STP Calculator (Standard Temperature and Pressure)
Use this STP calculator to convert a measured gas sample to standard conditions, estimate the number of moles present, and compare the molar volume under common STP definitions.
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Quick Answer: At standard temperature and pressure, gas calculations typically use n = PV / RT and Vstp = V x (Tstp / T) x (P / Pstp). Under the common 0 °C and 1 atm convention, one mole occupies about 22.414 L.