Calculate audit man days, number of auditors, or days per auditor from any two values using auditors × days per auditor to solve the missing value.
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Audit Man Days Formula
The calculator uses the relationship between total audit effort, the number of auditors assigned, and the number of days each auditor works.
- Total Man Days is the total audit effort required.
- Number of Auditors is how many auditors are assigned to the audit.
- Days per Auditor is the number of audit days worked by each auditor.
To calculate total man days, multiply the number of auditors by the days worked by each auditor.
Use this version when you know the total man days required and how many days each auditor will work.
Use this version when you know the total man days required and how many auditors are assigned.
Common Audit Staffing Scenarios
These examples show how total audit effort changes as the number of auditors or assigned days change.
| Number of Auditors | Days per Auditor | Total Man Days |
|---|---|---|
| 1 | 5 | 5 |
| 2 | 3 | 6 |
| 3 | 4 | 12 |
| 4 | 2.5 | 10 |
| Result Type | What It Tells You | Planning Note |
|---|---|---|
| Total Man Days | Total audit effort needed | Useful for budgeting and audit scheduling |
| Number of Auditors | How many auditors are needed | Round up if the result is not a whole person |
| Days per Auditor | How long each auditor must work | May include partial days depending on your audit plan |
Example Calculations
Example 1: Calculate total man days
You have 3 auditors, and each auditor will work 4 days.
The audit requires 12 total man days.
Example 2: Calculate days per auditor
An audit requires 15 total man days, and 5 auditors are assigned.
Each auditor needs to work 3 days.
FAQ
What is an audit man day?
An audit man day is one day of audit work performed by one auditor. For example, 2 auditors working for 3 days equals 6 man days.
Can the number of auditors be a decimal?
The formula can return a decimal, but in real staffing you usually need a whole number of auditors. If the result is 2.5 auditors, you would normally plan for 3 auditors or adjust the number of days.
Does this include preparation and reporting time?
Only include preparation, travel, reporting, or follow-up time if you want those activities counted in the total man days. The calculator only applies the numbers you enter, so the scope of the time depends on your audit plan.