Plumbing
Precision plumbing and hydraulic calculation tools for water tank sizing, pipe flow velocity, water consumption, pump pressure, drainage slopes, septic tanks, and utility costs.
Free online general tools.
Drain Pipe Size Calculator
Determine the minimum drain pipe size required based on total connected Drainage Fixture Units (DFU) using standard plumbing code capacity tables.
Drainage Pipe Calculator
Calculate total drainage pipe needed for a run including waste/fittings allowance, and get a recommended pipe diameter from a standard DWV fixture-unit sizing table.
Drainage Slope Calculator
Calculate gravity drain pipe fall, pitch, and slope drop percentage to meet building plumbing code standards (1/4" per foot or 1:50).
Hot Water Demand Calculator
Estimate daily hot water demand and peak hour demand for a household based on occupants and typical usage patterns.
Pipe Diameter Calculator
Determine the minimum pipe diameter required to carry a desired flow rate at a target design velocity.
Pipe Flow Calculator
Calculate water flow rate, discharge velocity, and cross-sectional area through internal pipe diameters using fluid velocity dynamics.
Pipe Length Calculator
Calculate true pipe cut lengths accounting for fitting engagement depth, 45-degree offset travel lengths, and center-to-face allowances.
Pipe Volume Calculator
Calculate the internal volume of water or fluid held inside a pipe based on inside diameter and length, in gallons and liters.
Pipe Weight Calculator
Estimate the weight of a pipe section based on outside diameter, inside diameter, length, and material density (steel, PVC, copper, or cast iron).
Plumbing Material Calculator
Estimate required pipe lengths, fittings (elbows, tees, couplings, valves), pipe cement/sealant, and hangers for plumbing installations.
Pump Flow Calculator
Calculate pump flow rate in GPM using the continuity equation (Q = A × V) based on pipe inside diameter and flow velocity.
Pump Head Calculator
Calculate total dynamic head (TDH) for a pump by combining static lift, friction loss, and required discharge pressure.
Pump Power Calculator
Calculate hydraulic and brake horsepower required for a pump based on flow rate, total head, fluid specific gravity, and pump efficiency.
Pump Size Calculator
Calculate required water pump power (HP and Watts) based on desired flow rate (GPM/LPM), total dynamic head (TDH), and pump mechanical efficiency.
Septic Tank Size Calculator
Determine required septic tank capacity and drain field leach line length based on bedroom count, daily wastewater volume, and soil percolation.
Sewer Pipe Calculator
Calculate gravity flow capacity of a sewer pipe flowing full using Manning's equation, based on diameter, slope, and pipe roughness coefficient.
Water Bill Calculator
Calculate total monthly water utility charges, tiered consumption rates (CCF, Gallons, or m³), sewer wastewater fees, and municipal service surcharges.
Water Heater Size Calculator
Recommend an appropriately sized storage tank water heater based on the number of occupants in a household, rounded to the nearest standard tank size.
Water Heating Cost Calculator
Estimate the energy cost to heat a given volume of water from a starting temperature to a target temperature, accounting for water heater efficiency and electricity rate.
Water Pressure Calculator
Calculate static hydrostatic water pressure, head loss, and dynamic pressure drops across elevation changes and pipe runs.
Water Tank Size Calculator
Calculate domestic, commercial, or rainwater storage tank capacity in liters or gallons based on occupants, daily consumption, and reserve backup days.
Water Usage Calculator
Estimate daily, monthly, and annual household water consumption across showers, toilets, laundry, dishwashing, and outdoor irrigation.