McQuay Pipe Sizer – Free Download

About McQuay Pipe Sizer

McQuay Pipe Sizer (now part of Daikin) is a free, lightweight Windows tool for sizing hydronic piping — chilled water, hot water and condenser water — by target velocity or friction rate (pressure drop). Enter the flow rate (GPM or L/s), choose a velocity or friction limit, and it instantly returns the pipe diameter, actual velocity and pressure loss per 100 ft / metre for common pipe materials.

Key features

• Sizes pipes by velocity method or equal-friction (pressure-drop) method
• Chilled water, hot water and condenser-water systems
• Copper, steel and plastic pipe schedules
• Instant velocity and friction-loss readout for every size
• Metric (kPa/m, L/s, mm) and Imperial (ft.wg/100ft, GPM, in) units
• Tiny footprint, works offline, no licence key needed

Prefer to size pipes in your browser with no install? Use our free pump head calculator and hot water pipe sizing calculator.

System Requirements

• OS: Windows 7 / 8 / 10 / 11 (32 & 64-bit)
• RAM: 512 MB or more
• Disk: ~10 MB free space
• Other: No internet connection required to run

How to Install McQuay Pipe Sizer

1. Click the Download button and save the ZIP/installer to your PC.
2. Right-click the downloaded file and choose Extract All (if zipped).
3. Run Setup.exe and follow the prompts, or run the extracted PipeSizer.exe directly (portable).
4. If Windows SmartScreen appears, click More info → Run anyway (the tool is unsigned freeware).
5. Launch the app, pick your units and pipe material, and start sizing pipes.

Always scan any downloaded installer with your antivirus. MEPMate links to freeware for convenience and is not affiliated with McQuay/Daikin.