Boyle's Law Calculator
PV constant: halve the volume, double the pressure.
Work out Boyle's Law. PV constant: halve the volume, double the pressure. Free, with no account and nothing to download.
Final volume (L)
1
2 L → 1 L
Boyle's law: at fixed temperature, PV is constant, so halving the volume doubles the pressure. It is the combined gas law with the temperature terms cancelling.
How the Boyle's Law Calculator works
At fixed temperature the product of pressure and volume is constant, so halving the volume doubles the pressure. It is the combined gas law with the temperature terms cancelling.
Also known as: p1v1 = p2v2 calculator · pressure volume calculator · boyle's law formula · inverse pressure volume relationship
Frequently asked questions
What is Boyle's law?
P₁V₁ = P₂V₂ at constant temperature. Pressure and volume are inversely proportional.
Where does it apply in practice?
Syringes, diving, and lungs. A diver's air volume halves at 10 metres because the pressure doubles, which is why ascending while holding your breath is dangerous.
Does temperature need to be constant?
Yes — that is the condition of the law. If temperature changes as well, use the combined gas law instead.
Put this calculator on your own site
Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.
<iframe src="https://www.thecalclibrary.com/embed/boyles-law-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Boyle's Law Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;margin:6px 0 0;color:#64748b">Powered by <a href="https://www.thecalclibrary.com/boyles-law-calculator" style="color:#64748b">Boyle's Law Calculator</a> from The Calc Library</p>The only condition is that the credit line below the frame stays in place. That one line is what pays for the tool being free — it is how anyone else finds it.