HVAC & Thermal Calculators
Estimate heating and cooling loads, airflow, duct sizing, BTU requirements, coefficient of performance and heat transfer. These tools can support learning and preliminary HVAC planning when you provide suitable dimensions and operating assumptions. Final equipment selection and system design should account for building conditions, manufacturer data, ventilation standards and qualified engineering review.
Cooling & Heating
7 tools❄️BTU CalculatorEstimate room cooling capacity.→🧊Cooling Load CalculatorEstimate sensible plus latent cooling load.→🔥Heating Load CalculatorEstimate heating requirement.→🏠Room Cooling CalculatorEstimate room cooling requirement.→⚙️HVAC Tonnage CalculatorConvert BTU/h to refrigeration tons.→📉Heat Loss CalculatorCalculate heat loss through a component.→📈Heat Gain CalculatorCalculate heat gain through a component.→
Airflow & Ducts
7 tools💨Airflow CFM CalculatorConvert airflow to CFM.→🔄Air Changes per Hour CalculatorCalculate ACH.→⭕Duct Size CalculatorSize a circular duct from flow and velocity.→➡️Duct Velocity CalculatorCalculate duct air velocity.→📉Duct Pressure Drop CalculatorEstimate straight-duct friction loss.→▣Equivalent Duct Diameter CalculatorFind equivalent circular diameter for rectangular duct.→🌬️Ventilation Rate CalculatorCalculate required ventilation airflow.→
HVAC Performance
6 tools📊COP CalculatorCalculate coefficient of performance.→⚡EER CalculatorCalculate EER.→📅SEER CalculatorCalculate a simplified seasonal efficiency ratio.→📈HVAC Efficiency CalculatorCalculate thermal efficiency.→🌡️Sensible Heat Ratio CalculatorCalculate sensible heat ratio.→🌡️Temperature Difference CalculatorCalculate temperature difference.→
Heat Transfer & Thermal
5 tools🔥Heat Transfer CalculatorCalculate conductive heat transfer.→🧱Thermal Conductivity CalculatorCalculate thermal conductivity.→🛡️Thermal Resistance CalculatorCalculate thermal resistance.→♨️Heat Exchanger CalculatorEstimate heat exchanger duty.→💧Cooling Water Flow Rate CalculatorCalculate cooling-water flow.→
About these tools
These calculators use standard engineering relationships and clearly state simplified assumptions where applicable. For real HVAC design, verify results against local codes, manufacturer data and detailed load calculations.
These calculators use standard engineering relationships and clearly state simplified assumptions where applicable. For real HVAC design, verify results against local codes, manufacturer data and detailed load calculations.