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Least Privilege Score Calculator

Work out least privilege score instantly with clear inputs, formula shown and shareable results.

About Least Privilege Score Calculator

The clearest measure of least privilege is the gap between permissions granted and permissions exercised, since anything unused for a full review period is a candidate for removal. Cloud access analysers report usage ratios in the low tens of percent as typical. Administrative role share is the second axis, because a small number of over-privileged accounts dominates blast radius.

Formula

Least-privilege score

usage ratio = used / granted; score = 0.7 x usage ratio + 0.3 x (100 - 10 x admin share), clamped to 0-100

Worked example

With the default values below, Least Privilege Score Calculator returns Least-privilege score (0-100) of 34.3. Change any input above and every figure here is recalculated in your browser.

Inputs used

Permissions grantedminimum 1
4,200
Permissions actually used in the periodminimum 0
980
Accounts with administrative rolesminimum 0
120
Total accountsminimum 1
3,000

Results

Least-privilege score (0-100)
34.3
Granted permissions actually used
23.3%
Unused permissions that could be removed
3,220
Accounts holding administrative roles
4.00%

Step by step

  1. 1Values used
  2. 2Least-privilege score
  3. 3Least-privilege score (0-100)= 34.3
  4. 4Granted permissions actually used= 23.3
  5. 5Unused permissions that could be removed= 3,220
  6. 6Accounts holding administrative roles= 4.00

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How long should the observation window be?

At least 90 days, and longer where quarterly or annual processes exist. Revoking a permission used only at financial year end will break something twelve months later.

Should unused permissions be removed automatically?

Stage it. Alert, then move to a deny-with-override, then remove. Immediate automated revocation of anything unused causes outages and destroys trust in the programme.

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