HVAC & Plumbing Calculators — Construction
Airside and load sizing for HVAC: air changes per hour, CFM, air flow rate, cooling load, and air-conditioner BTU capacity. Size the cooling load before the equipment, since BTU rules of thumb based on floor area alone routinely oversize a system.
All HVAC & Plumbing Calculators
Calculate air change rate with inputs, formulas, and instant results.
Calculate air changesper hour with inputs, formulas, and instant results.
Calculate air conditioner btucalculator with inputs, formulas, and instant results.
Calculate air flow rate with inputs, formulas, and instant results.
Calculate cfmcalculator with inputs, formulas, and instant results.
Calculate cooling load with inputs, formulas, and instant results.
Calculate duct area with inputs, formulas, and instant results.
Calculate duct friction loss with inputs, formulas, and instant results.
Calculate energy consumption with inputs, formulas, and instant results.
Calculate equivalent length fittings with inputs, formulas, and instant results.
Calculate expansion tank size with inputs, formulas, and instant results.
Calculate fire flow with inputs, formulas, and instant results.
Calculate heating load with inputs, formulas, and instant results.
Calculate hydronic flow balancing with inputs, formulas, and instant results.
Calculate latent heat load with inputs, formulas, and instant results.
Calculate pipe friction loss with inputs, formulas, and instant results.
Calculate pipe heat loss with inputs, formulas, and instant results.
Calculate pipe sizing with inputs, formulas, and instant results.
Calculate psychrometric dew point with inputs, formulas, and instant results.
Calculate psychrometric humidity ratio with inputs, formulas, and instant results.
Calculate pump head loss with inputs, formulas, and instant results.
Calculate sensible heat load with inputs, formulas, and instant results.
Calculate ventilation rate with inputs, formulas, and instant results.
Calculate water flow rate with inputs, formulas, and instant results.
Convert oven time and temperature to air fryer settings, and scale cook times by basket load and food thickness.
Calculate onboarding friction to identify adoption barriers
Calculate net loss from returns including shipping, labor, and salvage
Calculate heating and cooling requirements
About HVAC & Plumbing Calculators
Airside and load sizing for HVAC: air changes per hour, CFM, air flow rate, cooling load, and air-conditioner BTU capacity. Size the cooling load before the equipment, since BTU rules of thumb based on floor area alone routinely oversize a system.
Whether you need to solve a one-time problem or verify your own calculations, these free tools cover the most common hvac & plumbing scenarios. All results are computed in your browser — no data is sent to any server.
What You Can Calculate
This section includes 28 tools: Air Change Rate Calculator, Air Changesper Hour Calculator, Air Conditioner BTU Calculator, Air Flow Rate Calculator, CFM Calculator, Cooling Load Calculator, Duct Area Calculator, Duct Friction Loss Calculator, and 20 more. Each calculator is free to use with no signup required.