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Pond Liner Calculator

Calculate liner size for your pond

Liner Size

19.0 × 17.0 ft

Area

323 sq ft

Volume

1526 gal

Liner Size Needed

19.0 \u00D7 17.0 ft

Total Area

323 sq ft

Pond Volume

1526 gal

Underlayment Needed323 sq ft

Pond Capacity

Gallons1526
Liters5777

Liner Dimensions

Liner Length19.0 ft
Liner Width17.0 ft
Liner Area323 sq ft

Installation Tips

Use Underlayment

Install geotextile underlayment to protect liner from roots and rocks.

Install on a Warm Day

EPDM liner is more flexible when warm, making it easier to shape.

What You'll Need

TotalPond 900 GPH Waterfall Pump for Ponds

$45-$654.4
View on Amazon
AQUASCAPE 45 mil EPDM Rubber Pond Liner 10x15ft

AQUASCAPE 45 mil EPDM Rubber Pond Liner 10x15ft

$90-$1304.5
View on Amazon
OASE Filtral UVC 3000 All-in-One Pond Filter

OASE Filtral UVC 3000 All-in-One Pond Filter

$120-$1704.3
View on Amazon

TotalPond 900 GPH Waterfall Pump for Ponds

$45-$654.4
View on Amazon
AQUASCAPE 45 mil EPDM Rubber Pond Liner 10x15ft

AQUASCAPE 45 mil EPDM Rubber Pond Liner 10x15ft

$90-$1304.5
View on Amazon
OASE Filtral UVC 3000 All-in-One Pond Filter

OASE Filtral UVC 3000 All-in-One Pond Filter

$120-$1704.3
View on Amazon

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Example Calculations

1Small Garden Pond (10 x 8 ft, 3 ft deep)

Inputs

Length10 ft
Width8 ft
Max Depth3 ft
Edge Overlap1.5 ft

Result

Liner Size19.0 x 17.0 ft
Total Area323 sq ft
Pond Volume1526 gal

Liner length = 10 + (2 x 3) + (2 x 1.5) = 19.0 ft. Liner width = 8 + (2 x 3) + (2 x 1.5) = 17.0 ft. Area = 19 x 17 = 323 sq ft. Volume = 10 x 8 x (3 x 0.85) x 7.48052 = 1,526 gallons.

2Large Koi Pond (15 x 12 ft, 4 ft deep)

Inputs

Length15 ft
Width12 ft
Max Depth4 ft
Edge Overlap2 ft

Result

Liner Size27.0 x 24.0 ft
Total Area648 sq ft
Pond Volume4574 gal

Liner length = 15 + (2 x 4) + (2 x 2) = 27.0 ft. Liner width = 12 + (2 x 4) + (2 x 2) = 24.0 ft. Area = 27 x 24 = 648 sq ft. Volume = 15 x 12 x (4 x 0.85) x 7.48052 = 4,574 gallons.

Frequently Asked Questions

Q

How do I calculate pond liner size?

Liner size = Length + (2 × Depth) + (2 × Overlap) by Width + (2 × Depth) + (2 × Overlap). The overlap is typically 1-2 feet for securing the edges.

  • Example: 10 ft pond, 3 ft deep, 1.5 ft overlap = 10 + 6 + 3 = 19 ft liner length
  • Always measure at the widest and longest points of your excavation
  • For irregular shapes, use the bounding rectangle dimensions plus extra overlap
  • Add 6–12 inches if you plan shelves or planting ledges within the pond
Q

What overlap should I add for pond liner?

Add at least 1 foot of overlap on all sides. For larger ponds or those with rock edges, 1.5-2 feet provides better coverage and easier installation.

  • 1 ft overlap: sufficient for small decorative ponds under 50 sq ft
  • 1.5 ft overlap: recommended for most backyard ponds with rock edging
  • 2 ft overlap: ideal for ponds over 200 sq ft or those with heavy stone borders
  • Extra overlap can be trimmed after installation — it is much cheaper than being short
  • Secure overlap edges with flat stones, bricks, or landscaping staples
Q

Do I need underlayment under pond liner?

Yes, underlayment protects the liner from roots, rocks, and sharp objects. Use geotextile fabric or old carpet padding cut to the same size as your liner.

  • Geotextile underlayment costs $0.10–$0.25/sq ft and lasts the life of the liner
  • Remove all sharp rocks, roots, and debris from the excavation before laying underlayment
  • A 2-inch layer of sand ($15–$25 per ton) on the bottom adds extra puncture protection
  • Old carpet padding works but breaks down in 5–10 years; geotextile is the better choice
  • Skipping underlayment voids most EPDM liner warranties
Q

What thickness pond liner should I use?

For fish ponds, use 45 mil EPDM or thicker. Decorative ponds can use 20-30 mil. Koi ponds with larger fish should use 60 mil for extra durability.

  • 20 mil PVC: $0.15–$0.30/sq ft — budget option for small decorative water features
  • 30 mil PVC: $0.25–$0.45/sq ft — good for plant-only ponds without fish
  • 45 mil EPDM: $0.50–$0.85/sq ft — standard for goldfish and garden ponds
  • 60 mil EPDM: $0.75–$1.25/sq ft — recommended for koi ponds and rocky substrates
  • EPDM rubber is fish-safe and lasts 20–30 years; PVC typically lasts 10–15 years
Liner TypeThicknessCost per sq ftLifespanBest For
PVC20–30 mil$0.15–$0.4510–15 yearsSmall decorative ponds
EPDM Rubber45 mil$0.50–$0.8520–30 yearsGoldfish & garden ponds
EPDM Rubber60 mil$0.75–$1.2525–30+ yearsKoi ponds & rocky sites

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Last Updated: Mar 26, 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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