HVAC Unit Converter

Imperial ↔ metric conversions for the numbers that show up on duct drawings, fan curves and submittals.

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Method and assumptions

1 CFM = 1.699 m³/h = 0.4719 L/s. 1 in. w.g. = 248.84 Pa (water at 60 °F). 1 m/s = 196.85 FPM. 1 in = 25.4 mm (exact).
Pressure conversions are unit conversions only — they do not correct for air density, altitude or temperature.
Results rounded for display: whole units above 1,000, one decimal above 100, three decimals above 1, five below.

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Important Disclaimer

This calculator is for preliminary design guidance only. Final duct sizing, construction, and installation must be performed by qualified professionals and comply with applicable codes and standards.