Pond Calculator

Q: How many fish can I stock?

Follow the rule of 1 inch of fish per 10 gallons of water. For example, a 1,000-gallon pond can support 100 inches of fish total.

Q: What size pump do I need?

The pump should circulate the total pond volume in 1-2 hours. For a 1,000-gallon pond, you need a 500-1,000 GPH pump.

Q: How often should I clean the pond?

Perform partial water changes monthly (10-20%) and full cleaning annually. Clean filters monthly and test water quality weekly.

Q: What affects pond volume?

Pond volume is affected by shape, dimensions (length, width), depth (average and maximum), and side slope ratios.

Q: How do I maintain water quality?

Regular water testing, proper filtration, monthly water changes, and monitoring fish health are essential for maintaining good water quality.

Pond Dimensions

Pond Shape

Select pond shape

Length

Length of the pond

Width

Width of the pond

Average Depth

Average depth of the pond

Maximum Depth

Maximum depth of the pond

Side Slope

Slope ratio (e.g., 3:1)

Calculation Results

Pond Calculator: Your Guide to Pond Volume and Requirements

Planning a pond installation or maintenance? Our Pond Calculator helps you determine the exact volume of water your pond can hold and provides essential information for proper pond management.

Understanding Pond Volume

Pond volume calculations are important for several reasons:

Water Management: Proper water circulation
Fish Stocking: Correct fish population
Filtration: Appropriate pump sizing
Treatment: Chemical dosing
Cost Estimation: Water and maintenance costs

How to Use the Pond Calculator

Select Pond Shape: Choose the pond configuration
Enter Length: Input the pond length
Enter Width: Input the pond width
Enter Average Depth: Input the average depth
Enter Maximum Depth: Input the maximum depth
Enter Side Slope: Input the slope ratio
Click Calculate: Get volume and requirements

Pond Volume Calculation Formula

Rectangular Pond:
Volume = Length × Width × Average Depth

Circular Pond:
Volume = π × (Diameter/2)² × Average Depth

Oval Pond:
Volume = π × (Length/2) × (Width/2) × Average Depth

Irregular Pond:
Volume = Surface Area × Average Depth × 0.85

Surface Area Formula:
Surface Area = Length × Width

Common Pond Types and Requirements

Garden Ponds:
- Typical Size: 6' × 8' to 12' × 15'
- Average Depth: 2' to 3'
- Volume Range: 500 to 2,000 gallons
Koi Ponds:
- Typical Size: 10' × 15' to 20' × 30'
- Average Depth: 4' to 6'
- Volume Range: 2,000 to 10,000 gallons
Natural Ponds:
- Typical Size: 20' × 30' to 50' × 100'
- Average Depth: 5' to 10'
- Volume Range: 10,000 to 100,000 gallons
Farm Ponds:
- Typical Size: 50' × 100' to 200' × 400'
- Average Depth: 8' to 15'
- Volume Range: 100,000 to 1,000,000 gallons

Real-World Examples

Example 1: Standard Koi Pond

Pond Shape: Rectangular
Length: 15 feet
Width: 10 feet
Average Depth: 4 feet
Maximum Depth: 6 feet
Side Slope: 3:1
Results:
- Volume: 4,500 gallons
- Surface Area: 150 square feet
- Fish Capacity: 15-20 koi
- Recommended Pump: 2,250 GPH
- Filtration: 4,500 GPH

Example 2: Garden Pond

Pond Shape: Circular
Diameter: 8 feet
Average Depth: 2.5 feet
Maximum Depth: 3 feet
Side Slope: 2:1
Results:
- Volume: 1,000 gallons
- Surface Area: 50 square feet
- Fish Capacity: 5-10 goldfish
- Recommended Pump: 500 GPH
- Filtration: 1,000 GPH

Frequently Asked Questions

How many fish can I stock?

1 inch of fish per 10 gallons of water.

What size pump do I need?

Pump should circulate total volume in 1-2 hours.

How often should I clean the pond?

Partial water changes monthly, full cleaning annually.

What affects pond volume?

Shape, dimensions, depth, and slope.

How do I maintain water quality?

Regular testing, proper filtration, and water changes.