10 calculators

HVAC Calculators

HVAC calculators for BTU sizing, duct design, refrigerant charge, heat load, and airflow calculations. Based on ASHRAE standards.

BTU Calculator

Calculate heating and cooling BTU requirements based on room size, insulation, climate zone, and occupancy.

Calculate required duct dimensions based on CFM airflow requirements and maximum velocity.

Estimate refrigerant charge based on system capacity, line set length, and refrigerant type.

Calculate building heat load using a simplified Manual J method for residential HVAC sizing.

Calculate cubic feet per minute (CFM) airflow based on room volume and required air changes per hour.

Calculate the number of air changes per hour (ACH) based on room volume and airflow rate.

Calculate cooling capacity in tons of refrigeration based on BTU load and system efficiency.

Calculate static pressure loss in ductwork based on duct dimensions, airflow, and fitting count.

Calculate humidification requirements based on space volume, desired humidity, and outdoor conditions.

Calculate EER and SEER ratings for HVAC equipment to compare energy efficiency.