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Pipe Volume Calculator

Calculate internal pipe capacity in liters and cubic meters from inside diameter and length.

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Inside diameter (mm)Length (m)

Use the actual internal diameter, not the nominal or outside diameter. This estimates contained volume, not flow rate or pressure.

Dynamic diagram

⚠️ Results are estimates for takeoff and planning. Do not use them as a substitute for structural design, specifications or local building codes; consult a qualified professional when required.

🔎 Calculate pipe capacity from inside diameter

Enter the actual inner diameter in millimeters and pipe length in meters to calculate contained liters, cubic meters and liters per meter, plus an estimated water weight.

Do not substitute nominal pipe size or outside diameter. This volume estimate does not model liquid flow or pressure drop.

Contained volume in liters and cubic meters.
Volume per meter of pipe.
Inside-diameter accuracy guidance.

Worked examples and practical tips

Always use the actual inner diameter, not the nominal or outside pipe diameter.

100 mm inside diameter, 10 m long

The contained volume is about 78.54 liters, or 7.854 liters per meter.

π × (0.1 ÷ 2)² × 10 × 1000 ≈ 78.54 L

Inside versus outside diameter

Using outside diameter without subtracting wall thickness overestimates the capacity.

Enter inside diameter in millimeters

💡 Calculation notes

Enter the actual inside pipe diameter in millimeters and length in meters to estimate contained volume in liters, cubic meters and liters per meter.

The result is static contained volume in liters and cubic meters.
Estimated full-pipe water weight assumes about 1 kg per liter; other fluids differ.
It does not calculate flow rate, velocity or pressure loss.

ℹ️ How to use

Enter your data or choose the required file.
Adjust the available options.
Run the tool and review the result.
Copy or download the result when needed.