Enter your pipe runs, pipe size, material, and fitting counts to instantly get total developed length, equivalent fitting length, sticks to buy, and a complete materials list — ready for the hardware store.
PVC is for cold water and drain/vent only — not rated for hot water. Use CPVC or copper for hot supply lines. Check local code for approved materials.
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3/4 in is the most common residential supply pipe size. For drain/waste/vent (DWV), toilets typically use 3–4 in; sink drains use 1.5–2 in.
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ftft per stick/coil
Pipe Runs (Straight Lengths)
Add each straight pipe run. "Developed length" is the real measured distance pipe travels — horizontal, vertical, and around corners separately before you add fittings.
Fittings Count
Enter the number of each fitting type. The calculator converts each fitting to its equivalent straight-pipe length using standard Le/D ratios for your pipe size, then adds it to your total.
Results
Enter pipe runs & fittings, then hit Calculate
Sticks / Coils to Buy
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incl. 10% waste
Total Order Length
—
with 10% waste factor
Developed Length
—
straight runs only
Fittings Equiv. Length
—
added to total
Total System Length
—
runs + fittings equiv.
Total Fittings
—
all types combined
Material Advisory
Detailed Breakdown
Pipe & Material
Pipe material
—
Nominal pipe size
—
Inside diameter (actual)
—
Pipe sold as
—
Pipe Runs
Total developed length
—
Fittings Summary
Fittings equivalent length
—
Total system length
—
Order Calculation
Waste / cut allowance
—
Total length to order
—
Sticks / coils to buy
—
Total pipe purchased
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Fittings Breakdown
Fittings detail
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How Plumbing Pipe Length Calculations Work
Accurate pipe estimation has two parts: (1) developed length — the real physical distance pipe travels through walls, floors, and ceilings measured run by run, and (2) equivalent length — extra pipe length that accounts for friction losses through fittings. Add both together, apply a 10% cut waste factor, then divide by your stick length to find how many sticks to buy. Every fitting creates flow resistance equivalent to additional pipe length — a globe valve on a 3/4 in line adds roughly 20 ft of equivalent pipe.
1 Developed Length
Measure every pipe run — horizontal runs in walls or under floors, vertical drops or risers, and any offset sections. Add them all together. Do NOT add fitting lengths here — that's the next step.
Developed Length =
Run 1 + Run 2 + ...
Example:
10 ft horizontal +
4 ft vertical riser +
6 ft horizontal
= 20 ft developed
2 Fitting Equiv. Length
Each fitting type has a standard Le/D ratio (equivalent length ÷ inside diameter). Multiply by pipe ID to get equivalent feet per fitting, then multiply by count. All fittings are summed.
Equiv. length/fitting =
Le/D × Pipe ID (ft)
Example: 90° elbow
Le/D = 30 · ID = 0.0687 ft
= 2.06 ft per elbow
5 elbows = 10.3 ft equiv.
3 Total System Length
Add developed length and fittings equivalent length for total system length. Apply a 10% waste/cut allowance — every cut wastes a few inches, and you may need to recut misaligned joints.
System Length =
Dev. Length +
Fittings Equiv. Length
Order Length =
System Length × 1.10
(10% cut allowance)
4 Sticks to Buy
Divide total order length by your stick length (10 or 20 ft) and round up to a whole number. Always buy whole sticks — you cannot buy partial lengths at retail. Store leftover pieces for repairs.
Sticks =
⌈ Order Length ÷
Stick Length ⌉
Example:
48 ft order ÷ 10 ft sticks
= 4.8 → 5 sticks
50 linear ft purchased
Pro Tip — Measure Twice, Cut Once (and Add 10%)
The most common DIY plumbing mistake is under-ordering. Pipe is sold in fixed lengths and hardware stores don't allow returns on cut pipe. Add at least 10% to your total — more (15%) for projects with many bends in tight spaces or complex routing. Always measure the developed length separately for each run rather than estimating room dimensions. A 3/4 in pipe run that travels 2 ft up, 8 ft across a wall, then 3 ft down to a fixture is 13 ft of developed length — not 8 ft. Mark your measurements with tape on a sketch before visiting the store.
Example Calculations — 3 Real-World Scenarios
These worked examples show the calculator across three common U.S. residential plumbing projects.
🟢 Bathroom Supply Rough-In
3/4 in CPVC, sink + toilet + shower
Material: CPVC (hot & cold)
Size: 3/4 in (ID ~0.75 in)
Run 1: 12 ft (main horizontal)
Run 2: 8 ft (vertical drops)
Run 3: 5 ft (branch to shower)
Fittings: 4× 90° elbows, 2× tees
2× ball valves
Dev. Length: 25 ft · Equiv: ~12 ft Order: ~41 ft · Sticks: 5 × 10 ft
CPVC is code-approved for hot & cold supply in most U.S. jurisdictions. 4 elbows + 2 tees + 2 ball valves add roughly 14 ft fitting equivalent. System total × 1.10 = 43 ft → 5 sticks of 10 ft.
🟡 Kitchen Island Drain Line
2 in PVC DWV, island to wall stack
Material: PVC Schedule 40 (DWV)
Size: 2 in (ID ~2.067 in)
Run 1: 14 ft (under floor to wall)
Run 2: 4 ft (vertical up to stack)
Fittings: 2× 90° elbows, 1× tee branch
1× cleanout plug
Dev. Length: 18 ft · Equiv: ~8 ft Order: ~29 ft · Sticks: 3 × 10 ft
DWV pipe must maintain 1/4 in per foot slope toward the drain stack. PVC DWV is not the same as PVC pressure pipe — use the correct schedule for drain applications.
🔴 Whole-House PEX Manifold Run
1/2 in PEX, manifold to 3 fixtures
Material: PEX (flexible supply)
Size: 1/2 in (ID ~0.475 in)
Run 1: 22 ft (master bath)
Run 2: 18 ft (hall bath)
Run 3: 15 ft (kitchen)
Fittings: 6× 90° elbows, 3× tees
Dev. Length: 55 ft · Equiv: ~6 ft Order: ~67 ft · Buy: 1 × 100 ft coil
PEX is sold in 100 ft or 300 ft coils — one 100 ft coil covers this project with room to spare. PEX's flexibility means fewer elbows vs rigid pipe. PEX cannot be used for gas lines.
Common Fitting Equivalent Lengths — Quick Reference
These values use the Le/D ratio method (equivalent length ÷ inside diameter). Multiply Le/D by your pipe inside diameter in feet to get equivalent feet per fitting.
Fitting Type
Le/D Ratio
1/2 in ID
3/4 in ID
1 in ID
Use
90° Elbow (standard) Most Common
30
1.56 ft
2.06 ft
2.62 ft
Direction change
45° Elbow
16
0.83 ft
1.10 ft
1.40 ft
Offset routing
Tee (branch flow)
60
3.13 ft
4.12 ft
5.24 ft
Flow split
Tee (straight run)
20
1.04 ft
1.37 ft
1.75 ft
Straight through tee
Coupling / Union
2
0.10 ft
0.14 ft
0.17 ft
Pipe join
Ball Valve (full open) Low Loss
3
0.16 ft
0.21 ft
0.26 ft
Shutoff
Gate Valve (full open)
8
0.42 ft
0.55 ft
0.70 ft
Main shutoff
Globe Valve (full open) High Loss
340
17.7 ft
23.4 ft
29.8 ft
Flow throttle
Check Valve (swing)
120
6.25 ft
8.25 ft
10.5 ft
Backflow prevent
Reducer / Bushing
10
0.52 ft
0.69 ft
0.87 ft
Size transition
90° Elbow
Le/D ratio30
3/4 in equiv.~2.1 ft
UseDirection change
Tee (branch)
Le/D ratio60
3/4 in equiv.~4.1 ft
UseFlow split
Ball Valve
Le/D ratio3
3/4 in equiv.~0.2 ft
UseShutoff
Globe Valve
Le/D ratio340
3/4 in equiv.~23 ft
UseFlow throttle
Frequently Asked Questions
Developed length is the actual measured physical distance that pipe travels through your structure — every horizontal run, vertical riser, and offset section added together. It's what you measure with a tape measure. Equivalent length converts the friction resistance of fittings (elbows, valves, tees) into an equivalent amount of straight pipe. A 90° elbow on 3/4 inch pipe creates about as much flow resistance as 2 additional feet of straight pipe. For residential planning, you add both together — plus a 10% waste allowance — to determine how much pipe to order.
PVC Schedule 40 is for cold water supply, irrigation, and drain/waste/vent (DWV) lines only — it is not rated for hot water. CPVC handles hot and cold supply lines up to 180°F and is widely accepted by U.S. plumbing codes for residential use. Type L copper (medium wall) is the traditional choice for hot and cold supply, is highly durable, and is soldered with no glue. PEX is flexible, freeze-resistant, and easy to route through finished walls; it requires crimp or expansion fittings and is now accepted by most codes. Always verify approved materials with your local building department before purchase.
The Le/D method expresses a fitting's friction resistance as a multiple of the pipe inside diameter. "Le" is the equivalent length and "D" is the pipe inside diameter — so Le/D = 30 for a 90° elbow means that elbow creates the same pressure drop as 30 pipe diameters worth of straight pipe. To get actual feet, multiply Le/D by the pipe inside diameter in feet. For a 3/4 inch pipe (ID ≈ 0.824 inches = 0.0687 feet): 30 × 0.0687 = 2.06 feet equivalent per elbow. This method is accurate enough for residential planning and material ordering.
A globe valve forces water to make two 90° turns through its body — in through the side, down through the seat, then up and out the other side. This tortuous path creates very high flow resistance, with an Le/D ratio of roughly 340 — meaning a fully open globe valve on a 3/4 inch line is equivalent to about 23 feet of straight pipe. This is why globe valves are used for throttling flow, not shutoff applications. For shutoff, use a ball valve (Le/D ≈ 3) which has nearly no flow restriction when fully open. Specifying the wrong valve type in a tight system can dramatically reduce water pressure at fixtures.
A 10% waste factor is standard for most residential plumbing projects. Add more — up to 15–20% — if your run involves many short cuts (under 1 foot each), tight inside-wall routing, or if this is your first time soldering copper or cementing PVC. Every cut wastes at least 1–2 inches (blade kerf plus squaring). Plan your cuts strategically: run longer sections from a single stick where possible to minimize leftover scrap. Keep leftover pieces — future repairs often need exactly the same pipe size.
