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Core closed-conduit fluid mechanics: how much water a pipe holds, how fast it moves, and how much pressure it loses to friction…
Code-based sizing of water service and distribution piping from fixture demand, static pressure and pressure losses. Follows the…
Gravity drainage sizing: fixture unit loads, slope and invert elevations, partially full pipe capacity by Manning's equation, and…
Sizing roof drains, gutters, downspouts, storm leaders and sump pumps from rainfall intensity and drainage area. Uses the…
Everything needed to select and troubleshoot a water pump: total dynamic head, hydraulic and brake horsepower, cavitation margin…
Sizing storage and tankless water heaters, computing recovery rate and temperature rise, mixing valve settings and thermal…
Sizing natural gas and LP piping and computing appliance demand, following the NFPA 54 / IFGC longest-length method and the…
Fabrication and mechanical math for the pipe itself: weight, thermal movement, offset geometry and pressure rating. Uses Barlow's…
Volume, dosing and application-rate math for water storage tanks, swimming pools and sprinkler systems. Covers partial-fill tank…
Most used in plumbing, piping & hydraulics
- Pipe Volume CalculatorRight-circular-cylinder volume; 231 in³ per US gallonEnter the inside diameter and length of a pipe run and this calculator returns how much liquid it holds — in US gallons…
- Pipe Water Velocity CalculatorCopper Development Association velocity guidanceGive this calculator a flow rate and an inside diameter and it returns the mean water velocity in feet per second and metres…
- Hazen-Williams Flow & Head Loss CalculatorHazen-Williams as tabulated in NFPA 13This calculator solves the Hazen-Williams equation in all three directions: give it a flow and get the friction loss, give it…
- Darcy-Weisbach Pressure Loss CalculatorDarcy-Weisbach with Colebrook-White friction factorEnter a flow rate, a pipe size and a fluid, and this calculator returns the friction head loss and pressure drop across the run…
- Water Supply Fixture Unit (WSFU) CalculatorIPC Appendix E (Hunter's fixture-unit method)Count your fixtures, and this calculator returns the cold, hot and combined water supply fixture unit totals, then converts the…
- Water Service & Distribution Pipe Size CalculatorIPC Appendix E friction-loss segment methodThis calculator sizes a water service or distribution main the way a plan reviewer checks it: build a pressure budget, spend…
- PSI to Feet of Head ConverterHydrostatic pressure, p = ρghPressure and head are the same physical quantity wearing different clothes, and every pump curve, well calculation and…
- Drainage Fixture Unit (DFU) CalculatorIPC Chapter 7 drainage sizing tablesCount the fixtures on the segment you are sizing and this calculator totals their drainage fixture units, then returns the…
- Pipe Slope & Fall CalculatorIPC 2021 Table 704.1Give this calculator a run length and any one expression of grade — inches per foot, percent, a 1-in-X ratio, or the total fall…
- Manning's Equation Pipe Flow CalculatorManning's equation (US customary form)Enter a pipe diameter, a slope, a Manning roughness and a depth of flow, and this calculator returns the gravity discharge in…
- Septic Tank Size CalculatorEPA Onsite Wastewater Treatment Systems Manual (EPA/625/R-00/008)This calculator sizes a residential septic tank the way a health department does: estimate the design daily wastewater flow…
- Sump Pump Size & Capacity CalculatorHazen-Williams (C = 150, PVC); Crane TP-410 equivalent lengthsMeasure how fast water rises in your sump pit with the pump unplugged, and this calculator turns that into the pump duty you…