Pond & Water Feature Volume Calculator

Calculate your pond's volume in gallons, determine the right liner size, and find the correct pump GPH for any shape.

Length (ft)

Width (ft)

Average Depth (ft)

Pump & Waterfall

Turnover Target (hours)

Waterfall Width (in)

Liner Pricing (edit to match local rates)

EPDM Rubber ($/sq ft)

PVC ($/sq ft)

Preformed Liner ($)

Pond Cross-Section

Pond Volume

1,346 gal

180.0 cu ft

Liner Size

18.0' × 14.0'

252 sq ft

Pump Needed

898 GPH

1.5hr turnover

Best Liner Price

$126.00

PVC Liner

Purchase Option	Quantity	Est. Cost
EPDM Rubber Liner	252 sq ft	$189.00
PVC LinerBest value	252 sq ft	$126.00
Preformed Liner	1 unit	$250.00

Best value: PVC Liner at $126.00PVC liner is the most affordable option for your 252 sq ft pond. PVC is lightweight and easy to install but has a shorter lifespan (10–15 years) compared to EPDM rubber.

Fish stocking guidelineFor koi ponds, the general rule is 1 inch of fish per 10 gallons. Your 1,346-gallon pond could support roughly 135 inches of total fish length (e.g., 11 fish at 12" each). Always add fish gradually and ensure adequate filtration.

This is an estimate for planning purposes. Actual volumes may vary based on exact pond shape, shelving, and construction method. Always consult a pond specialist for large or complex water features. Liner prices vary by brand and region — update the pricing inputs to match your local suppliers.