Water Feature & Pond Pump Calculator | LandscapeCalculating.com

Water Feature & Pond Pump CalculatorSize a pond or fountain water feature: water volume in gallons, pump flow rate (GPH), liner area and evaporation refill for any pond or basin.Free water feature & pond pump calculator with formulas, waste factors, cost estimates and professional guidance.Formula: gallons = L × W × D × 7.48; pump GPH = max(volume ÷ turnover hrs, weir in × 100) × (1 + head × 0.04)How to use this calculator

Enter the pond length, width and average depth to get water volume in gallons.

Set the waterfall weir width and total head height to size the pump for both turnover and falls effect.

The liner size accounts for depth, shelves and edge overlap automatically.

Frequently asked questions

How do I calculate what size pond pump I need?

Turn the pond volume over at least once every two hours, and size a waterfall at 100 GPH per inch of weir width, then add roughly 4% per foot of head height. This tool returns the recommended GPH.

How many gallons is my pond?

Multiply length × width × average depth in feet, then by 7.48 gallons per cubic foot. A 10 × 6 × 2 ft pond holds about 898 gallons.

What size liner do I need for my pond?

Add twice the maximum depth plus 2 ft of overlap to both length and width. This calculator returns the exact liner and underlayment dimensions.

How much does a water feature cost to install?

Installed backyard pond and waterfall features typically run $15–$30 per gallon of volume; this calculator multiplies your pond gallons by a per-gallon installed price.

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