How do you calculate fired dimensional yield?

Divide the parts within tolerance by the total parts measured and multiply by 100. With 472 of 520 fired parts in tolerance, the fired dimensional yield is 90.77%.

What is a good dimensional yield for technical ceramics?

Mature, well-controlled ceramic processes often run above 95% on established geometries, which is why the 95% default target is common. The example's 90.77% sits 4.23 points short, signaling shrinkage or pressing variation worth investigating.

Why do fired ceramics miss dimensional tolerance?

The dominant cause is shrinkage variation from inconsistent green density, binder distribution, or furnace temperature gradients. Because sintering shrinkage is large, a small density gradient across a part can push features out of tolerance.

What does the dimensional yield gap tell me?

It is the percentage-point distance from your target. A positive gap, like the 4.23 points here, means you are below target by that much and should expect proportional scrap cost until the process is recentered.

Yield vs first-pass yield, what is the difference?

This metric counts parts within tolerance as measured, which may follow grinding. First-pass yield counts parts that pass without any rework. If you grind to size after firing, track both so you do not credit grinding with hiding firing variation.

How many parts should I measure for a reliable figure?

Measure enough to make the percentage stable against single-part swings; 520 parts as in the default gives roughly two-tenths of a point per part. Smaller samples bounce more, so treat early-run yields as directional.

Advanced Technical Ceramics calculator

Fired Dimensional Yield Calculator

Fired dimensional yield is the share of sintered ceramic parts that land inside dimensional tolerance after firing shrinkage, and it is one of the truest measures of how well a ceramic process is controlled. Because alumina and zirconia shrink 15-25% during sintering, small variations in green density, binder content, or furnace gradient turn into out-of-tolerance parts that often cannot be reworked. Quality engineers and process owners track this metric to catch drifting shrinkage factors, qualify new pressing tools, and report scrap-driven cost. This calculator returns both the yield and the gap to your target so you can see at a glance whether the process is meeting commitments.

What this calculator does

Calculate dimensional yield for fired ceramic parts from parts within tolerance, total parts measured, and the dimensional yield target.
a quality engineer needs to measure how many fired ceramic parts meet drawing dimensions after sintering or grinding
It computes the percentage of measured fired parts that fall within dimensional tolerance and the percentage-point gap between that yield and your target.

Formula used

Fired dimensional yield = parts within tolerance ÷ total parts measured × 100
Dimensional yield gap = fired dimensional yield - target dimensional yield

Inputs explained

Parts within dimensional tolerance:
Total parts measured:
Target dimensional yield:

How to use the result

Use it after a firing run or during a capability study to quantify how many parts hit dimension and how far you are from the goal.
It is a pass/fail count and says nothing about where in the tolerance band parts sit, so a process drifting toward one limit can still post a high yield right before it fails.

Current U.S. benchmarks

Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate fired dimensional yield? Divide the parts within tolerance by the total parts measured and multiply by 100. With 472 of 520 fired parts in tolerance, the fired dimensional yield is 90.77%.
What is a good dimensional yield for technical ceramics? Mature, well-controlled ceramic processes often run above 95% on established geometries, which is why the 95% default target is common. The example's 90.77% sits 4.23 points short, signaling shrinkage or pressing variation worth investigating.
Why do fired ceramics miss dimensional tolerance? The dominant cause is shrinkage variation from inconsistent green density, binder distribution, or furnace temperature gradients. Because sintering shrinkage is large, a small density gradient across a part can push features out of tolerance.
What does the dimensional yield gap tell me? It is the percentage-point distance from your target. A positive gap, like the 4.23 points here, means you are below target by that much and should expect proportional scrap cost until the process is recentered.
Yield vs first-pass yield, what is the difference? This metric counts parts within tolerance as measured, which may follow grinding. First-pass yield counts parts that pass without any rework. If you grind to size after firing, track both so you do not credit grinding with hiding firing variation.

Last reviewed 2026-05-12.