Estimate sump pump size, required pump GPM, total dynamic head, vertical lift, discharge pipe loss, basin fill rate, pump horsepower, and capacity margin for basement drainage, crawl space drainage, stormwater pumping, and sump pit planning.
Size by basin fill rate:
The calculator estimates how fast water enters the sump basin based on basin diameter, water rise, and fill time.
Size by drainage area:
The calculator estimates stormwater inflow from drainage area, rainfall rate, and runoff coefficient.
Known flow and head:
The calculator uses your known flow and estimates total dynamic head from vertical lift and discharge pipe loss.
Capacity check:
The calculator compares a known pump capacity against the estimated required flow.
A sump pump size calculator helps estimate the flow capacity and head rating needed before choosing a pump.
It can help compare basin inflow, rainfall runoff, pump GPM, total dynamic head, pipe loss, horsepower, and capacity margin.
Your result shows an estimated sump pump capacity requirement and total dynamic head. This is a planning estimate only. Final pump selection should be based on the pump curve, actual discharge layout, check valve, fittings, vertical lift, pipe size, backup needs, power supply, and local drainage conditions.
Estimate the water inflow rate, add a safety factor, then choose a pump that can deliver that flow at the required total dynamic head.
Pump head is the height and resistance the pump must overcome to move water. It includes vertical lift plus friction from pipe, fittings, valves, and discharge length.
GPM at the required head is usually more important than horsepower alone. Always check the pump curve to see actual output at your head height.
No. This calculator gives a planning estimate. Final sump pump sizing should be checked against pump curves, discharge layout, local drainage conditions, and manufacturer recommendations.