Psychrometric Calculator

Solve a browser-local moist-air state from dry bulb + RH, dry bulb + dew point, dew point + RH, or dry bulb + wet bulb, with pressure-aware outputs.

Define the moist-air state

Choose a common pair of independent humidity inputs. Station pressure is used for wet-bulb, humidity-ratio, enthalpy and specific-volume estimates.

Input pair

Display temperature

Dry-bulb temperature

Relative humidity (%)

Station pressure (hPa)

Quick state

This is a compact psychrometric calculator, not a replacement for a calibrated psychrometer or a full standards-based HVAC design package. Formula approximations and pressure assumptions are shown rather than hidden.

Psychrometric Calculator Dew Point Relative Humidity Absolute Humidity Wet Bulb

Calculated properties

—Dry bulb

—Relative humidity

—Dew point

—Wet bulb

One moist-air state, several related properties

Relative humidity, dew point, wet bulb, vapor pressure, absolute humidity and humidity ratio describe different parts of the same moisture state. WebToolArc keeps the selected inputs visible and shows related outputs together instead of treating the terms as interchangeable.

Accuracy boundary

These browser calculations use standard psychrometric approximations. Real measurements can differ because of sensor calibration, station pressure, ventilation, radiation, local gradients and the exact saturation-vapor-pressure formulation. Use calibrated instruments and applicable engineering or meteorological standards when decisions require certified measurements.