TECHNICAL TOOLS
Humidity calculations that show the method, inputs, and limits
Use the first three tools to calculate dew point, distinguish common moisture-content units, and compare a measured surface temperature with the air dew point.
Each result keeps the units and assumptions visible. These tools support an early technical review; they do not replace site measurements, load calculations, or final equipment selection.
FIRST RELEASE
Three calculations for defining the moisture problem
01
Dew-point calculator
Calculate water-vapour partial pressure and dew/frost-point temperature from dry-bulb temperature and relative humidity.
Inputs: dry-bulb temperature, relative humidity Open tool → 02Moist-air property converter
Convert one measured air state into vapour density, humidity ratio, specific humidity, vapour pressure, dew point, and enthalpy.
Inputs: temperature, relative humidity, pressure or altitude Open tool → 03Surface condensation risk check
Compare surface temperature with nominal and uncertainty-adjusted dew point, then test a project-defined temperature margin.
Inputs: air state, surface temperature, instrument uncertainty, project margin Open tool →CALCULATION BASIS
The result is useful only when its definitions remain clear
ASHRAE psychrometrics
Saturation vapour pressure uses the water and ice equations in ASHRAE Handbook—Fundamentals, Chapter 1. Dew point is solved iteratively from vapour pressure.
SI units with explicit pressure
Vapour density is reported in g/m³. Humidity ratio is reported in g water/kg dry air. Pressure-dependent results use measured local pressure or standard-atmosphere pressure from altitude.
Uncertainty remains visible
The condensation tool can use temperature and RH uncertainty to calculate a conservative temperature margin instead of treating sensor readings as exact.
Defined engineering boundary
The tools do not model transient heat transfer, infiltration, moisture generation, thermal bridges, controls, weather extremes, or equipment capacity.
REFERENCES
Public calculation references
PROJECT APPLICATION
Need to turn the calculation into an equipment requirement?
Share the measured conditions, target, enclosure or room geometry, moisture sources, airflow, installation limits, and operating cycle.
Discuss the operating conditions