TAM / SAM / SOM Calculator
Every pitch deck has a market-size slide; few survive the question "how did you get that number?" This runs both methods — top-down filters and bottom-up unit math — and flags when they disagree. Nothing leaves your browser.
Why run both
Top-down (universe × price × share) produces the big number; bottom-up (deals your team can actually win, compounded with retention) produces the honest one. When bottom-up steady-state revenue lands far below the top-down SOM, the SOM percentage is a wish, not a plan. Investors run this cross-check on your deck whether you did or not.