Boiling Point Calculator

Use the Clausius–Clapeyron relation to determine the boiling point of any substance at a given pressure.

Enter all the known values. Select the proper units for your inputs and the units you want to get the calculated unknowns in and press Solve.

  • ln(P1/P2) = -Hvap/R * (1/T1 - 1/T2)
J mol-1
J K−1 mol−1