AS9100 Audit Days Calculator: Estimate Audit Duration and Cost
Certification bodies set AS9100 audit time from the number of effective personnel, the number of sites and the complexity of your product and processes. This calculator reproduces that logic so you can budget before asking for quotes and spot a quote that looks too low or too high.
Your numbers
Base days for effective personnel, in the style of the IAF MD5 table used by certification bodies.
Count each physical location that performs activities in the scope.
Design responsibility, special processes, many product lines or large customer base push audit time up.
Combined audits usually reduce total time a little.
Your results
Planning estimate only. The certification body sets audit time using IAF MD5 and its AS9104/1 rules, and your quote is the binding number. Base days here are approximations of the published table.
Initial audit days vs. complexity factor
Sweeps Complexity factor from 0.7 to 1.6, holding your other inputs fixed.
Audit evidence on demand
See how a private AI layer can pull audit evidence from your ERP and quality records. Optional.
Optional. The tool and every export work without this. No spam.
How to use the calculator
Pick the headcount band that matches your effective personnel, which includes full time staff, part time staff scaled to full time equivalents and long-term contractors working within the scope. Enter the number of sites, the complexity level and, if you combine with ISO 9001, set integrated to yes. Add the day rate and travel from the quotes you already have. The tool outputs initial, surveillance and recertification days and a three-year cost. Use the what-if chart to see how much a higher complexity factor adds to the audit.
- Count effective personnel, not just payroll headcount
- Include temporary sites that do in-scope work
- Use real quotes for the day rate and travel
The method behind the numbers
The starting point is a headcount table, in the style of IAF MD5 for quality management systems, which gives base audit days for each band. Certification bodies then adjust up or down for complexity, such as design responsibility, number of special processes and customer-specific requirements, and add time for extra sites. For aerospace, AS9104/1 sets the rules a body must follow, and many bodies apply a minimum audit time and require additional time for Stage 1. Surveillance audits are typically about one third of initial time, and recertification about two thirds. This tool applies a square root site factor as a transparent approximation.
Reading the result
If your quote is below the estimate by a wide margin, ask how the body derived the time, since AS9104/1 limits how far a body may reduce it. If it is far above, check whether the complexity or scope was overstated. The cost output covers one initial audit, two surveillance audits and one recertification audit, with travel counted four times. It excludes internal costs such as staff time, remediation and customer-mandated Nadcap audits, which can easily exceed certification fees.
Common mistakes
Many shops forget that headcount includes shift workers across all sites, understate complexity when they hold design authority, or assume surveillance audits are cheap and then hit a special audit after a major nonconformance. Remember also that scope reductions, such as removing a site, change the table row and must be agreed with the certification body.
- Counting only day shift people
- Forgetting remote or satellite sites
- Ignoring extra time for transfers between certification bodies
Frequently Asked Questions
How many audit days does AS9100 certification take?
It depends on effective personnel, sites and complexity. A shop of around 50 people with one site typically starts near six audit days across Stage 1 and Stage 2 before adjustments. Larger or more complex organisations need more, and multi-site operations add time.
Are surveillance audits shorter than the initial audit?
Yes. Surveillance audits are usually planned at about one third of initial audit time per year, and recertification at about two thirds. Your certification body may adjust these based on performance, complaints or significant changes.
Is this the official AS9104-1 table?
No. AS9104/1 defines the requirements for certification bodies, and audit time follows IAF MD5 style tables plus adjustments. This calculator gives a planning approximation and does not replace the quote or audit plan from your registrar.
Does combining AS9100 with ISO 9001 save time?
Because AS9100 includes the ISO 9001 requirements, a combined audit avoids duplicate work and may reduce time slightly. The reduction is limited by the extra aerospace requirements, so do not expect a large cut.
If your audit evidence sits across ERP, MES and document shares, Netray can add a private AI layer that answers auditor questions from your own systems without sending data outside your network.
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