How to use the saturation vapor pressure calculator
Find the maximum water vapor pressure air can hold at a given temperature. Enter air temperature in the field above; the saturation vapor pressure are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “saturation vapour pressure”, “how much vapor can air hold”, “Magnus formula”, “calculate saturation vapor pressure”, “find saturation vapor pressure”.
Formula
Variables
- T — Air temperature (°C)
Worked example
With air temperature = 25 °C, the calculator gives saturation vapor pressure ≈ 31.67429 hPa; saturation vapor pressure ≈ 3.167429 kPa.
Frequently asked questions
What is the saturation vapor pressure calculator used for?
Find the maximum water vapor pressure air can hold at a given temperature. It helps with questions such as “saturation vapour pressure”, “how much vapor can air hold”, “Magnus formula”.
What is the formula for the saturation vapor pressure calculation?
Saturation vapor pressure (hPa) = 6.112 × exp(17.67 × T / (T+243.5)). Saturation vapor pressure (kPa) = [Saturation vapor pressure] / 10. Here T is air temperature (°C).
What inputs do I need for the saturation vapor pressure calculator?
You need air temperature in °C. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the saturation vapor pressure calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the saturation vapor pressure result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.