Free online hvac calculators for construction professionals, contractors, and DIY enthusiasts.
Most used tools
Calculate BTU requirements for cooling or heating a room.
Convert total BTU load into HVAC tonnage for system sizing.
Calculate airflow in CFM from duct diameter and velocity.
Calculate building heat loss through walls, roof, and windows.
Calculate fresh air ventilation requirements by standard.
Recently popular tools
18 tools available
Calculate BTU requirements for cooling or heating a room.
Convert total BTU load into HVAC tonnage for system sizing.
Calculate airflow in CFM from duct diameter and velocity.
Determine duct size from CFM, type, and velocity.
Calculate building heat loss through walls, roof, and windows.
Calculate solar heat gain through windows.
Calculate required airflow for target air changes per hour.
Calculate refrigerant charge based on system parameters.
Estimate energy savings from thermostat temperature adjustments.
Calculate relative humidity from temperature and dew point.
Calculate fresh air ventilation requirements by standard.
Determine required pipe insulation thickness for temperature control.
Determine how many air diffusers are needed for a room.
Calculate static pressure from duct dimensions and airflow.
Calculate SEER rating from cooling capacity and power input.
Size a heat pump based on heating/cooling loads and COP.
Determine how many radiator panels are needed for a room.
Calculate duct pressure drop from friction and roughness.
More construction tools available
Our hvac calculators provide accurate, instant results for construction professionals, contractors, and DIY enthusiasts. Each calculator uses industry-standard formulas and handles edge cases to deliver reliable estimates.
Whether you need to estimate materials, calculate costs, or plan your next project, our hvac tools deliver reliable results to help you make informed decisions and stay on budget.
