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Pipe Flow & Hydraulics
Core closed-conduit fluid mechanics: how much water a pipe holds, how fast it moves, and how much pressure it loses to friction…
Water Supply & Distribution Sizing
Code-based sizing of water service and distribution piping from fixture demand, static pressure and pressure losses. Follows the…
Drainage, Waste, Vent & Septic
Gravity drainage sizing: fixture unit loads, slope and invert elevations, partially full pipe capacity by Manning's equation, and…
Water Heaters & Hot Water Demand
Sizing storage and tankless water heaters, computing recovery rate and temperature rise, mixing valve settings and thermal…
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…