Pipe Volume Per Foot Calculator
Field estimating is quick when you know the per-foot capacity. This pipe volume per foot calculator gives gallons per foot and litres per metre for any bore, and the table below covers the common Schedule 40 sizes so you can estimate in your head.
हर इकाई में समान आयतन
तरल भार
अनुमानित भराव / निकासी समय
आपकी हाल की गणनाएं (इस डिवाइस पर सहेजा गया)
| कब | ID | लंबाई | परिणाम |
|---|
The result panel shows capacity per foot and per metre for whatever bore you enter.
Why per-foot is the estimator's number
Most real jobs are "so many feet of such-and-such pipe". If you know how much a single foot holds, the whole run is one multiplication away. That is why gallons per foot (or litres per metre) is the figure tradespeople actually memorise. Enter any bore above and the result panel gives both, alongside the total for your specific length.
Gallons per foot — Schedule 40
| नाममात्र आकार | Inside diameter | US gal / ft | US gal / 100 ft |
|---|---|---|---|
| 1/2" | 0.622" | 0.016 | 1.58 |
| 3/4" | 0.824" | 0.028 | 2.77 |
| 1" | 1.049" | 0.045 | 4.49 |
| 1-1/4" | 1.380" | 0.078 | 7.77 |
| 1-1/2" | 1.610" | 0.106 | 10.58 |
| 2" | 2.067" | 0.174 | 17.43 |
| 2-1/2" | 2.469" | 0.249 | 24.87 |
| 3" | 3.068" | 0.384 | 38.40 |
| 4" | 4.026" | 0.661 | 66.13 |
| 5" | 5.047" | 1.039 | 103.93 |
| 6" | 6.065" | 1.501 | 150.08 |
| 8" | 7.981" | 2.599 | 259.88 |
| 10" | 10.020" | 4.096 | 409.63 |
| 12" | 11.938" | 5.815 | 581.46 |
| 24" | 22.624" | 20.883 | 2088.32 |
How per-foot capacity is derived
Per-foot capacity is just the volume of a one-foot length:
gal / ft = π × (ID/2)² × 12 ÷ 231
ID in inches; 12 in per foot; 231 in³ per US gallon.
Because the bore is squared, capacity grows quickly with size. A 4-inch pipe holds about four times as much per foot as a 2-inch pipe, not twice — a useful rule of thumb when you jump up a size.
Common size questions
People often search by a specific size: how much does 2-inch pipe hold per foot, or 4-inch, or 6-inch? The table answers the popular ones for Schedule 40, but the calculator is the reliable route for any material and schedule, since the per-foot figure depends on the true bore — and PEX, copper types and plastic schedules all have different bores for the same nominal size.
Where per-foot capacity is used
- Line fill and flush estimates — multiply per-foot by length.
- रासायनिक खुराक — total gallons drive the dose.
- Antifreeze and glycol charges — loop feet × per-foot gives the volume to mix.
- Quick take-offs — estimate a job's water content from a length on a drawing.
Per metre for metric work
The same idea in metric is litres per metre. The result panel shows it beside the per-foot figure, so metric and imperial jobs are both a single multiplication from a total. Whichever unit you work in, the per-length figure is the shortcut that turns a length into a volume on the spot.
अपने परिणाम को पढ़ना और विश्वास करना
The result above answers most questions; this note covers how to interpret it and its limits.
What the number actually means
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.
पूर्ण-पाइप अनुमान
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.
क्षमता संदर्भ तालिकाएं और एक हल किया गया उदाहरण
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 US gal. The per-foot figure is constant, so any length is one multiplication away.
| लंबाई (ft) | Volume (US gal) | Per foot |
|---|---|---|
| 10 ft | 1.74 | 0.1743 |
| 25 ft | 4.36 | 0.1743 |
| 50 ft | 8.72 | 0.1743 |
| 100 ft | 17.43 | 0.1743 |
| 250 ft | 43.58 | 0.1743 |
| 500 ft | 87.16 | 0.1743 |
Schedule 40 pipe: volume across sizes
Volume held by a fixed 100 ft run across common Schedule 40 sizes, in US gal. Doubling the diameter roughly quadruples the capacity.
| नाममात्र आकार | बोर (in) | Volume in 100 ft (US gal) |
|---|---|---|
| 1/2" | 0.622 | 1.58 |
| 3/4" | 0.824 | 2.77 |
| 1" | 1.049 | 4.49 |
| 1-1/2" | 1.610 | 10.58 |
| 2" | 2.067 | 17.43 |
| 3" | 3.068 | 38.40 |
| 4" | 4.026 | 66.13 |
| 6" | 6.065 | 150.1 |
हल किया गया उदाहरण, चरण दर चरण
- Bore = 2.067 in, so radius = 1.0335 in.
- Area = π × radius² = 3.3556 in².
- Length = 75 ft = 900 in; volume = 3.3556 × 900 = 3,020.0 in³.
- Convert to the unit you need: 13.07 US gal for a 75 ft run of Schedule 40 2" pipe.
अक्सर पूछे जाने वाले प्रश्न
How much water is in a pipe per foot?
It depends on the bore. A foot of 1-inch Schedule 40 holds about 0.045 US gallons; 2-inch about 0.174; 4-inch about 0.661. Enter your size above for the exact per-foot and per-metre figures.
What is gallons per foot for 2 inch pipe?
About 0.174 US gallons per foot for 2-inch Schedule 40 (2.067 in bore), which is roughly 17.4 gallons per 100 ft.
How do I calculate gallons per foot?
gal/ft = π × (ID/2)² × 12 ÷ 231, with the inside diameter in inches. The calculator does this for any bore and also gives litres per metre.
Does per-foot capacity change with material?
Yes, because the bore changes. Same-nominal PEX, copper and PVC all hold different amounts per foot, so pick the right material for an accurate figure.
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What people say
Gallons per foot is my whole day — this is the first tool that gives it straight without me converting.
I taped the per-foot table to the truck. Saves a calculation on every top-up.
Would like a printable per-metre card too, but the numbers are spot on.