HVAC FORMULATOR - Your Complete Professional HVAC Engineering Companion

Built for HVAC engineers, technicians, contractors, and students, HVAC Formulator delivers powerful calculations and comprehensive reference materials in one intuitive app. Whether you are sizing ductwork, calculating cooling loads, applying fan laws, or referencing the California Energy Code, this app has you covered.

265+ Professional Calculators across 23 Categories:

• Air Change Rate: Air changes per hour, airflow rate, CFM per air change, and outdoor heat percentage
• Airside: Sensible heat, latent heat, total heat with US and metric support
• Boiler: Efficiency, BTU output, economizer calculations, fire tube, and safety valve formulas
• Cooling Load: Heat transfer through walls/roof, CLTD method, solar heat gain, people/lighting/equipment loads
• Duct Sizing: CFM from velocity, equivalent round duct, rectangular duct area, and duct heat gain/loss
• Ductwork: Area of round duct, velocity, velocity pressure, and total pressure
• Electrical: Ohm's law, single and three-phase power, kW to amps, motor efficiency, and voltage imbalance
• Energy: BTU and Joule content for 16 fuel types including oil, gas, coal, and electricity
• Fan Laws: All three fan affinity laws plus fan horsepower calculations
• Gas Laws: Boyle's law, Charles's law, combined gas law, ideal gas law, and air density
• Heating Design: Electric heating, baseboard, heat tracing, hydronic snow melting, and boiler sizing
• Heating Requirement: Quick estimates for average and good insulation
• Humidity: Specific humidity, relative humidity, sensible and latent heat
• Hydronic Formulas: GPM heat transfer, flow coefficient Cv, system head loss, and expansion tank sizing
• Loads: Heat from lighting, equipment, machines, expansion tanks, and mixture pressure
• Piping: 70 formulas covering pipe area, weight, expansion, friction loss, offsets, and drainage
• Psychrometrics: Dew point, enthalpy, total heat from enthalpy, grains of moisture, and sensible heat ratio
• Pump Laws: Brake horsepower, suction head, outlet flow, input power, efficiency, and displacement
• Refrigeration: Chiller and air unit tonnage, coefficient of performance, compression ratio, and cooler loads
• Steam: Pounds per hour, condensate loads, transmission line sizing, and enthalpy change
• Temperature: Mixed air and liquid mixing calculations
• Ventilation Rate: ASHRAE 62.1 ventilation rate procedure and CO2-based demand ventilation
• Waterside System: Total heat, evaporator and condenser water flow rates

Extensive Conversion Library:

• 16 conversion categories including Pressures, Flows, BTU, Linear, Square, Cubic, Weights, Power, Watts, Horsepower, and more
• HVAC-specific conversions for ductwork airflow, heating capacity, and refrigeration
• 8 temperature scales: Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Newton, Delisle, and Rømer
• Complete metric conversion suite with hundreds of unit conversions

Comprehensive Reference Library:

• HVAC Design Manual - 9 chapters covering design parameters, airside systems, cooling/heating, controls, and climatic data
• California Energy Code 2025 - Single Family, Multifamily, and Non-Residential building codes
• 18 Reference Drawings - Chimney clearances, duct thickness, piping support, refrigerant classification, and more

Professional Features:

• Save and compare calculation results
• Share calculations with colleagues and clients
• Favorite frequently used calculators
• US and Metric unit support
• Dark mode interface
• Works offline - no internet required

HVAC Formulator is FREE to download with access to calculators and reference materials. Upgrade to Pro to unlock saved calculations, additional content, and premium features.