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Free pond liner calculator & pond liner size calculator in feet. Calculate how much pond liner you need, pond liner measurements & koi pond liner calculator. Our calculator determines liner size, costs, installation complexity, and material requirements for successful pond building projects.
Last updated: February 2, 2026
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Deepest point of the pond
Overlap beyond pond edge for anchoring
Liner Length
22.0 ft
Liner Width
18.0 ft
Total Liner Area
396 ft²
Project Type:
Large Project
Total Cost Estimate:
Installation Complexity:
Advanced
Additional Materials:
Tools Needed:
Recommendations:
Maintenance & Lifespan:
Size formula in feet
Length + (2 × Depth) + (2 × Overlap)
Works for rectangular, oval, round, and custom pond shapes
Koi pond considerations
Extra depth + fish safety materials
Includes deeper excavation and fish-safe liner recommendations
Measurement steps
1. Measure pond 2. Add depth 3. Add overlap
Simple 3-step process for accurate liner sizing
Area calculation
Length × Width = Total Area
Includes shape factors for curves and irregular edges
Cost per square foot
$0.75 - $4.50 per ft²
PVC, EPDM, Butyl, and Reinforced liner pricing
Common sizes
8×6, 12×8, 16×10, 20×12
Pre-calculated liner sizes for popular pond dimensions
12' × 8' × 3' rectangular pond with EPDM liner and geotextile:
Liner Size
22' × 18'
Total Area
396 ft²
Estimated Cost
$930
Our pond liner calculator uses landscape engineering and water feature construction principles to determine optimal liner dimensions and materials. The algorithm considers pond geometry, depth requirements, edge overlap, and shape complexity for accurate material planning and cost estimation.
Liner Length = Pond Length + (2 × Depth) + (2 × Edge Overlap)Liner Width = Pond Width + (2 × Depth) + (2 × Edge Overlap)This formula ensures complete pond coverage with proper depth accommodation and edge anchoring. Shape factors adjust for curves and irregular forms: oval (+15%), kidney (+25%), natural (+35%).
Shows liner placement, depth measurements, edge overlap, and underlayment positioning
Successful pond construction requires precise liner sizing, proper excavation, and quality materials. The liner must accommodate the full pond depth, provide adequate edge overlap for anchoring, and include extra material for shape complexity. Underlayment protection prevents punctures and extends liner life.
Planning more outdoor projects? Try our pool salt calculator for water maintenance or check out diving calculators for aquatic adventures.
Get Custom Landscaping Calculator for Your BusinessResult: 22' × 18' EPDM liner (396 ft²) with geotextile underlayment, total cost $931
Installation: Intermediate difficulty, 8-hour project, expected 20-25 year lifespan
16×10×4 foot koi pond
Liner size: 28×22 feet (616 ft²)
10×6×2 foot oval pond
Liner size: 18×14 feet (252 ft²)
Share it with fellow landscapers and help them build beautiful water features
Suggested hashtags: #PondConstruction #WaterGarden #Landscaping #DIYPond #BackyardPond