Boyle's Law Calculator

Summary

Enter any three of P1, V1, P2, V2 and instantly solve for the missing variable using Boyle's Law.

How it works

1. Enter values for three of the four variables: Initial Pressure (P1), Initial Volume (V1), Final Pressure (P2), or Final Volume (V2).
2. Leave exactly one field blank — that is the unknown the calculator will solve.
3. Select the appropriate unit for each pressure and volume field.
4. Click Calculate to apply the formula P1 × V1 = P2 × V2.
5. The result appears instantly with the solved value highlighted.
6. Click Reset to clear all fields and start a new calculation.

Use cases

• Solve chemistry homework problems involving gas pressure and volume changes.
• Predict the new volume of a gas when pressure increases in a syringe.
• Calculate the pressure needed to compress a gas to a target volume.
• Verify lab results by cross-checking measured pressure-volume pairs.
• Understand the inverse relationship between pressure and volume for ideal gases.
• Prepare for AP Chemistry or university-level gas law exams.
• Model pneumatic systems where gas is compressed or expanded.
• Convert between different pressure or volume units while solving gas law problems.

Frequently Asked Questions