Charles's law calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
V₁ ÷ T₁ = V₂ ÷ T₂
Where this usually goes wrong
Temperature in KELVIN. Using Celsius here is the single most common mistake in gas law questions — add 273.15 first.
Worked example
Double the kelvin temperature and 2 L becomes 4 L.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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