# Sump Pump Size Calculator: 1/3 HP or 1/2 HP? | Sump Pump Toronto

> Measure your pit inflow and find the right sump pump size. Free calculator from a licensed Toronto sump pump installer.

URL: https://sumppumpinstallationtoronto.ca/tools/sump-pump-sizing-calculator/

# Sump Pump Sizing Calculator

Use a simple bucket-style pit test to estimate inflow and the pump capacity your basement needs.

Pit diameter18 in (standard)24 in (large / commercial)

Water rise in 1 minute (inches)

Unplug the pump, then measure how far water rises in 60 seconds. Never work in a pit with the pump plugged in.

Enter a value between 0.25 and 24.

Vertical lift to discharge (feet)

Enter a value between 3 and 20.

Recommended pump capacity (GPM)

3.3

Measured inflow (GPM)

2.2

Suggested horsepower

1/3 HP

Rule-of-thumb sizing only. Never work in a pit with the pump plugged in; unplug before measuring. A licensed plumber should confirm pump selection.

### Have a Plumber Confirm the Size

We flow-test your pit for free and size the pump to your inflow and head height.

## Related Services

Submersible Sump Pump Installation $1,700 - $3,000

[/submersible-sump-pump-installation/ →](/submersible-sump-pump-installation/)

 

Interior Sump Pump Installation $1,800 - $3,200

[/interior-sump-pump-installation/ →](/interior-sump-pump-installation/)

 

Sump Pump Replacement $1,500 - $2,800

[/sump-pump-replacement/ →](/sump-pump-replacement/)

Water rising now? 

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Free Assessment: Camera Scope + Flow Test + Subsidy Check

## Get Your Exact Written Quote

Honestly, that is the whole pitch. We would rather spend an hour at your house now than pump out a finished basement later.

Get In-Home Assessment & Quote

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Call 24/7: (437) 782-5911

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-   Published CAD pricing
-   2-year workmanship warranty
-   Licensed Master Plumber (ON)
-   City subsidy filed at $0