Total Addressable Market (TAM)
01 Definition
Total Addressable Market (TAM) meaning: The total revenue possible if a product captured its entire relevant market.
Total addressable market is the full revenue opportunity for a product or service if every possible customer bought it. It sets the outer boundary for market sizing and is usually narrowed into SAM and SOM. TAM is an estimate, so it depends heavily on the assumptions behind it.
Also called
Why it matters
How Total Addressable Market (TAM) fits the work
TAM helps founders and investors gauge whether an opportunity is large enough to pursue, framing the ceiling before more realistic estimates are calculated.
In context
A billing tool estimated its TAM by multiplying every small business worldwide that could use it by the average annual price it would charge.
Practical note
TAM is often inflated. Check how it was built, whether top down from broad reports or bottom up from real units and prices, because bottom up is usually more defensible.