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Humidity Vapor Pressure Deficit Calculator

Humidity Vapor Pressure Deficit Calculator uses measurements of air temperature (°c), relative humidity (%) to answer a specific numerical planning question. Enter the figures for your own scenario and review the primary output in kPa. Formula: Vapor pressure deficit kPa = 0.6108 exp(17.27T/(T + 237.3)) × (1 − RH/100). The saturation pressure approximation is intended for normal environmental temperatures.

How to use this calculator

  1. Start by confirming the unit and value of air temperature (°c).
  2. Enter relative humidity (%) using compatible units. Do not enter formatted numbers with commas.
  3. Review the calculated kPa figure, then compare the assumption and limitations against your scenario.

Formula used for humidity vapor pressure deficit calculator

Vapor pressure deficit kPa = 0.6108 exp(17.27T/(T + 237.3)) × (1 − RH/100).

  • The calculator uses only the entered quantities and applies this defined relationship to report kPa. It does not collect personal information or fetch remote measurements.
  • To reproduce a result, use the same input values, precision and units. The default example demonstrates the arithmetic, not a recommended target. The saturation pressure approximation is intended for normal environmental temperatures.

Worked examples

Example calculation for Humidity Vapor Pressure Deficit Calculator

For illustration, assume Air temperature (°C) = 25, Relative humidity (%) = 60.

Calculate using: Vapor pressure deficit kPa = 0.6108 exp(17.27T/(T + 237.3)) × (1 − RH/100).

The estimated result is 1.267111 kPa.

Understanding the result

With the example inputs, the formula gives approximately 1.267111 kPa. This is a modeled quantity rather than a verified real-world outcome.

The saturation pressure approximation is intended for normal environmental temperatures.

Important notes

The saturation pressure approximation is intended for normal environmental temperatures.

This output is only as reliable as the measurements and assumptions you entered. Verify air temperature (°c) and all units against the relevant product datasheet, project plan, instrument reading or official requirements.

Frequently asked questions

What does this humidity vapor pressure deficit calculator calculate?

It calculates a result in kPa from air temperature (°c), relative humidity (%). Vapor pressure deficit kPa = 0.6108 exp(17.27T/(T + 237.3)) × (1 − RH/100).

What could make this humidity vapor pressure deficit calculator inaccurate?

The saturation pressure approximation is intended for normal environmental temperatures.

How should I check my humidity vapor pressure deficit calculator result?

Confirm the input definitions and units, recompute the provided example and compare with a real measurement when available. The saturation pressure approximation is intended for normal environmental temperatures.

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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.