HVAC Formulator

HVAC FORMULATOR is the essential tool for Heating, Ventilating, and Air Conditioning professionals. With over 900 formulas and calculations, it covers everything from basic load calculations to advanced system design — all in your pocket.

US & METRIC SUPPORT — Switch instantly between US (Imperial) and Metric (SI) units. Results display in both systems so you always have the value you need. Input labels and conversions update automatically.

23 CALCULATOR CATEGORIES including:

• Cooling Load — Sensible, latent, and total cooling calculations, tons, EER, COP, and sensible heat ratio
• Fan Laws — Speed and diameter affinity laws for CFM, pressure, and horsepower
• Duct Sizing — Velocity, round and rectangular sizing, equivalent diameter, aspect ratio
• Ventilation Rate — ASHRAE 62.1 breathing zone, air changes per hour, exhaust fan sizing
• Electrical — Ohm's Law, single and three-phase power, motor FLA, watts to BTU/h
• Gas Laws — Boyle's, Charles's, Gay-Lussac's, Combined, and Ideal Gas Law
• Psychrometrics — Bypass factor, mixed air temperature, percent outside air, dew point
• Hydronic Formulas — Heat transfer, flow rate, pipe velocity, expansion tank, Cv coefficient
• Boiler — Efficiency calculations, BTU output, heat absorption
• Refrigeration — Tonnage output, compression ratio, mass flow rate, COP
• Ductwork — Velocity, velocity pressure, total pressure, equivalent round
• Airside — Sensible heat, latent heat, total heat (US and Metric)
• Piping — Pipe area, weight, friction loss, expansion, Hazen-Williams, 70+ formulas
• Steam — Condensate loads, fuel calculations, steam flow
• Pump Laws — Break horsepower, suction head, pump affinity laws
• Energy — Fuel values for oil, gas, coal, propane, ethanol, and more
• Heating Design — Electric heating, baseboard, radiant ceiling, boiler capacity, hydronic snow melting
• Heating Requirement — Insulation-based load calculations
• Humidity — Specific humidity, relative humidity, sensible and latent heat
• Loads — Temperature loads, heat gains from lights, equipment, and machines
• Temperature — Mixed air, liquid mixing, final temperature calculations
• Waterside System — Total heat, evaporator and condenser flow rates
• Air Change Rate — Air changes per hour, air flow rate

460+ UNIT CONVERSIONS across 16 categories: Metric, Pressures, BTU, Linear, Square, Cubic, Liquid Measures, Weights, Flows, Power, Horsepower, Watts, Hydraulic, Ft-Lbs, Sand/Volume, and HVAC-specific conversions.

8 TEMPERATURE SCALES — Convert between Celsius, Fahrenheit, Kelvin, Rankine, Reaumur, Newton, Delisle, and Romer.

BUILT FOR PROFESSIONALS:

• Search across all 900+ formulas instantly
• Mark favorites for quick access
• Save calculation history with full breakdown
• Share and export results
• Clean, fast interface designed for field use
• Works offline — no internet required

HVAC FORMULATOR is a professional-grade tool built for HVAC technicians, engineers, contractors, and students. New formulas and features are added regularly.