🔧 Engineering Tool
Pipe Volume Calculator
Calculate the internal volume, capacity, and fluid weight of any pipe or pipeline instantly. Supports all SI (metric) and imperial units. Used by engineers, plumbers, inspectors, and project teams worldwide — free, no signup required.
Pipe Volume Calculator
Enter pipe dimensions and select units. Supports circular, hollow, and partial-fill pipes.
SI / Metric
Imperial / US
ASME B36.10M
ISO 4200
DN / NPS Sizes
Schedule Pipes
Partial Fill
Enter a valid outer diameter.
Enter a valid internal diameter.
Enter a valid pipe length.
Internal Volume
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Formula Used
V = π/4 × ID² × L — where ID is internal diameter and L is pipe length. For annular: V = π/4 × (ID₁² − OD₂²) × L.
All Units Supported
Results shown in litres, US gallons, Imperial gallons, cubic metres, cubic feet, and barrels (bbl).
Fluid Weight
Select a fluid type to automatically calculate the total weight of the fluid in the pipe in kg and tonnes.
Standards
Schedule/NPS data based on ASME B36.10M (carbon steel) and B36.19M (stainless steel) standards.
Common NPS Pipe Reference (STD Schedule)
| NPS / DN | OD (mm) | WT-STD (mm) | ID-STD (mm) | Vol / m (L/m) | Vol / m (gal/m) |
|---|
Volume Unit Conversions
| Unit | = Litres (L) | = m³ | = US Gallons | = Imp. Gallons |
|---|---|---|---|---|
| 1 Litre (L) | 1.000 | 0.001 | 0.2642 | 0.2200 |
| 1 Cubic Metre (m³) | 1,000 | 1.000 | 264.17 | 219.97 |
| 1 US Gallon (gal) | 3.7854 | 0.003785 | 1.000 | 0.8327 |
| 1 Imperial Gallon | 4.5461 | 0.004546 | 1.2009 | 1.000 |
| 1 Barrel (bbl / oilfield) | 158.987 | 0.15899 | 42.000 | 34.972 |
| 1 Cubic Foot (ft³) | 28.3168 | 0.02832 | 7.4805 | 6.2288 |
| 1 Cubic Inch (in³) | 0.01639 | 0.000016 | 0.00433 | 0.00360 |
Frequently Asked Questions
How do I calculate the volume of a pipe?
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The internal volume of a pipe is calculated using the formula: V = π/4 × ID² × L, where ID is the internal diameter and L is the pipe length. This tool handles all unit conversions automatically and displays results in litres, gallons, cubic metres, and barrels.
What is the difference between OD, ID, and Wall Thickness?
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OD (Outer Diameter) is the total outside measurement of the pipe. ID (Internal Diameter) is the clear bore inside the pipe — the actual flow path. Wall Thickness (WT) is the thickness of the pipe wall. The relationship is: ID = OD − (2 × WT). For volume calculations, only the ID matters.
What is a pipe schedule?
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A pipe schedule (such as Sch 40, Sch 80, or STD/XS/XXS) defines the wall thickness of a pipe of a given nominal size. Thicker schedules have smaller internal diameters for the same NPS. This tool uses ASME B36.10M data for carbon steel and B36.19M for stainless steel schedules.
How do I calculate the weight of fluid in a pipe?
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Weight = Volume × Fluid Density. Select the fluid type from the dropdown in the Basic Pipe tab, and the tool will automatically calculate the total fluid weight in kilograms and tonnes. You can also enter a custom density for any fluid.
What is an annular volume and when is it used?
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Annular volume is the volume of the ring-shaped space between two concentric pipes. It is calculated as V = π/4 × (ID₁² − OD₂²) × L. This is used in wellbore cementing, pipe-in-pipe systems, heat exchangers, and double-wall pressure vessels to calculate how much fluid fills the annular space.
What is a partial fill calculation?
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A partial fill calculation determines how much fluid is in a horizontal pipe when it is not completely full. The formula uses circular segment geometry: A = r² × arccos((r−h)/r) − (r−h) × √(2rh−h²), where r is the pipe radius and h is the depth of fluid. This tool calculates it automatically and shows the fill percentage.
What units does this calculator support?
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This calculator supports all major unit systems. For diameter: mm, cm, m, inches, feet. For length: mm, cm, m, km, inches, feet, yards, miles. Results are shown in litres, US gallons, Imperial gallons, cubic metres, cubic feet, and oil barrels (bbl). It is designed for global use by engineers in any country.
Is this calculator free to use?
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Yes, this tool is completely free. No sign-up, no download, and no payment is required. It works on all modern browsers across smartphones, tablets, and desktops.