Quickly estimate flow rate (GPM), pressure (PSI), total dynamic head, and pump size for wells, irrigation systems, boosters, and water transfer applications.
Flow, pressure, pipe size, and application type.
Total head, GPM, and estimated horsepower.
Browse pumps based on your calculated results.
Used by contractors and installers as a quick sizing reference before selecting a pump.
Choose the application and enter system details for a better starting estimate.
Optional: send your pump sizing result to Pump Supermarket so someone can review it.
Quick sizing only. Final pump selection depends on pump curve, pipe layout, water source, installation conditions, and electrical requirements.
This water pump sizing tool helps estimate the required flow rate (GPM), pressure (PSI), total dynamic head (TDH), and approximate horsepower needed for your system. It is designed as a quick pump selection guide for common applications including well pumps, irrigation systems, booster pumps, and water transfer setups.
By entering basic system details such as pipe length, elevation, number of fittings, and required pressure, you can calculate pump requirements and identify a suitable starting point before selecting a pump. This tool is useful for homeowners, contractors, installers, and maintenance professionals looking to size a pump quickly and efficiently.
Proper pump sizing depends on calculating total dynamic head (TDH), which includes vertical lift, pressure requirements, and friction losses in the piping system. Flow rate (GPM) must match the system demand, whether for irrigation zones, household water supply, or transfer applications.
For well systems, pump sizing is based on static water level, drawdown, and desired pressure at the outlet. For irrigation systems, the calculation depends on the number of sprinkler heads, flow per head, and how many zones operate at the same time. This tool simplifies those calculations to give a quick estimate before selecting a pump.
Once you determine your required flow rate and total head, you can choose from a wide range of pumps including submersible well pumps, booster pumps, centrifugal pumps, irrigation pumps, and transfer pumps. Always compare your results with manufacturer pump curves to ensure the pump can deliver the required performance.
Use the results from this tool as a starting point to filter available pumps by horsepower, voltage, and application type. Selecting the correct pump improves efficiency, performance, and long-term reliability.
Use these answers as a quick guide before selecting a pump. Final pump selection should always be checked against the pump curve and system requirements.
The correct pump size depends on the required flow rate, measured in GPM, and the total dynamic head, measured in feet. A pump should be selected to deliver the required GPM at the required head. This tool helps estimate those numbers for wells, irrigation systems, booster pumps, transfer pumps, and drainage applications.
Pump head includes pressure requirement, vertical lift, elevation rise, friction loss from pipe length, and losses from elbows or fittings. A common conversion is 1 PSI = approximately 2.31 feet of head. For example, 45 PSI equals about 104 feet of head before adding elevation and friction loss.
Total dynamic head, also called TDH, is the total resistance the pump must overcome. It includes pressure head, vertical lift, elevation, pipe friction, fittings, valves, and system losses. Pump curves are normally read using GPM and TDH.
GPM means gallons per minute. It is the flow rate required by the system. A sprinkler system may need 18 GPM, a house booster system may need 10 to 30 GPM, and larger buildings may require much more depending on the number of units, bathrooms, floors, and fixtures.
For irrigation systems, size the pump based on the largest zone running at one time. Multiply the number of sprinkler heads in the largest zone by the GPM per head. Then add the required sprinkler pressure, distance to the furthest zone, elevation rise, pipe size, and fittings.
A well pump is sized using required GPM, desired pressure, static water level, drawdown, pipe length, well casing diameter, and elevation. The pump does not only need to match the well depth; it must deliver the required GPM at the calculated total dynamic head.
Static water level is the depth from ground level to the water level inside the well when the pump is not running. This is important because it helps calculate how far the pump must lift water before pressure and friction losses are added.
Drawdown is how much the water level drops while the pump is running. For example, if static water level is 50 feet and pumping water level drops to 70 feet, the drawdown is 20 feet. Static water level plus drawdown gives a better estimate of pumping lift.
A booster pump for a house is usually sized by estimating the required flow based on bedrooms, bathrooms, square footage, number of floors, and desired pressure. If city water already has incoming pressure, that pressure is subtracted from the required pressure to calculate the boost needed.
For a building, pump sizing depends on the number of floors, number of units per floor, average bathrooms per unit, incoming water pressure, pipe size, and elevation. Taller buildings usually require more pressure because each floor adds elevation head.
Many residential systems are designed around 40 to 60 PSI, depending on the application and local plumbing requirements. Booster pumps are commonly used when city water pressure or well system pressure is not enough for the house or building.
Horsepower depends on flow rate, total dynamic head, and pump efficiency. Higher GPM and higher head usually require more horsepower. The estimated horsepower from this tool should be used as a starting point and confirmed with the manufacturer pump curve.
Pipe size affects water velocity and friction loss. Smaller pipe can create higher friction loss, which increases total dynamic head and may require a larger pump. Choosing the right pipe size improves efficiency and helps the pump operate closer to its best performance range.
A pressure tank with a pressure switch is a common and simple setup for many well and booster systems. A constant pressure or variable speed system can provide smoother pressure and better comfort, especially for homes or buildings with changing water demand.
This tool gives a quick sizing estimate and helps you find a starting point. Final pump selection should confirm the pump curve, liquid type, voltage, phase, pipe layout, suction conditions, control method, installation conditions, and local code requirements.
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