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Data Classification Volume Calculator

Work out data classification volume instantly with clear inputs, formula shown and shareable results.

About Data Classification Volume Calculator

Classification exists to scope controls. Encryption at rest, DLP inspection, retention enforcement and access review all cost per terabyte, so knowing that a quarter of the estate is confidential or above turns an unbounded programme into a sized one. The public share matters equally, because data that needs no protection should be excluded from expensive controls entirely.

Formula

Classification volumes

public share = 1 - restricted - confidential - internal; encryption scope = total x (restricted + confidential)

Worked example

With the default values below, Data Classification Volume Calculator returns Data requiring encryption and access control of 113.50 TiB. Change any input above and every figure here is recalculated in your browser.

Inputs used

Total data volumeminimum 0.01 TB
480 TB
Restricted / secret shareaccepts 0–100 %
4 %
Confidential shareaccepts 0–100 %
22 %
Internal shareaccepts 0–100 %
45 %

Results

Data requiring encryption and access control
113.50 TiB
Restricted-tier data
17.46 TiB
Share classified as public
29.0%
Share at confidential or above
26.0%

Step by step

  1. 1Values used
  2. 2Classification volumes
  3. 3Data requiring encryption and access control= 124,800,000,000,000
  4. 4Restricted-tier data= 19,200,000,000,000
  5. 5Share classified as public= 29.0
  6. 6Share at confidential or above= 26.0

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 1 decimal place, 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

Why not just encrypt everything?

Encryption at rest is cheap enough that many organisations do, but key management, DLP inspection and access review are not. Those are the controls classification actually scopes.

What if the shares do not sum to 100 percent?

The remainder is treated as public. In practice a large unclassified remainder is the real finding, since unclassified data receives whatever protection its storage location happens to provide.

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