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Infrastructure Drift Count Calculator

Work out infrastructure drift count instantly with clear inputs, formula shown and shareable results.

About Infrastructure Drift Count Calculator

Drift is the gap between declared and actual infrastructure, and it accumulates at the rate of manual change multiplied by the reconciliation interval. Once a meaningful share of resources has drifted, the IaC repository stops being a reliable description of production, which means disaster recovery from code no longer works — the real cost of drift.

Formula

Drift accumulation

drift rate = drifted / managed; drift per cycle = manual changes per week x interval in weeks

Worked example

With the default values below, Infrastructure Drift Count Calculator returns Share of resources drifted of 4.00%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Resources under IaC managementminimum 1
2,400
Resources showing driftminimum 0
96
Manual changes per weekminimum 0
12
Reconciliation intervalminimum 0.1 days
7 days

Results

Share of resources drifted
4.00%
Drift accumulated between reconciliations
12.0
Manual changes per year
624
Assessment
Moderate drift - investigate the sources of manual change

Step by step

  1. 1Values used
  2. 2Drift accumulation
  3. 3Share of resources drifted= 4.00
  4. 4Drift accumulated between reconciliations= 12.0
  5. 5Manual changes per year= 624
  6. 6Assessment= Moderate drift - investigate the sources of manual change

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 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 is drift eliminated?

Remove human write access to production and require all changes through the pipeline. Detection without prevention just produces a recurring report nobody acts on.

Should drift be auto-corrected?

Continuous reconciliation is ideal for stateless resources. Be careful with anything holding data, where reverting a manual change could destroy it.

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