Business Growth Calculators for Startups and Marketers

Growth-stage decisions live and die by a handful of metrics: how much it costs to acquire a customer, how much you earn back from ad spend, how many months of runway sit in the bank, and how a small recurring deposit compounds over a decade. Getting these numbers wrong is how promising startups quietly run out of money. Getting them right is how disciplined operators outlast competitors with deeper pockets.

The calculators in this category translate the standard SaaS and marketing formulas — ROAS, CAC, burn rate, compound interest — into instant answers you can drop into a board update or a Friday planning session. Each tool documents the formula and assumptions so you can defend the number, not just quote it. Run them in your browser; nothing is logged or sent anywhere.