HVAC Calculators
Calculate fan laws, duct static pressure, BTU recovery, and gas piping capacities for mechanical systems.
Air Changes
Launch the Air Changes tool to calculate accurate results.
Boiler Surface Blowdown Rate
Launch the Boiler Surface Blowdown Rate tool to calculate accurate results.
Boiler Make-Up Water & Valve Sizing
Calculate the required GPM auto-fill rate and PRV valve sizing for hydronic heating systems based on boiler BTUH rating and loop pressure. Includes cold-fill PSI guidance, expansion tank relationship, and valve selection by flow capacity.
Centrifugal Fan Brake Horsepower (BHP) Calculator
Calculate the raw aerodynamic horsepower required at the fan shaft to overcome duct static pressure before factoring in electrical drive losses.
Chiller Efficiency Converter (COP / EER / kW-ton)
Bi-directional standardized thermodynamic conversion for industrial chiller efficiency indexes, decoding exactly how much electrical grid load is drawn per physical refrigeration ton.
Commercial Chiller Iplv
Launch the Commercial Chiller Iplv tool to calculate accurate results.
Compressor Volumetric Efficiency Engine
Calculate the true volumetric pumping efficiency of a reciprocating HVAC/R compressor based on clearance volume and compression ratios to diagnose severe systemic failures.
Cooling Coil Condensate Engine
Exactly calculate the gallons per hour of destructive condensate water stripped from the airstream across a cooling coil based on psychrometric humidity drops and mass airflow tracking.
Cooling Tower Approach & Range Efficiency
Analyze the thermodynamic evaporative efficiency, Range, and Approach temperature of a commercial cooling tower based on entering condenser water, leaving cold water, and ambient wet-bulb limits.
Tower Evaporation & Blowdown Engine
Analyze commercial cooling tower hydrology, calculating pure evaporation rates, critical chemical blowdown drains, and total municipal makeup water consumption required to prevent catastrophic scaling.
Cooling Tower Makeup & Blowdown Engine
Calculate commercial cooling tower evaporation rates, chemical blowdown requirements, and total makeup water demand using the 0.03 GPM/Ton approximation rule for chiller plant sizing.
Hydraulic Pipe Friction (Darcy-Weisbach)
Execute rigorous Darcy-Weisbach head loss equations to determine exact dynamic pipe friction vectors across complex commercial hydronic networks and chilled water loops.
Dew Point & Condensation Analyzer
Mathematically calculate the exact threshold where atmospheric humidity turns into liquid water using the Magnus-Tetens risk equation to prevent structural rot.
HVAC Duct Equivalent Length Calculator
Mathematically calculate aerodynamic friction and structural turbulence loss across sheet metal HVAC elbows translating them into straight-pipe equivalent lengths.
HVAC Duct TEL & Static Friction Loss Calculator
Calculate Total Equivalent Length (TEL) and resulting external static pressure drops by mathematically compounding the aerodynamic drag of straight pipe with high-friction HVAC elbows and terminal boots.
HVAC Available Friction Rate Estimator (Manual D)
Determine the target Friction Rate (FR) for sheet metal sizing by calculating Total External Static Pressure (TESP) deductions against the Critical Path Equivalent Length.
HVAC Duct Transition & Reducer Fabrication Calculator
Mathematically determine the minimum SMACNA-compliant fabrication length required for sheet metal duct transitions to prevent high-velocity aerodynamic stall and turbulence.
Duct Weight
Launch the Duct Weight tool to calculate accurate results.
HVAC True Cooling Load: Total Defrost & Enthalpy
Exactly calculate the total thermodynamic heat removal (BTU/hr) and system Tonnage based on the combined sensible (temperature) and latent (moisture) energy state of the air.
Evaporative Cooler Sizing
Launch the Evaporative Cooler Sizing tool to calculate accurate results.
Hydronic Expansion Tank Volume Sizing
Exactly calculate the required acceptance volume for a closed-loop hydronic expansion tank to prevent blown pressure relief valves and catastrophic boiler failures.
HVAC Fan Laws Calculator (Affinity Laws)
Exactly calculate the aerodynamic consequences of altering blower RPM. Predict the new exponential required Brake Horsepower, CFM, and duct Static Pressure before switching pulleys.
Gas Pipe Pressure Drop Sizing (Pole's Formula)
Verify IFGC friction boundaries for low-pressure black iron natural gas and propane distribution lines. Prevent flame roll-outs and burner starvation.
Geothermal Ground Loop Sizing Calculator
Determine exact excavation bore depths and required total HDPE pipe lengths needed to successfully sink heat pump refrigerants into stable earth loops without thermal saturation.
Room CFM & Duct Sizing Estimator
Estimate required HVAC airflow (CFM) based on room volume and Air Changes per Hour (ACH), and map it to a strictly sized residential round duct.
Hydronic Baseboard Radiation Sizing Calculator
Size standard fin-tube baseboard radiation for residential boiler systems. Calculate the required linear footage mathematically based on room BTU heat loss, target water temperature, and pump GPM flow rate.
Hydronic Buffer Tank Sizing Calculator
Mathematically calculate the exact thermal storage volume (gallons) required to prevent dangerous boiler short-cycling using the ASHRAE specific heat formula.
Commercial Kitchen Hood CFM Calculator
Mathematically calculate IMC-compliant minimum exhaust CFM for commercial kitchen hoods based on duty classification, architectural hood style, and physical hood dimensions.
HVAC Line Set Trim Charge Calculator
Mathematically calculate the exact ounces of additional R-410A required for long refrigerant line sets exceeding factory allowances. Essential for preventing compressor flood-back and maintaining target subcooling.
Log Mean Temperature Difference (LMTD) Calculator
Mathematically calculate the exact Logarithmic Mean Temperature Difference (LMTD) driving force for counter-flow and parallel-flow shell-and-tube or plate heat exchangers.
Make-Up Air (MUA) Heating Load Calculator
Mathematically calculate the extreme sensible heating capacity (BTU/hr) required to temper frigid winter Make-Up Air for commercial kitchen exhaust hoods.
Mini-Split BTU Load Estimator
Mathematically estimate the required cooling minimums (BTUs and Tonnage) for ductless mini-split HVAC zones based on footprint, solar gain, and metabolic loads.
Mixed Air Temp
Launch the Mixed Air Temp tool to calculate accurate results.
Mixed Air Temperature (MAT) Calculator
Mathematically resolve psychological air mass enthalpy by calculating the exact Mixed Air Temperature (MAT) created when indoor RETURN air violently blends with outdoor MAKEUP air.
Moist Air Enthalpy Calculator
Mathematically resolve the true Total Thermodynamic Energy (Enthalpy) of moist air by isolating Sensible Heat payload from Latent Heat payload. Essential for calculating Total HVAC Cooling Coil Tonnage.
Pitot Tube Traverse Calculator
Mathematically execute a 16-point Pitot Tube Traverse matrix by correctly averaging the square roots of Velocity Pressures (VP) to isolate True Average FPM and Absolute Duct CFM.
Psychrometric State Point Calculator
Mathematically execute empirical humidity ratios and relative vapor pressure percentages purely from physical Dry Bulb and Wet Bulb sling psychrometer thermodynamic state points.
HVAC Blower Pulley Speed & Sizing Calculator
Dynamically resolve precise motor pulley drive ratios, belt RPMs, and driven blower sheave sizing to target required HVAC airflow without overamping equipment.
Pump Affirmity Laws Calculator
Mathematically project Variable Frequency Drive (VFD) energy savings by isolating the cubic brake horsepower reduction parameters governed by centrifugal Pump Affinity Laws.
Pump Affinity
Launch the Pump Affinity tool to calculate accurate results.
Refrigerant Line Set Charge Adder Calculator
Calculate exactly how many ounces of additional refrigerant must be weighed into a split-system air conditioner or heat pump when the physical copper line set exceeds the factory pre-charge baseline distance.
Smacna Duct Leakage
Launch the Smacna Duct Leakage tool to calculate accurate results.
Steam Pipe Warm Up Condensate Load
Launch the Steam Pipe Warm Up Condensate Load tool to calculate accurate results.
Superheat Subcooling Diagnostic
Launch the Superheat Subcooling Diagnostic tool to calculate accurate results.
Ventilation Ach Louver
Launch the Ventilation Ach Louver tool to calculate accurate results.