TAM SAM SOM Calculator

Size your market top-down (TAM x Serviceable % x Obtainable %), bottom-up (customers x reach x win rate x revenue), or both side by side.

Fill in a top-down chain, a bottom-up chain, or both. The diagram prefers the top-down chain when present, falling back to bottom-up only when top-down is empty. Filling both shows a side-by-side SOM comparison and a SOM ratio.

$
%
%
SOM (Serviceable Obtainable Market)
$6,250,000
SAM (Serviceable Addressable Market)
$125,000,000
TAM (Total Addressable Market)
$500,000,000
SOM ratio (larger / smaller)
N/A (fill both to compare)

The diagram uses the top-down chain when present, falling back to bottom-up only when top-down is empty.

TAM $500.0MSAM $125.0MSOM $6.3M

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Frequently asked questions

What if my top-down and bottom-up SOM disagree?

A large SOM ratio between the two methods signals the assumptions disagree. Revisit the weaker-sourced inputs on whichever chain is further from your other market data.

Which chain does the diagram show?

The diagram prefers the top-down chain when present. It only falls back to the bottom-up chain when top-down is left empty.

Do I need an account?

No. On-screen results are free. Enter an email only if you want to download the report.

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TAM SAM SOM Calculator