Plan hvac projects faster
Use these hvac calculators to estimate measurements, quantities, materials, sizes, costs, and unit conversions before comparing project drawings, supplier data, or product labels.
Calculator hub
HVAC Calculators 15 tools
HVAC calculators for sizing BTU, CFM, ducts, furnace, heat pump, AC tonnage, airflow, static pressure and refrigerant charge
Tools
HVAC Calculators tools
Btu Calculator
Cfm Calculator
Hvac Load Calculation
Manual J Load Calculation
Ac Btu Calculator
Furnace Size Calculator
Duct Size Calculator
Mini Split Size Calculator
Ac Tonnage Calculator
Duct Cfm Calculator
Air Changes per Hour Calculator
Static Pressure Calculator
Heat Pump Size Calculator
Bathroom Fan Cfm Calculator
Refrigerant Charge Calculator
Measure first, then verify
Enter the clearest measurements you have, add waste or safety margin when the calculator supports it, and verify final decisions with manufacturer instructions, local code, and qualified professionals when required.
HVAC Calculators FAQ
How does this free hvac calculators work?
This calculator converts the key hvac calculator measurements into practical result cards using the formula shown on the page, with optional waste and cost inputs when relevant.
How does this hvac sizing calculator work?
This calculator converts the key hvac calculator measurements into practical result cards using the formula shown on the page, with optional waste and cost inputs when relevant.
How does this duct and airflow calculator work?
This calculator converts the key hvac calculator measurements into practical result cards using the formula shown on the page, with optional waste and cost inputs when relevant.
How does this btu and cfm calculator work?
This calculator converts the key hvac calculator measurements into practical result cards using the formula shown on the page, with optional waste and cost inputs when relevant.
What measurements do I need for the HVAC Calculator?
Enter the dimensions, quantity, unit system, and any waste or package settings that apply to your hvac calculator. The result is only as reliable as the measurements you enter.
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