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Zero Trust Segment Count Calculator

Work out zero trust segment count instantly with clear inputs, formula shown and shareable results.

About Zero Trust Segment Count Calculator

Micro-segmentation multiplies out quickly: applications times environments times tiers gives the segment count, and 140 applications with three environments and three tiers is already 1,260 segments. The contrast between the tier-to-tier policy count and the full-mesh figure is the whole argument for identity-based policy — enumerating pairwise rules does not scale.

Formula

Segmentation scale

segments = applications x environments x tiers; tiered policies = applications x environments x (tiers - 1) x policies per pair; full mesh = segments x (segments - 1) x policies per pair

Worked example

With the default values below, Zero Trust Segment Count Calculator returns Micro-segments required of 1,260. Change any input above and every figure here is recalculated in your browser.

Inputs used

Applications to segmentminimum 1
140
Environments per applicationaccepts 1–10
3
Tiers per applicationaccepts 1–10
3
Policies per communicating pairminimum 1
2

Results

Micro-segments required
1,260
Policies for tier-to-tier flows
1,680
Segments per application
9
Policies if every segment could reach every other
3,172,680

Step by step

  1. 1Values used
  2. 2Segmentation scale
  3. 3Micro-segments required= 1,260
  4. 4Policies for tier-to-tier flows= 1,680
  5. 5Segments per application= 9
  6. 6Policies if every segment could reach every other= 3,172,680

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, fees or charges or compounding frequency into account.
  • Figures are rounded for display to whole numbers, 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 is the policy count kept manageable?

Label-based or identity-based policy. Expressing rules as frontend may talk to backend within the same application and environment collapses thousands of pairwise rules into a handful.

Where should segmentation start?

With environment separation — keeping production away from development and corporate — then crown-jewel applications. Attempting full micro-segmentation first is how these programmes stall.

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