Pipe Volume Calculator

Inputs

Internal Diameter (mm)

Common sizes: 150, 200, 300, 375, 450, 600, 750, 900mm

Pipe Length (m)

Fill Percentage (%)

For partial flow calculations.

For estimation purposes only. Terms of Use

Result

—

litres total capacity

Internal area—

Total volume—

Fill volume—

Weight of water—

→

Connected workflow Continue to the concrete workflow Pipe capacity carries forward with the project pour record.

Measure the internal diameter and the pipe length.

Area = π × (diameter ÷ 2)², then volume = area × length.

Multiply by the fill percentage for partial flow, and by 1,000 for litres.

Formula Used

Internal Area = π × (Diameter÷2)²
Total Volume = Area × Length
Fill Volume = Total Volume × Fill %

Worked Example

A 450mm diameter pipe, 100m long, 100% full:

Area = π × (0.225)² = 0.159 m²
Volume = 0.159 × 100 = 15.9 m³
= 15,900 litres

When to Use This Calculator

Use this for estimating fill volumes for hydrostatic testing, flushing requirements, pump sizing, or understanding storage capacity for culverts and storm sewer pipes.

When Not to Use This Calculator

This does not calculate flow rate or hydraulic capacity under pressure or gravity flow — those require Manning's equation or similar hydraulic calculations, not just volume.

Frequently Asked Questions

Should I use internal or external diameter? ▾

Always use internal diameter for volume calculations — this is the actual space available for water or material, not including pipe wall thickness.

How do I calculate partial fill volume? ▾

Use the fill percentage field — note this calculator assumes a simplified linear percentage, not the more complex circular segment geometry of actual partial-flow conditions.