Pond Calculator
Calculate pond volume, liner size, and installation costs for garden and fish ponds
Pond Details
Most common for garden ponds
Perfect for small water features
Natural looking option
Maximum length of the pond
Maximum width of the pond
Maximum depth of the pond (minimum 60cm for fish)
Pond Size & Volume
Surface Area
Volume Capacity
Liner Details
Liner extension around pond perimeter (recommended: 0.5m)
Liner Dimensions
Formula: Liner Length = Length + 2 × (Depth + Overlap)
Calculation: 1.00m × 1.00m = 1.00m²
💡 Note: Underlayment material has the same dimensions as the liner
Cost Estimation (Optional)
Price per square meter of liner material
Price per cubic meter of water
Example Calculation
Rectangular Garden Pond
Dimensions: 4m length × 3m width × 0.8m depth
Overlap: 0.5m around perimeter
Shape: Rectangular
Step-by-step Calculation
1. Pond area: 4m × 3m = 12 m²
2. Pond volume: 12 m² × 0.8m = 9.6 m³ = 9,600 liters
3. Liner length: 4m + 2×(0.8m + 0.5m) = 6.6m
4. Liner width: 3m + 2×(0.8m + 0.5m) = 5.6m
5. Liner area: 6.6m × 5.6m = 36.96 m²
Result: 9,600L capacity with 37m² liner needed
Depth Guidelines
Shallow Zone
Plants and marginal fish
Water features, small fish
Fish Zone
Minimum for fish survival
Overwinter protection
Deep Zone
Large fish, thermal mass
Optimal for koi ponds
Liner Types
Rubber (EPDM)
Flexible, durable, 20+ years
Best for large custom ponds
PVC
Economical, good flexibility
Medium-sized ponds
Pre-formed
Easy installation, fixed shapes
Small garden ponds
Installation Tips
Excavate 8cm deeper for underlayment
Remove all sharp rocks and roots
Use underlayment to protect liner
Center liner for even margins
Hide edges with rocks or soil
Understanding Pond Construction
Planning Your Pond
Building a pond requires careful planning of size, depth, and location. The volume calculation helps determine water capacity, while liner sizing ensures you have adequate coverage for excavation and installation needs.
Key Considerations
- •Location: Avoid overhanging trees and underground utilities
- •Depth: Minimum 60cm for fish overwinter survival
- •Drainage: Consider overflow and maintenance access
- •Electrical: Plan for pumps, lights, and filtration
Volume Formulas
Rectangular Pond
Volume = Length × Width × Depth
Circular Pond
Volume = π × (Diameter/2)² × Depth
Oval Pond
Volume = π × (L/2) × (W/2) × Depth
Liner Size Formula
Liner Length = Length + 2×(Depth + Overlap)
Liner Width = Width + 2×(Depth + Overlap)