The Gay-Lussac’s Law Calculator helps you determine the relationship between the pressure and temperature of a gas when the volume and amount of gas remain constant. Using the formula P₁ / T₁ = P₂ / T₂, this tool allows you to easily calculate any missing value, such as the final or initial pressure or temperature. According to Gay-Lussac’s Law, the pressure of a gas is directly proportional to its temperature (in Kelvin) — meaning when temperature increases, pressure rises, and when temperature decreases, pressure drops. This calculator is a valuable learning aid for chemistry students, teachers, and researchers who want accurate and instant results for gas law problems. It’s perfect for visualizing how gases behave under different temperature and pressure conditions.