BTU Load Calculator
Estimate room heating and cooling BTU load from area, ceiling height, insulation, and sun exposure for faster HVAC planning and equipment sizing.
Open calculatorAll Calculators
Browse all live HVAC, Plumbing, and Electrical calculators from one index page.
HVAC Calculators
13 toolsAC Tonnage Calculator
Convert conditioned area and insulation assumptions into estimated BTU demand and AC tonnage to shortlist practical cooling capacity options quickly.
Open calculatorMini Split Sizing Calculator
Estimate a mini split BTU range from room size, ceiling height, and climate so technicians and homeowners can choose practical equipment faster.
Open calculatorCFM Airflow Calculator
Calculate required airflow CFM from room dimensions and target ACH so HVAC teams can estimate ventilation and comfort airflow requirements quickly.
Open calculatorDuct Size Calculator
Estimate round duct diameter from airflow and velocity targets so installers can choose practical branch sizes during early layout and retrofit planning.
Open calculatorDuct Friction Loss Calculator
Estimate duct pressure loss from run length, fittings, diameter, and airflow so technicians can sanity-check static pressure assumptions quickly.
Open calculatorSEER Savings Calculator
Compare annual cooling energy use between existing and proposed SEER ratings to estimate operating-cost savings and support upgrade planning.
Open calculatorBaseboard Heater Size Calculator
Estimate required baseboard heater length from room conditions or known BTU load with hydronic and electric output assumptions.
Open calculatorBTU Tons kW Converter
Convert heating and cooling values between BTU/hr, tons, and kW for quick HVAC planning and equipment comparisons.
Open calculatorCFM per Ton Calculator
Estimate total system airflow from equipment tonnage and target CFM per ton for fast HVAC planning checks.
Open calculatorDuct Velocity Calculator
Calculate duct air velocity from CFM and duct dimensions for round or rectangular ducts.
Open calculatorEquivalent Length Calculator
Estimate total equivalent duct length from straight run and fitting counts for early static-pressure checks.
Open calculatorHydronic Flow GPM Calculator
Estimate hydronic flow rate (GPM) from heat load and temperature difference for water-based systems.
Open calculatorPlumbing Calculators
13 toolsWater Heater Size Calculator
Estimate recommended storage water heater gallons from occupants, bathrooms, and simultaneous hot-water demand for replacement and planning decisions.
Open calculatorPipe Size Calculator
Estimate nominal supply pipe size from fixture count, run length, and material assumptions to support quick planning before detailed code checks.
Open calculatorDrain Slope Calculator
Calculate total vertical drop for drain runs from slope per foot so plumbing crews can set elevations quickly and avoid low-slope drainage issues.
Open calculatorFixture Flow Rate Calculator
Estimate total and diversified fixture flow demand in GPM so plumbing teams can plan supply sizing and evaluate expected peak usage patterns.
Open calculatorExpansion Tank Size Calculator
Estimate domestic hot-water expansion tank size from system volume, pressure, and temperature rise to support safer plumbing system setup.
Open calculatorTankless Water Heater Size Calculator
Estimate tankless heater BTU/hr from simultaneous flow and temperature rise to shortlist practical whole-home size classes.
Open calculatorWater Pressure Drop Calculator
Estimate straight-run water pressure loss with a simplified Hazen-Williams method for planning-level pipe checks.
Open calculatorSewer Pipe Capacity Calculator
Estimate full-flow sewer capacity and velocity using Manning-based assumptions for quick drainage planning checks.
Open calculatorSump Pump Size Calculator
Estimate required sump pump flow with safety margin and suggest an initial HP class for planning checks.
Open calculatorPipe Volume Calculator
Calculate pipe internal volume in gallons, liters, and cubic feet from diameter and run length for planning and flushing estimates.
Open calculatorWell Pump Size Calculator
Estimate well pump TDH and flow target to suggest a planning-level HP class before validating with actual pump curves.
Open calculatorSeptic Tank Size Calculator
Estimate septic tank volume from bedrooms, occupants, and daily flow assumptions with reserve margin and standard-size suggestions.
Open calculatorGrease Interceptor Size Estimator
Estimate grease interceptor volume from flow and retention assumptions or fixture volume inputs for early commercial kitchen planning.
Open calculatorElectrical Calculators
8 toolsWatts Amps Volts Calculator
Calculate watts, amps, or volts by entering any two known electrical values for fast field checks and planning estimates.
Open calculatorKilowatts to Amps Calculator
Convert kilowatts to amps for single-phase and three-phase systems with voltage and power factor assumptions.
Open calculatorOhm's Law Calculator
Compute volts, amps, resistance, and watts from any two known values using standard Ohm's Law relationships.
Open calculatorVoltage Drop Calculator
Estimate voltage drop across conductor runs for early branch and feeder planning.
Open calculatorBreaker Size Calculator
Estimate breaker sizing from connected load assumptions and basic continuous-load planning factors.
Open calculatorWire Size Estimator
Estimate conductor size starting points from amperage, run length, and basic installation assumptions.
Open calculatorEnergy Cost Calculator
Estimate operating cost from wattage, runtime, and utility rate for budgeting and upgrade comparisons.
Open calculatorConduit Fill Estimator
Estimate conduit fill percentage from conduit size and conductor counts for quick layout checks.
Open calculatorAll tools are estimates; verify with local code/manufacturer guidance.