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Sump Pump Calculator — GPH Sizing Tool

Calculate sump pump horsepower by pit size, water table level, and discharge requirements

Required GPH

2,899

HP

0.5 HP

Annual

$67/yr

Battery backup system

Pump Sizing

Recommended
0.5 HP
2,899 GPH @ 10 ft head
Watts
600W
Pit Volume
26 gal

Cost Estimate

Pump$120 – $300
Installation$300 – $800
Battery Backup$300
Total$720 – $1,400
Annual Energy$67/yr (480 kWh)

Sizing Guide

HPGPHBest For
1/3Up to 1,800Light use, low water table
1/2Up to 3,000Most residential
3/4Up to 4,500High water table
14,500+Heavy flooding, long runs

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Example Calculations

1Standard Residential

Inputs

ProjectMedium home
ScopeStandard

Result

ResultSee calculator

Enter your dimensions for accurate estimates.

2Large Project

Inputs

ProjectLarge home
ScopeFull

Result

ResultSee calculator

Larger projects need proportionally more materials.

Frequently Asked Questions

Q

How does this calculator work?

Enter your project dimensions and specifications to get material quantities, sizing, and cost estimates based on industry-standard formulas.

  • Input dimensions and project specs for accurate results
  • Calculations use standard industry formulas and sizing tables
  • Results include material quantities and cost ranges
  • Adjust inputs to compare different scenarios
Q

How accurate are these estimates?

Material quantities are within 5–10% of actual needs including waste. Cost estimates use national averages and vary 20–30% by region.

  • Material quantities accurate within 5–10% with waste factor
  • Cost estimates based on national averages, vary by region
  • Sizing follows industry standards and building codes
  • Verify with local codes and professional assessment
Q

Should I hire a professional?

Many aspects are DIY-friendly, but electrical, plumbing, and structural work typically require permits and professional expertise.

  • DIY-friendly: material purchasing, basic assembly, surface work
  • Professional recommended: electrical, plumbing, structural changes
  • Always check local codes and permit requirements first
  • Professional install adds 40–60% but ensures code compliance
Q

What building codes apply?

Building codes vary by jurisdiction but generally follow IRC for residential. Check with your local building department for specific requirements.

  • IRC covers most residential construction requirements
  • Electrical work: NEC applies nationwide
  • Plumbing: UPC or IPC depending on jurisdiction
  • Always pull required permits to maintain insurance coverage

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Last Updated: Mar 19, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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