Tables and calculators

A little helping hand from us

Our tables below are all interactive and are free for you to use.

For those looking for equivalent diameters for rectangular and round circular ducts, just click on our useful download here: Equivalent Diameters for Rectangular and Round Circular Ducts

Air Mix Calculator
Enter Outside Airflow:
Enter Indoor Airflow: Total Airflow
Enter Outside Temp: Enter Indoor Temp:  Mixed Temp
Common Conversions
Common Conversions
Enter J/S/KG: Equals: BTU/h/lb

Enter SQ FEET:
Equals: SQ Meters
Enter SQ Meters: Equals: SQ Feet
Enter MM: Equals: FEET
Enter SQ Inches: Equals: SQ Feet
Enter SQ FEET: Equals: SQ Inches
Enter FEET: Equals: MM
Enter PSI: Equals: Ft of H20
Enter PSI: Equals: HG
Enter GPM(US): Equals: Litres per second
Enter BTUH: Equals: Watts
Enter WATTS: Equals: BTUH
Enter DEG C: Equals: DEG F
Enter DEG F: Equals: DEG C
BTUH calculator
Enter EAT: Enter EWT:
Enter LAT: Enter LWT:
Enter CFM: Enter GPM:
Motor Sizing Calculator
Motor Sizing Calculator
Enter OZ, FT Needed:
Motor RPM:
Enter % Drive Loss:
BHP Needed: