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Free AQL Sampling Plan Calculator (ANSI/ASQ Z1.4)

Generate single-sampling normal inspection plans per ANSI/ASQ Z1.4 (ISO 2859-1). Enter lot size, inspection level (General I / II / III), and AQL value — get the code letter, sample size, and accept/reject numbers instantly. No login, no account.

HOW IT WORKS

  1. Enter your lot size — the total number of items in the production batch.
  2. Choose inspection level — General II is the standard default for most applications.
  3. Select your AQL value — the maximum acceptable quality level (%, per ANSI/ASQ Z1.4).
  4. Read the sampling plan — code letter, sample size n, accept number Ac, and reject number Re update instantly. Export CSV to save the plan.
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AQL Sampling Plan Calculator
ANSI/ASQ Z1.4 (ISO 2859-1) single-sampling normal inspection plans. All table data is hardcoded — no server calls.
Lot Size
Inspection Level
AQL Value (%)
Sampling Plan
Code Letter
J
Sample Size (n)
80
Accept (Ac)
≤ 5
Reject (Re)
≥ 6
Inspect 80 units; accept the lot if ≤5 defects, reject if ≥6.

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