Professional conversion hub
HVAC Converters
Convert the units commonly found on HVAC drawings, fan curves, air-handling equipment, ductwork, refrigeration specifications, and ventilation schedules. Use these tools for unit conversion, then verify final design values against the applicable project standard and manufacturer data.
Featured HVAC Converters
Browse all categories →Airflow and ventilation
Move between CFM, cubic metres per hour, litres per second, GPM, and other flow-rate units used for fans, extract systems, ducts, and air handling equipment.
Static pressure and gauges
Convert pressure units used for filters, ducts, fans, compressors, pumps, and equipment data sheets, including inches of water, pascals, kPa, bar, and PSI.
Cooling capacity and power
Compare refrigeration tons, kilowatts, watts, horsepower, and BTU per hour when reading equipment capacity and power ratings.
Temperature
Switch between Celsius, Fahrenheit, Kelvin, and Rankine for setpoints, ambient conditions, refrigeration work, and technical documentation.
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Accuracy for Professional Work
These tools convert units using the factors and formulas stored in UnitConverterHQ. A correct unit conversion does not replace engineering design, commissioning, equipment selection, applicable codes, manufacturer data, or professional judgment. Keep the original measurement precision and verify safety-critical work against the governing standard.
Frequently Asked Questions
View sitemap →Which airflow units are common in HVAC?
CFM is common in US equipment and ductwork, while cubic metres per hour and litres per second are widely used in metric specifications. The correct unit depends on the project and equipment documentation.
Is converting airflow the same as sizing a duct or fan?
No. Unit conversion only changes the way a value is expressed. Duct and fan sizing also depends on velocity, pressure loss, system resistance, noise, temperature, altitude, and other design conditions.
What does inH2O mean?
inH2O means inches of water column, a pressure unit commonly used for small pressure differences in ventilation and HVAC work.