# Combined Gas Law Calculator

> Solve the combined gas law equation (P1·V1)/T1 = (P2·V2)/T2 for pressure, volume, or temperature.

**URL:** https://www.calculatoranswers.com/combined-gas-law-calculator
**Category:** Education

## Quick Answer

Solve the combined gas law equation (P1·V1)/T1 = (P2·V2)/T2 for pressure, volume, or temperature. Leave one field blank to solve for the missing variable.

## Definition

The combined gas law combines Boyle's law, Charles's law, and Gay-Lussac's law into a single relationship: (P1·V1)/T1 = (P2·V2)/T2. It states that the ratio of the product of pressure and volume to absolute temperature is constant for a fixed amount of gas. A combined gas law calculator solves for any of these six variables when the other five are provided. It is a fundamental thermodynamic tool in chemistry and physics.

## How to Use

1. **Enter known variables** — Input the five known values for pressure, volume, and temperature for state 1 and state 2.
2. **Select units** — Ensure corresponding variables share units (e.g. both pressures in atm, both volumes in L, and temperatures in Kelvin).
3. **Leave one blank and solve** — Leave the variable you want to solve for blank. The calculator will compute the missing value.

## Disclaimer

This calculator provides estimates for educational and planning purposes. Always consult a qualified professional for specific advice on financial, medical, legal, or other regulated decisions.

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