Specific Heat Calculator (Q = mcΔT)
Calculate the heat energy transferred when a substance changes temperature using Q = mcΔT — the fundamental calorimetry equation.
How to use this specific heat calculator
- 1Enter the mass of the substance in grams.
- 2Enter the specific heat capacity (see the help text for common values).
- 3Enter ΔT = final temperature minus initial temperature.
- 4Negative ΔT means cooling — Q will be negative (heat released).
How it's calculated
Q = m × c × ΔT. Joules = grams × J/(g·°C) × °C. 1 cal = 4.184 J. Positive Q = substance absorbed heat; negative Q = heat released.
About the Specific Heat Calculator
Q = mcΔT is the cornerstone of calorimetry — the science of measuring heat flow. Water's remarkably high specific heat (4.184 J/g·°C) has enormous consequences: it moderates Earth's climate, makes blood an effective heat carrier, and makes water-based cooling systems uniquely efficient.
By contrast, metals have low specific heats. Gold (0.129 J/g·°C) heats 32× faster than water per gram — useful in jewelry (doesn't store heat you feel) but dangerous in cookware.
Frequently asked questions
Why is water's specific heat so high?
Water's specific heat (4.184 J/g·°C) is unusually high due to hydrogen bonding. It buffers temperature — used as a coolant in engines, and why coastal climates are mild.
What's the difference between cal and Cal?
A calorie (cal) raises 1g of water by 1°C. A dietary Calorie (Cal = kcal) is 1000 cal. '100 Calories' in food = 418,400 J of chemical energy.
How do I find specific heat experimentally?
Calorimetry: heat the substance, drop it into water, measure temperature change of water. c_substance = (m_water × 4.184 × ΔT_water) ÷ (m_substance × |ΔT_substance|).