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.
Distributes total airflow across N diffusers in clean 5-CFM increments so the total stays on target.
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 ProPlumbing fixture calculator with Hunter's Curve interpolation. IPC 2024, IPC 2021, UPC 2021, and CPC 2022 support. 28 fixture types, 8 building presets, and Revit JSON import.
Download PlumbingCalc ProStandalone 3D viewer for BIM models — VTK 9 PBR + HDR image-based lighting + screen-space ambient occlusion. Loads IFC / glb / obj / stl. Section box, WASD navigation, calc-result overlays, camera bookmarks. 4 GB VRAM recommended.
Download Viewer3D Pro