Free market-sizing tool

TAM, SAM and SOM Calculator

Estimate total addressable market, the portion your offer can actually serve, and the share you can realistically obtain.

Simple market sizing

Build TAM, SAM and SOM from the bottom up

Annual market value

Total addressable market

Total potential customers / accounts

customers

Average annual spend per customer

$/ year

Serviceable market

Serviceable share of total market

Share you can serve based on product, geography, channel, regulation or customer fit. Realistically obtainable share of SAM

Practical share you believe can be won within your planning period.

Planning context

Current annual revenue

Target years to reach SOM

years

Expected annual market growth

Simple methodTAM = total potential customers × annual spend. SAM = TAM × serviceable share. SOM = SAM × realistically obtainable share. The growth field projects the entire market forward to the target year; the current-year TAM, SAM and SOM remain based on today’s inputs.

Advanced market sizing

Build a segmented bottom-up market model

4 market segments

Market segments

SegmentPotential accountsAnnual spend / accountServiceableObtainable of SAM

Execution constraints

Annual revenue delivery capacity

Set to 0 for no capacity ceiling. Annual capacity growth

Annual market growth

Projection horizon

years

Optional benchmark

External / top-down TAM benchmark

Optional outside estimate for comparing against the bottom-up TAM. Current annual revenue

Advanced methodEach segment calculates TAM = accounts × annual spend, SAM = TAM × serviceable %, and theoretical SOM = SAM × obtainable %. The segment totals are added together. Realistic SOM is then capped by annual revenue delivery capacity when a capacity ceiling is entered. Multi-year projections grow both the market and the revenue-capacity ceiling independently.

Segment breakdown

Market size by customer segment

Bottom-up market model

Segment	Potential accounts	Annual spend / account	TAM	Serviceable %	SAM	Obtainable %	Theoretical SOM

Market-growth projection

TAM, SAM and SOM over time

Capacity grows separately from market

Year	Projected TAM	Projected SAM	Theoretical SOM	Revenue capacity	Realistic SOM

Serviceable-market sensitivity

Market opportunity as serviceable share changes

All segment serviceable shares scaled together

Serviceable-share scale	SAM	Theoretical SOM	Realistic SOM	SAM / TAM

Obtainable-share sensitivity

Realistic SOM as obtainable share changes

All segment obtainable shares scaled together

Obtainable-share scale	Theoretical SOM	Revenue capacity	Realistic SOM	Capacity constrained?

Spend sensitivity

Market size as annual customer spend changes

All segment spend assumptions scaled together

Spend scale	TAM	SAM	Theoretical SOM	Realistic SOM

Scope

Market size depends on the assumptions underneath it

This calculator is a planning model, not a market-research report. TAM can be overstated when customer counts are too broad or annual spend includes budgets that are not actually contestable. SAM should reflect real product, geographic, regulatory and channel constraints. SOM should be grounded in sales capacity, competition, switching friction, pricing and the time period in which you expect to win customers.