How do you calculate tube scrap rate?

Divide the number of scrapped tubes by the total tubes produced. With 8 scrapped out of 250 produced, the scrap rate is 3.2%.

What is a good scrap rate for tube forming?

Mature tube-bending cells often run 1-3% scrap; under 1% is excellent, while consistently above 5% points to tooling wear, material variation or an unstable setup that needs attention.

What is the difference between scrap rate and first-pass yield?

Scrap rate is the fraction rejected; first-pass yield is the fraction that passes clean the first time. If scrap is 3.2% and there is no rework, first-pass yield is roughly 96.8%.

What does the gap to target mean here?

It is the distance between your scrap rate and the target reference you entered. In the default, the 3.2% rate against a 95 reference yields a gap figure of 91.8, showing how the calculator subtracts the computed rate from the reference.

How do I reduce tube scrap rate?

Attack the top defect mode first - usually over-ovality or wall splits at the bend. Tighten mandrel positioning, check wiper die clearance, verify material lot certs, and add first-article and in-process checks so drift is caught before a whole run is lost.

Should reworkable tubes count as scrap?

No - count only tubes that are genuinely unrecoverable as scrap. Track reworked tubes separately, because lumping them in overstates scrap and hides the true first-pass quality of the cell.

Tube, Pipe & Profile Forming calculator

Tube Scrap Rate Calculator

Tube Scrap Rate is the share of a tube-forming run that ends up rejected - split seams, over-oval bends, wrinkles, wall failures - expressed as a percentage of everything produced. It is the single most watched number on a tube shop floor because every scrapped tube carries material, bend time, mandrel wear and often downstream end-forming that is now wasted. Production supervisors and continuous-improvement teams track it per run and per shift to catch tooling drift and setup errors early. This calculator also shows the gap between your scrap rate and a target reference so you can see how far a cell is from its yield goal.

What this calculator does

Tube Scrap Rate is the share of a tube-forming run that ends up rejected - split seams, over-oval bends, wrinkles, wall failures - expressed as a percentage of everything produced.
Use it when tube scrap rate in tube, pipe and profile forming needs a clean rate and gap-to-target you can put on a tier board.
It divides scrapped tubes by total tubes produced to give a scrap percentage, then shows the distance between that rate and your target reference.

Formula used

Tube Scrap Rate rate = affected amount ÷ total amount
Gap to target = target rate - calculated rate

Inputs explained

Tubes scrapped in the run:
Total tubes produced in the run:
Target first-pass yield reference:

How to use the result

Use it at end of run, shift or lot to quantify loss and to gauge how a cell is tracking against its yield or scrap target.
A single scrap rate hides the mix of defect causes - a 3% rate from one bad setup is very different from 3% spread across many modes - so pair it with a Pareto of defect reasons before acting.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.

Common questions

How do you calculate tube scrap rate? Divide the number of scrapped tubes by the total tubes produced. With 8 scrapped out of 250 produced, the scrap rate is 3.2%.
What is a good scrap rate for tube forming? Mature tube-bending cells often run 1-3% scrap; under 1% is excellent, while consistently above 5% points to tooling wear, material variation or an unstable setup that needs attention.
What is the difference between scrap rate and first-pass yield? Scrap rate is the fraction rejected; first-pass yield is the fraction that passes clean the first time. If scrap is 3.2% and there is no rework, first-pass yield is roughly 96.8%.
What does the gap to target mean here? It is the distance between your scrap rate and the target reference you entered. In the default, the 3.2% rate against a 95 reference yields a gap figure of 91.8, showing how the calculator subtracts the computed rate from the reference.
How do I reduce tube scrap rate? Attack the top defect mode first - usually over-ovality or wall splits at the bend. Tighten mandrel positioning, check wiper die clearance, verify material lot certs, and add first-article and in-process checks so drift is caught before a whole run is lost.

Last reviewed 2026-05-12.