as the energy to raise 1 gram of water by 1°C, and 1 BTU is defined similarly for 1 pound of water and 1°F, so both units evaluate to approximately 1 for water, and their SI equivalents (4,184 and 4,186.8 J/kg·K) are very close but not identical due to small definitional differences.
How does specific heat capacity relate to heat density?
Heat density (energy per unit volume) can be calculated from specific heat capacity (energy per unit mass) by multiplying by the substance's density, specific heat capacity is a per-mass quantity, while heat density is a per-volume quantity. See the [Heat Density Converter](/heat-density-converter/) for that related quantity.
What is a typical specific heat capacity for common materials?
Water has a specific heat capacity of about 4,184 J/kg·K, while most metals are much lower, aluminium around 900 J/kg·K, and copper around 385 J/kg·K, which is why metals heat up and cool down much faster than water for the same energy input.
Why does specific heat capacity matter for engineering thermal design?
Specific heat capacity determines how much energy storage or thermal mass a material provides, which matters for applications from building thermal mass (moderating indoor temperature swings) to battery thermal management (how much a cell's temperature rises during charging) to calculating heating or cooling loads for a process.
How do I use this converter for a calorimetry calculation?
Calorimetry calculations (Q = mcΔT) require specific heat capacity in consistent units with your mass and temperature values, use this converter to bring datasheet or reference specific heat values into the same unit system as the rest of your calculation before applying the formula.
Is specific heat capacity the same as heat capacity?
No, heat capacity is the total energy needed to raise an entire object's temperature by one degree (depends on the object's total mass), while specific heat capacity is a per-unit-mass property intrinsic to the material, independent of how much of it you have.
Why do gases sometimes have two different specific heat capacity values?
Gases have distinct specific heat capacities at constant pressure (cₚ) and constant volume (cᵥ), since heating a gas at constant pressure requires extra energy to do expansion work, always check which value a given specific heat figure refers to before using it in a calculation.
Also known as
specific heat capacity converterj/kg k to cal/g c converterbtu/lb f converterspecific heat units convertercal per gram celsius converter