Pipe Volume Calculator — Cubic Metres (m³)
For water mains, storage lines and civil works, cubic metres is the working unit. This pipe volume calculator in m³ turns a bore and length into cubic metres, with litres and m³-per-metre alongside so small and large lines are both easy to read.
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| متى | ID | الطول | النتيجة |
|---|
Cubic metres is the default. For smaller pipes the litres card is usually easier to read.
Cubic metres, the SI volume
One cubic metre is 1,000 litres — a large unit that suits mains, culverts and bulk lines but leaves small pipes reading as tiny decimals. The calculator shows litres in the same panel so you can pick whichever scale is comfortable. The core relationship is:
m³ = π × (IDm / 2)² × Lm
A mains-scale example
Consider 500 m of DN300 (12-inch) pipe with a 300 mm bore. Area = π × (0.15)² = 0.0707 m²; volume = 0.0707 × 500 = 35.3 m³, or 35,300 litres. That single figure drives disinfection dosing, fill time and the water a section loses when it is taken out of service — all of which the tool can estimate from the same inputs.
Cubic metres conversions
- 1 m³ = 1,000 litres = 264.17 US gallons = 219.97 Imperial gallons.
- 1 m³ = 35.315 cubic feet = 1.308 cubic yards.
- 1 m³ of water ≈ 1,000 kg (one tonne).
Where cubic metres matters
Municipal and industrial water networks plan disinfection and flushing by the cubic metre. Civil projects reconcile pipe contents against tanker and storage volumes in m³. Process plants log line inventory in m³ for mass balances. In each case the internal volume is the starting point, and the tonne of water inside a large main is a load worth knowing before a section is drained or filled.
Getting an accurate m³ figure
Two things keep large-line estimates honest. First, use the real bore — for plastic mains that means the OD and the SDR/DR, not the nominal size. Second, decide whether the line is truly full: gravity sewers and part-charged mains should use the fill-level setting. With those in place the cubic-metre figure is a dependable planning number.
قراءة نتيجتك والثقة بها
Here is how to read the number this pipe volume calculator in m3 gives you, and where it stops being exact.
ما يمثله الرقم
The headline value is the internal capacity of a round, uniform pipe running full — the fluid the bore can hold along the length you entered. Every other unit on the panel is the same physical quantity re-expressed, so you can quote whichever your paperwork needs without recalculating.
افتراض الأنبوب الممتلئ
By default the figure assumes the pipe is completely full and perfectly cylindrical. For gravity drains and vented lines that run part full, set a fill level below 100% and the result scales with it. Bends, valves and fittings add a little capacity the straight-length model does not see — use the fittings allowance to approximate them.
جداول مرجعية للسعة ومثال محلول
Concrete numbers for this page, calculated the same way the tool above does — use them as a quick check or a lookup.
Schedule 40 2" pipe: volume by run length
How much a 2" Schedule 40 bore holds as the run gets longer, in m³. Multiply or interpolate for your exact length.
| Length (m) | Volume (m³) | Per metre |
|---|---|---|
| 3 m | 0.0065 | 0.0022 |
| 8 m | 0.0173 | 0.0022 |
| 15 m | 0.0325 | 0.0022 |
| 30 m | 0.0649 | 0.0022 |
| 75 m | 0.1624 | 0.0022 |
| 150 m | 0.3247 | 0.0022 |
Schedule 40 pipe: volume across sizes
Volume held by a fixed 30 m run across common Schedule 40 sizes, in m³. Because the bore is squared, capacity climbs fast with size.
| الحجم الاسمي | التجويف (in) | Volume in 30 m (m³) |
|---|---|---|
| 1/2" | 0.622 | 0.0059 |
| 3/4" | 0.824 | 0.0103 |
| 1" | 1.049 | 0.0167 |
| 1-1/2" | 1.610 | 0.0394 |
| 2" | 2.067 | 0.0649 |
| 3" | 3.068 | 0.1431 |
| 4" | 4.026 | 0.2464 |
| 6" | 6.065 | 0.5592 |
مثال محلول، خطوة بخطوة
- Bore = 2.067 in = 0.0525 m, so radius = 0.02625 m.
- Area = π × radius² = 0.002165 m².
- Volume = area × length = 0.002165 × 25 = 0.05412 m³.
- Convert: 0.05412 m³ = 0.0541 m³ for a 25 m run.
الأسئلة الشائعة
How do I calculate pipe volume in cubic metres?
Work in metres throughout: area = π × (bore/2)², then multiply by length. The calculator converts mm and any length unit to m³ for you.
How many litres in a cubic metre of pipe?
Exactly 1,000 litres per cubic metre. The result shows both so you can read whichever suits the pipe size.
How much does a cubic metre of water in a pipe weigh?
About 1,000 kg, or one tonne. The weight card shows the exact figure for your chosen fluid.
Should I use nominal size for a large plastic main?
No — use the outside diameter with the SDR or DR, which the HDPE option handles. Nominal size overstates the bore and therefore the m³.
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What people say
Used the litres-per-metre figures to size a glycol charge for a radiant job. Numbers matched the datasheet.
Switches between US and metric without losing the pipe. Small thing, big time-saver.
Would love more HDPE DIPS sizes, otherwise excellent.