Boyle's Law Calculator

For a sealed, fixed amount of gas at constant temperature, pressure and volume are inversely proportional, so P1 x V1 = P2 x V2. Squeeze the volume in half and the pressure doubles.

Any units, provided both pressures share one unit and both volumes share another. Because the law is a ratio of products, atmospheres with litres or pascals with cubic metres all give the same answer.

Boyle's Law isolates the pressure-volume relationship by holding temperature and the amount of gas fixed. If the temperature changes during the process, the combined gas law or ideal gas law is the correct tool.

Three of the four. The Solve for dropdown empties the quantity you want, and the calculator solves for it; supplying fewer than three known values returns an error.

A confined gas always has positive pressure and positive volume, so every input must be greater than zero. The engine flags any zero or negative value instead of producing a nonsensical result.

Plotting pressure against volume traces a hyperbola: as one rises the other falls so their product stays constant. That constant product is what the calculator preserves when it solves for the missing term.

The ideal gas law PV = nRT reduces to Boyle's Law when the amount of gas and the temperature are constant, leaving P and V free to vary. Boyle's Law is one face of the fuller ideal gas relationship.

The result is exact for an ideal gas. Real gases follow it closely at moderate pressures but drift at very high pressure or near condensation, where molecular volume and attractions matter; use a real-gas equation for those regimes.

No. Every calculation is done on your device in JavaScript, so the pressures and volumes you type are never uploaded.