FREE TOOL

Free Gage R&R Calculator (MSA — Average & Range Method)

Compute repeatability (EV), reproducibility (AV), Gage R&R, Part Variation, Total Variation, %GRR, and ndc using the AIAG Average & Range method. Enter measurements for up to 10 parts × 3 operators × 3 trials — all in your browser, no account required.

HOW IT WORKS

Set dimensions — select the number of parts (2–10), operators (2–3), and trials per operator (2–3). The grid resizes instantly.
Enter measurements — type your measured values into the grid, or start from the pre-filled example data and overwrite cells as needed.
Read results — EV (repeatability), AV (reproducibility), Gage R&R, Part Variation, and Total Variation update in real time.
Interpret %GRR — green (<10%) is acceptable, amber (10–30%) is marginal, red (>30%) requires corrective action per AIAG MSA. ndc ≥ 5 is required.

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Gage R&R Calculator

AIAG Average & Range method — compute EV, AV, Gage R&R, PV, TV, %GRR, and ndc.

Parts

Operators

Trials

Part	Op 1		Op 2		Op 3
	T 1	T 2	T 1	T 2	T 1	T 2
1
2
3
4
5
6
7
8
9
10

Gage R&R

8.0%

Acceptable — measurement system is capable

ndc ≥ 5 indicates an adequate measurement system. ndc < 2 means the gage cannot distinguish parts.

Results — Average & Range Method (AIAG)

EV — Repeatability

0.4560

%TV: 7.0%

AV — Reproducibility

0.2500

%TV: 3.8%

Gage R&R

0.5200

%TV: 8.0%

Part Variation (PV)

6.4800

%TV: 99.7%

Total Variation (TV)

6.5008

%TV: —

ndc

17

≥ 5 — adequate

R̄ (avg range)0.1000

X̄diff0.1000

Rp4.0000

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