Professional-grade MEP calculators. No login required. Use them as often as you need.
Calculate duct size based on CFM, velocity, or friction rate using equal friction or velocity reduction methods.
Size water pipes based on flow rate and velocity limits per ASHRAE guidelines.
Convert between CFM, BTU/hr, and tons of cooling. Calculate supply air requirements.
Calculate air properties: humidity ratio, enthalpy, dew point, and wet bulb temperature.
Download standalone desktop versions with additional features. No license required.
ASHRAE-accurate psychrometric calculator with 7 input methods, two-point comparison, air mixing, and chart export.
Download PsychChart ProRound, rectangular, and flat oval duct sizing with CFM per diffuser calculator, round-to-5 balancing, SMACNA table, and constrained sizing.
Download DuctSizer Pro