About

Founder Math is a free, growing library of interactive calculators for the financial mechanics of building and funding a startup: SAFE conversions, dilution, cap tables, runway, and the return math founders and investors run every day.

Everything here is free and public. No login, no email gate, nothing saved. Drag the sliders, check the numbers yourself, and move on.

One new calculator ships every week, each with a short write-up explaining the logic behind it.

Enjoy the ride!

Hello, I'm Diego Greco — a Venture Capital Analyst working with early-stage founders.

I know how this works from both sides of the table. Before moving to the investor side, I worked as a Founder's Associate, helping to raise a Seed round by building out 3-year financial projections and pitching directly to VCs. I have also navigated the early startup journey firsthand as the co-founder of Cresta, a computer vision startup that won the Popular Vote at the 2025 University Startup Challenge in Milan before I paused the project to begin my CEMS Master's journey across Singapore and Dublin.

Because I evaluate deals today and have built the financial models in the past, I see the exact same mechanical errors trip up founders every week. Founder Math started as a small side project to solve that friction. It has slowly become something I care about deeply for its own reason: giving founders the tools to understand their own metrics.

Venture Capital looks like a black box from the outside, and it shouldn't. The math behind a term sheet isn't actually complicated, it's just rarely explained.

More often than not, the same simple math gets rebuilt from scratch every time: a founder opens Excel to check their own cap table, or asks a friend who works in finance to run the numbers, or just takes someone else's word for it because building the model felt like too much work. None of that should be necessary for math this straightforward.

That's the gap this project is trying to close. Not because the math is hard, but because nobody should have to build a spreadsheet (or rely on someone else) just to check it themselves.