HVAC
BTU, duct size, and HVAC calculators.
17 toolsBoiler Output Calculator
Calculate boiler output from boiler horsepower. Free, instant.
calculatorBTU Calculator
Calculate BTU needed to heat or cool a room. Free, instant.
calculatorBTU by Room Size
Estimate BTU needed for a room.
calculatorCFM Per Room Calculator
Calculate required CFM for a room based on air changes per hour. Free, instant.
calculatorRound Duct Size Calculator
Calculate round duct diameter from CFM and velocity. Free, instant.
calculatorDuct Air Velocity Calculator
Calculate air velocity from CFM and duct size. Free, instant.
calculatorDuct Air Velocity
Calculate air velocity in a duct.
calculatorEER to SEER Converter
Convert between EER and SEER ratings. Free, instant.
calculatorHeat Loss Calculator
Calculate heat loss through a wall or window. Q = U × A × ΔT. Free, instant.
calculatorHeat Pump COP Calculator
Heat Pump COP Calculator. Free, instant, no signup.
calculatorHeating Load Calculator
Heating Load Calculator. Free, instant calculator.
calculatorHumidifier Sizing Calculator
Calculate humidifier capacity needed. Free, instant.
calculatorHVAC CFM Calculator
HVAC CFM Calculator. Free, instant calculator.
calculatorHumidity Ratio Calculator
Humidity Ratio Calculator. Free, instant, no signup.
calculatorRefrigerant Charge Calculator
Estimate additional refrigerant charge for extended line sets. Free, instant.
calculatorAC Tonnage Calculator
Calculate AC tonnage from square footage. Free, instant.
calculatorVentilation Rate Calculator (ASHRAE)
Ventilation Rate Calculator (ASHRAE). Free, instant, no signup.
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