How do you calculate rod-to-wire yield loss?

Divide the scrap and cobble weight by the total rod charged. With 8 units of scrap against 250 units of rod, loss is 3.2%. Finished-wire yield is the complement, about 96.8%.

What does the gap to target mean here?

It is your target minus the calculated rate. With a 95% reference and a 3.2% loss, the reported gap is 91.8 points — a large spread because the target and a loss figure are on different bases, so read it as distance from your reference line, not a pass/fail.

What is a good rod-to-wire yield?

For clean, well-drawn wire, finished yield above 95-97% (scrap loss of 3-5% or less) is typical. Fine wire with many draws and frequent breaks can see higher loss; heavy single-draw product runs tighter.

Why is my scrap loss higher on some rod lots?

Rod cleanliness drives it. Inclusions, scale and poor surface cause breaks that generate cobbles and tag-end scrap. A dirty lot can double your loss even with identical dies and line speed.

How do I reduce rod-to-wire scrap loss?

Improve rod quality and pickling, tighten die maintenance to prevent breaks, and minimize weld and threading scrap by running longer coils. Cutting the 3.2% loss to 2% on 250 units of rod recovers 3 units of billable wire.

Is rod-to-wire yield the same as line efficiency?

No. Yield is a material metric — how much rod becomes wire. Line efficiency is a time metric — how much runtime was productive. You can have high efficiency and poor yield if the line runs steadily but scraps a lot.

Wire Drawing & Rod Processing calculator

Rod-To-Wire Yield Calculator

Rod-To-Wire Yield tracks how much of the rod you charge into a drawing line survives as finished wire versus what is lost to cobbles, welds, tag ends, scale and out-of-tolerance footage. In this form it reports the loss percentage — scrap against total rod — and the gap between that loss and your target allowance. Metallurgists and cost accountants watch it because every point of yield loss is rod you paid for and cannot ship, and on high-value alloys like copper or specialty steel that loss compounds fast. It is the cleanest single indicator of how well rod cleanliness, die setup and threading discipline are working together.

What this calculator does

Rod-To-Wire Yield tracks how much of the rod you charge into a drawing line survives as finished wire versus what is lost to cobbles, welds, tag ends, scale and out-of-tolerance footage.
Use it when rod-to-wire yield in wire drawing and rod processing needs a clean rate and gap-to-target you can put on a tier board.
Computes scrap loss as a percent of rod charged and the gap between that loss and your target allowance in percentage points.

Formula used

Rod-To-Wire Yield rate = affected amount ÷ total amount
Gap to target = target rate - calculated rate

Inputs explained

Scrap and cobble weight lost:
Rod charged into the line:
Target scrap-loss allowance:

How to use the result

Use it at end of run or shift to grade rod-to-wire conversion against a scrap-loss target and flag lots that ran dirty or break-prone.
It reports loss against a target but does not tell you the cause — a high loss could be a bad rod lot, a worn die, or a threading error, so pair it with break logs.

Current U.S. benchmarks

The producer price index for copper and brass mill shapes stands at 559.593 (BLS, May 2026), up 76.8% from a year earlier. Quotes priced off last quarter's material cost miss this move. Global copper trades at $13,484 per tonne (IMF via FRED, May 2026).
The U.S. has 5,397 electrical equipment and appliances establishments employing about 369,437 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate rod-to-wire yield loss? Divide the scrap and cobble weight by the total rod charged. With 8 units of scrap against 250 units of rod, loss is 3.2%. Finished-wire yield is the complement, about 96.8%.
What does the gap to target mean here? It is your target minus the calculated rate. With a 95% reference and a 3.2% loss, the reported gap is 91.8 points — a large spread because the target and a loss figure are on different bases, so read it as distance from your reference line, not a pass/fail.
What is a good rod-to-wire yield? For clean, well-drawn wire, finished yield above 95-97% (scrap loss of 3-5% or less) is typical. Fine wire with many draws and frequent breaks can see higher loss; heavy single-draw product runs tighter.
Why is my scrap loss higher on some rod lots? Rod cleanliness drives it. Inclusions, scale and poor surface cause breaks that generate cobbles and tag-end scrap. A dirty lot can double your loss even with identical dies and line speed.
How do I reduce rod-to-wire scrap loss? Improve rod quality and pickling, tighten die maintenance to prevent breaks, and minimize weld and threading scrap by running longer coils. Cutting the 3.2% loss to 2% on 250 units of rod recovers 3 units of billable wire.

Last reviewed 2026-05-12.