Specific Heat Calculator

How it is calculated

The tool multiplies three numbers: Q = m × c × ΔT, where m is the mass, c is the specific heat capacity and ΔT is the temperature change (final minus initial). The result is labelled in joules, so the units must match: mass in kg with c in J/(kg·K), or mass in g with c in J/(g·K). A change of 1 °C equals a change of 1 K.

The tool does no unit conversion and applies no checks beyond requiring all three numbers. A negative ΔT, a cooling, gives a negative Q, meaning heat is released. It assumes c stays constant over the temperature range and ignores phase changes such as melting or boiling, where extra latent heat is involved. It also ignores heat lost to the container or surroundings.

Common mistakes

• Mixing grams with a per-kilogram specific heat, or the reverse. 2000 g with 4186 J/(kg·K) gives a result 1000 times too large.
• Entering the final temperature instead of the change. ΔT is final minus initial, so heating from 15 to 35 °C is 20, not 35.
• Entering the sign of ΔT the wrong way round. Heating is positive and cooling is negative, which changes the sign of Q.
• Using this for a substance that melts or boils within the range. The formula covers only temperature change; it leaves out the energy of the phase change.
• Using the specific heat of one material for another. Water and metals differ by a large factor, so use the value for your substance.