๐จGas Law Calculator
Solve before/after two-state gas problems โ pick your law and enter the known values.
Use this for before/after two-state problems at held-constant conditions. For relating P, V, n, and T directly with a single state, use the Ideal Gas Law Calculator instead.
Free Gas Law Calculator
Working through a before-and-after gas problem โ pressure changing at constant temperature, or volume changing as temperature rises? Our free gas law calculator covers Boyle's, Charles's, Gay-Lussac's, Avogadro's, and the Combined Gas Law in one place. Pick the law that matches your held-constant conditions, enter your known state 1 and state 2 values, and solve for whatever's missing.
All common pressure, volume, and temperature units are supported with automatic conversion, and temperature is always checked against absolute zero. Every answer comes with the specific law's formula shown, rearranged and substituted with your numbers.
Built for chemistry and physics coursework, it runs entirely in your browser. No sign-up, no downloads, no limits.