How do you calculate bar stock yield?

Divide usable bar length by purchased bar length and multiply by 100. With 232 in usable out of 250 in purchased, yield is 232 / 250 x 100 = 92.8%.

What is a good bar stock yield?

Most bar-fed shops target 90-95% length yield. The 92.8% example beats a 92% target by about 0.8 points, which is a healthy result.

What causes bar stock yield loss?

The unusable remnant left in the spindle liner, facing and parting allowances, and any crop for straightness or end defects all shorten usable length below purchased length.

How do I reduce remnant waste?

Choose a stock length that divides cleanly into part length plus parting kerf, use a shorter spindle liner where possible, and consolidate remnants by running the same diameter back-to-back.

Is longer bar stock always better for yield?

Often yes, because the fixed remnant is amortized over more parts, but only if the longer bar still fits your bar feeder and stays straight. Beyond that, handling and straightness losses can offset the gain.

Does bar stock yield include parting kerf?

No. This is a length ratio of usable to purchased bar. Parting kerf between parts is a separate loss you should subtract when converting usable length into a part count.

Metals, Steel, Aluminum & Coil Processing calculator

Bar Stock Yield Calculator

Bar stock yield measures how much of a purchased bar length you can actually turn into parts after subtracting the remnant end, the spindle-liner allowance, facing stock, and any unusable crop. Screw-machine and CNC bar-fed shops watch it because remnant length is pure paid-for metal that goes to the scrap bin, and on high-volume jobs those inches add up to real money per bar. It directly drives material cost per part and how aggressively you can quote. Trending yield against a target flags when stock length, part nesting, or pull-feed settings are leaving too much on the floor.

What this calculator does

Estimate bar stock yield by dividing usable bar length by the purchased bar length, then see how far the yield sits from your target after cutoff and remnant loss.
Use it when an estimator or planner needs to know how much purchased bar stock becomes usable parts after saw cutoff and remnants.
It computes usable bar length as a percentage of purchased length, plus the point gap to your target yield.

Formula used

Bar stock yield = usable bar length ÷ purchased bar length × 100
Gap to target yield = bar stock yield - target yield

Inputs explained

Usable bar length after crop:
Purchased bar length:
Target bar stock yield:

How to use the result

Use it when costing a bar-fed turning job or choosing a stock length that minimizes remnant waste.
It treats yield as a length ratio only; it does not account for kerf between parts or scrap from machining defects, which reduce usable parts further.

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.
The producer price index for aluminum mill shapes stands at 404.859 (BLS, May 2026), up 36.8% from a year earlier. Quotes priced off last quarter's material cost miss this move.
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).

Common questions

How do you calculate bar stock yield? Divide usable bar length by purchased bar length and multiply by 100. With 232 in usable out of 250 in purchased, yield is 232 / 250 x 100 = 92.8%.
What is a good bar stock yield? Most bar-fed shops target 90-95% length yield. The 92.8% example beats a 92% target by about 0.8 points, which is a healthy result.
What causes bar stock yield loss? The unusable remnant left in the spindle liner, facing and parting allowances, and any crop for straightness or end defects all shorten usable length below purchased length.
How do I reduce remnant waste? Choose a stock length that divides cleanly into part length plus parting kerf, use a shorter spindle liner where possible, and consolidate remnants by running the same diameter back-to-back.
Is longer bar stock always better for yield? Often yes, because the fixed remnant is amortized over more parts, but only if the longer bar still fits your bar feeder and stays straight. Beyond that, handling and straightness losses can offset the gain.

Last reviewed 2026-05-12.