Pipe Volume Calculator — Cubic Yards
Same volume in every unit
Fluid weight
Estimated fill / drain time
Your recent calculations (saved on this device)
| When | ID | Length | Result |
|---|
Cubic yards suits large lines and grout estimates. The cubic-feet card helps for smaller pipes.
How to use this calculator
- Choose the unit system — US, Imperial or metric — at the top of the calculator.
- Pick the pipe type and schedule, then the nominal size, and the real inside diameter loads for you. Or choose Custom and type any bore.
- Enter the pipe length. Open Advanced to set fill level, number of identical runs, a fittings allowance, the fluid, or a flow rate.
- Press Calculate to see the volume in every unit, plus fluid weight, cross-section area and fill or drain time.
- Copy, share or print the result. Recent calculations are saved on your own device so you can reopen them later.
Tip: not sure where to start? Use the Fill example data button to load a complete worked example — a 2-inch Schedule 40 line, 50 ft long, at 10 gal/min — then adjust the numbers to match your job.
Real-world uses, with numbers
Charging a radiant-heat loop
How much water sits in a 300 ft run of ½" PEX.
≈ 2.9 US galSizing a well pressure tank
Line-fill volume in 100 ft of 1" Schedule 40.
≈ 4.5 US galFlushing a main
Water to displace in 100 ft of 4" Schedule 40.
≈ 66 gal · 250 LWater weight on hangers
Load from a full 100 ft run of 2" pipe.
≈ 145 lb · 66 kgMetric heating fill
Charge volume for 50 m of 28 mm bore.
≈ 30.8 LFuel or oil line contents
Diesel held in 20 m of 50 mm bore.
≈ 39 L · 33 kgMore questions, answered
How do I convert between gallons, litres and cubic metres?
1 US gallon = 3.785 litres; 1 Imperial gallon = 4.546 litres; 1 m³ = 1,000 litres = 264.2 US gallons. The calculator shows all of them from a single entry, so you never convert by hand.
Does the pipe material change the volume?
Only through the bore. Two pipes with the same inside diameter hold the same volume whether they are steel, PVC, copper or PEX. Material and schedule matter because they set the real inside diameter for a given nominal size.
How much does the water inside a pipe weigh?
About 8.34 lb per US gallon, or 1 kg per litre. A full 100 ft run of 2" Schedule 40 holds roughly 17.4 gallons, about 145 lb. Set the fluid in Advanced for hot water, glycol, diesel or seawater.
What if I only know the outside diameter?
Switch the diameter to OD mode and enter the wall thickness; the tool subtracts two wall thicknesses to reach the bore. For a listed standard, just pick the size and the published inside diameter loads automatically.
Can I use it for a part-full or sloped drain?
Yes for a straight, round pipe: open Advanced and set the fill level below 100%, and the volume scales with it. Truly partial gravity flow in a sloped line follows a curved free surface, so treat the part-full figure as an approximation.
Notes and derived figures
- Volume scales with the square of the bore: doubling the inside diameter roughly quadruples the capacity, while doubling the length only doubles it.
- Per-foot and per-metre capacity are constant for a given bore, so any length is a single multiplication — handy for quick field estimates.
- Nominal size is a label. A "2-inch" Schedule 40 pipe has a 2.067-inch bore; using "2" overstates the volume by more than a third.
- Fill and drain time is volume divided by flow rate. Enter a flow rate in Advanced to turn any result into a charge, flush or drain time.
Why cubic yards for pipe volume
Most pipe fluids are counted in gallons or litres, but cubic yards shows up whenever a pipe interacts with bulk materials: filling an abandoned line with grout, estimating flowable fill, or reconciling the internal space of a large culvert against concrete or slurry ordered by the yard. Because a cubic yard is 27 cubic feet, only large pipes give tidy numbers — small bores are easier to read in ft³ or gallons.
Cubic yards from the dimensions
Find the volume in cubic feet, then divide by 27:
yd³ = [ π × (IDft/2)² × Lft ] ÷ 27
Example: a 100 ft run of 24-inch pipe (bore 22.624 in = 1.885 ft) has an area of 2.791 ft² and a volume of 279.1 ft³, which is about 10.3 cubic yards. If you were grouting that line to abandon it, that is close to the neat grout volume before shrinkage and losses.
Cubic yards conversions
- 1 cubic yard = 27 cubic feet = 201.97 US gallons.
- 1 cubic yard = 0.7646 cubic metres = 764.6 litres.
Typical cubic-yard jobs
Line abandonment and grouting, large culvert and storm-drain contents, slurry and flowable-fill estimating, and any reconciliation against material bought by the yard are the usual reasons to want yd³. Add a fittings or over-order allowance when you are buying grout, since real placements always lose some volume to losses and irregular geometry.
Estimating vs pouring
The calculator gives the neat internal volume. When you are ordering grout or fill, add a practical allowance (often 5–15%) for over-break, spillage and pump losses. The fill-level and fittings settings help you build that into the estimate rather than doing it on the back of an envelope.
Reading and trusting your result
Before you act on the output, it helps to know exactly what this pipe volume calculator cubic yards is and isn't measuring.
Reading the output correctly
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.
The full-pipe assumption
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.
Capacity reference tables & a worked example
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 yd³. The per-foot figure is constant, so any length is one multiplication away.
| Length (ft) | Volume (yd³) | Per foot |
|---|---|---|
| 10 ft | 0.0086 | 8.63e-04 |
| 25 ft | 0.0216 | 8.63e-04 |
| 50 ft | 0.0432 | 8.63e-04 |
| 100 ft | 0.0863 | 8.63e-04 |
| 250 ft | 0.2158 | 8.63e-04 |
| 500 ft | 0.4315 | 8.63e-04 |
Schedule 40 pipe: volume across sizes
Volume held by a fixed 100 ft run across common Schedule 40 sizes, in yd³. Doubling the diameter roughly quadruples the capacity.
| Nominal size | Bore (in) | Volume in 100 ft (yd³) |
|---|---|---|
| 1/2" | 0.622 | 0.0078 |
| 3/4" | 0.824 | 0.0137 |
| 1" | 1.049 | 0.0222 |
| 1-1/2" | 1.610 | 0.0524 |
| 2" | 2.067 | 0.0863 |
| 3" | 3.068 | 0.1901 |
| 4" | 4.026 | 0.3274 |
| 6" | 6.065 | 0.7431 |
Worked example, step by step
- 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: 0.0647 yd³ for a 75 ft run of Schedule 40 2" pipe.
Frequently asked questions
How do I calculate pipe volume in cubic yards?
Compute the volume in cubic feet, then divide by 27. The calculator handles the conversion and shows ft³ and gallons alongside the yd³ figure.
How many cubic feet in a cubic yard?
Exactly 27 cubic feet make one cubic yard.
Can I use this to estimate grout to fill a pipe?
Yes — the internal volume is your neat grout volume. Add a 5–15% allowance for losses and over-break when you place your order.
Why does my small pipe read close to zero cubic yards?
A cubic yard is a large unit. For small pipes use the cubic-feet or gallons card instead.
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What people say
Sizing spoil and backfill volumes around large pipe — the yd³ output dropped straight into my estimate.
Clear cubic-yard number for big-bore runs without me dividing by 27 in my head.
Does exactly what I need for storm pipe; more RCP sizes would be welcome.