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Calcimator

Sump Pump Sizing Calculator

Size sump pumps based on pit dimensions, water inflow rate, discharge height, and calculate battery backup duration.

Inputs

inches
inches
GPM
ft
ft

Results

Required Pump Capacity

15 GPM

Recommended Pump HP

0.33 HP

Total Dynamic Head8.23 ft
Cycles per Hour37.8
Battery Backup Duration2.9 hours
How to Use This Calculator
  1. Enter the sump pit diameter and depth in inches to determine the working volume.
  2. Enter the water inflow rate in GPM — measure during a heavy rain event or estimate from drainage area.
  3. Set the discharge height in feet from the pump to the outlet point.
  4. Enter the total discharge pipe length including horizontal runs.
  5. Review Required Pump Capacity (GPM), Total Dynamic Head (ft), and Recommended Pump HP to select your pump.
  6. Note Battery Backup Hours to size a backup system for power outage protection.
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