How do you calculate parts cleanliness compliance rate?

Divide passing samples by total samples tested and multiply by 100. With 238 of 250 samples passing, the compliance rate is 95.2%.

What does the compliance gap to target mean?

It is your actual rate minus the target. Here 95.2% against a 98% target gives a gap of -2.8 points, meaning you are 2.8 percentage points short and have a conformance problem to close.

What is a good cleanliness compliance rate?

Most cleanliness specs target 98-100% pass on sampled parts; safety-critical hydraulic and medical parts run 99%+ or zero-defect. The 95.2% here is below a 98% target, so it is not yet acceptable.

How many cleanliness samples should I test?

Enough that the rate is statistically meaningful for your lot size and standard; 250 samples gives reasonable resolution, where each failure moves the rate by 0.4 points. Small samples make a single fail swing the rate too much to trust.

Why is my compliance rate below target even though most parts pass?

At 250 samples, 12 failures already drops you to 95.2%, 2.8 points under a 98% target. High-volume cleanliness work needs very low failure counts because each reject costs roughly 0.4 points against the target.

Cleanliness compliance rate vs first-pass yield, what is the difference?

First-pass yield measures parts that pass cleanliness without a re-wash on the line; compliance rate measures sampled parts meeting spec at audit. A part can be re-washed (hurting yield) yet pass final inspection (helping compliance).

Industrial Cleaning, Washing & Parts Cleanliness calculator

Parts Cleanliness Compliance Calculator

Parts cleanliness compliance rate is the percentage of inspected parts that meet the cleanliness specification, measured against samples tested by gravimetric, particle-count or extraction methods. Quality engineers and cleanliness lab technicians in automotive, hydraulic and medical supply chains use it to prove conformance to standards like ISO 16232 or VDA 19. It matters because a single missed cleanliness limit can field a warranty claim or shut down a customer's line, and a compliance rate trending toward target is the early warning. This calculator turns raw pass/fail counts into a rate and tells you how far you are from the bar.

What this calculator does

Calculate cleanliness compliance rate from passing samples, total tested samples, and target pass rate.
Use it when quality teams need to track whether washed parts meet particle, residue, or customer cleanliness specifications.
It computes the cleanliness compliance rate as passing samples divided by total samples tested, then reports the gap in percentage points to your target pass rate.

Formula used

Parts cleanliness compliance rate = cleanliness samples passing specification ÷ total cleanliness samples tested × 100
Parts cleanliness compliance gap to target = parts cleanliness compliance rate - target cleanliness pass rate

Inputs explained

Cleanliness samples passing specification:
Total cleanliness samples tested:
Target cleanliness pass rate:

How to use the result

Use it for periodic cleanliness reporting, PPAP and audit evidence, or to track whether a washer or chemistry change moved conformance.
It treats every sample equally and as pass/fail; it does not weight by severity of the cleanliness miss or by particle size distribution, which two parts at the same pass rate can differ on sharply.

Current U.S. benchmarks

U.S. manufacturing runs at 75.6% of capacity (Federal Reserve, May 2026). New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate parts cleanliness compliance rate? Divide passing samples by total samples tested and multiply by 100. With 238 of 250 samples passing, the compliance rate is 95.2%.
What does the compliance gap to target mean? It is your actual rate minus the target. Here 95.2% against a 98% target gives a gap of -2.8 points, meaning you are 2.8 percentage points short and have a conformance problem to close.
What is a good cleanliness compliance rate? Most cleanliness specs target 98-100% pass on sampled parts; safety-critical hydraulic and medical parts run 99%+ or zero-defect. The 95.2% here is below a 98% target, so it is not yet acceptable.
How many cleanliness samples should I test? Enough that the rate is statistically meaningful for your lot size and standard; 250 samples gives reasonable resolution, where each failure moves the rate by 0.4 points. Small samples make a single fail swing the rate too much to trust.
Why is my compliance rate below target even though most parts pass? At 250 samples, 12 failures already drops you to 95.2%, 2.8 points under a 98% target. High-volume cleanliness work needs very low failure counts because each reject costs roughly 0.4 points against the target.

Last reviewed 2026-05-12.