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Chargeback Calculator

Allocate 100% of a cloud bill onto consuming teams, spreading shared platform and untagged cost by even, proportional or weighted keys.

About Chargeback Calculator

Chargeback moves the whole invoice onto consuming teams, which means the shared platform layer and any untagged cost must be pushed somewhere rather than absorbed centrally. The allocation key decides who pays: an even split is simple but punishes small teams, proportional tracks usage and is the common default, and a weighted key lets you encode a business judgement such as revenue or headcount. The moment cloud cost lands in a team's own budget, behaviour changes — but so does the argument, because the shared-cost key is where every dispute happens. Publishing the key and driving the unallocated residual to zero is what makes chargeback defensible; this is a modelling aid, not accounting or tax advice.

Formula

Chargeback

team charge = direct cost + (shared pool + untagged cost) × allocation share, where the share is 1 ÷ teams, direct cost ÷ total direct cost, or the team weight ÷ total weight.

shared pool
Platform and untagged cost that no single team consumed directly
allocation share
Fraction of the shared pool a team absorbs under the chosen key
residual
Any part of the invoice left unallocated — chargeback must drive this to zero

Worked example

With the default values below, Chargeback Calculator returns Team A Fully Loaded Charge of $90,769.23. Change any input above and every figure here is recalculated in your browser.

Inputs used

Team A direct costaccepts 0–20,000,000 USD/month
60,000 USD/month
Team B direct costaccepts 0–20,000,000 USD/month
35,000 USD/month
Team C direct costaccepts 0–20,000,000 USD/month
22,000 USD/month
Shared platform costaccepts 0–20,000,000 USD/month
48,000 USD/month
Untagged cost that must still be recoveredaccepts 0–20,000,000 USD/month
12,000 USD/month
Shared-cost allocation keyone of Even split across teams, Proportional to direct usage, Weighted key you define
Proportional to direct usage
Team A weightaccepts 0–1,000 weight
3 weight
Team B weightaccepts 0–1,000 weight
2 weight
Team C weightaccepts 0–1,000 weight
1 weight

Results

Team A Fully Loaded Charge
$90,769.23
Team B Fully Loaded Charge
$52,948.72
Team C Fully Loaded Charge
$33,282.05
Total Charged to Teams
$177,000.00
Shared Cost Landing on Team A
$30,769.23
Team A Uplift over Direct Cost
51.3%
Share of the Invoice Allocated
100.0%
Cost Left Unallocated
$0.00

Step by step

  1. 1Values used
  2. 2Chargeback
  3. 3Team A Fully Loaded Charge= 90,769.23
  4. 4Team B Fully Loaded Charge= 52,948.72
  5. 5Team C Fully Loaded Charge= 33,282.05
  6. 6Total Charged to Teams= 177,000.00
  7. 7Shared Cost Landing on Team A= 30,769.23
  8. 8Team A Uplift over Direct Cost= 51.3

Assumptions and limits

  • The result is derived only from the 9 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax 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 Chargeback calculated?

team charge = direct cost + (shared pool + untagged cost) × allocation share, where the share is 1 ÷ teams, direct cost ÷ total direct cost, or the team weight ÷ total weight. Chargeback moves the whole invoice onto consuming teams, which means the shared platform layer and any untagged cost must be pushed somewhere rather than absorbed centrally. The allocation key decides who pays: an even split is simple but punishes small teams, proportional tracks usage and is the common default, and a weighted key lets you encode a business judgement such as revenue or headcount.

Why does Chargeback matter?

The moment cloud cost lands in a team's own budget, behaviour changes — but so does the argument, because the shared-cost key is where every dispute happens. Publishing the key and driving the unallocated residual to zero is what makes chargeback defensible; this is a modelling aid, not accounting or tax advice.

What values do I need to enter?

This calculator takes 9 inputs: Team A direct cost, Team B direct cost, Team C direct cost, Shared platform cost, Untagged cost that must still be recovered, Shared-cost allocation key, Team A weight, Team B weight, Team C weight. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

How is chargeback different from showback?

Chargeback transfers real budget: 100% of the invoice lands in consuming teams' cost centres and they answer for it. Showback reports the same numbers without moving any money, so the central platform team still holds the invoice. Showback is the usual first step because it exposes the allocation disputes before money is at stake.

Related Calculators

Chargeback Calculator – Calculate Team A Fully Loaded Charge