Finance · Free tool
Cap Table Calculator
Founders about to raise money want to know one thing: what do we each own after the option pool and the new investor come in? This cap table calculator takes the founders' split, an option pool, an investment amount, and a pre-money valuation, and shows the before-and-after ownership for everyone at the table.
- OutputBefore-and-after ownership
- No sign-up
- Copy or print the result
- How it works ↓
Your entries stay in this browser. Use Fill example to see a finished page first.
What this finance tool gives you
The output leads with post-money value, the investor's share, and the share count. A table then lists each founder, the pool, and the investor with ownership after the pool, ownership after the round, and a share number out of 1,000,000. It is a clean page to bring to a term-sheet discussion.
What you enter
- Currency: USD by default, or EUR or GBP (only changes how amounts are formatted)
- Founders: a name and a share % for each founder; the shares must add up to 100
- Option pool, %: set aside before the investment, from 0 up to but not including 100 (0 if there is no pool)
- Investment amount: new money in the round; blank or 0 if there is no round
- Pre-money value: the company's valuation before the investment (required when there is an investment)
Worked example
In the tool's example, Maya, Jonah, and Priya split the company 50/30/20, set a 10% option pool, and raise $400,000 at a $1,600,000 pre-money value. Post-money is $2,000,000, so the investor owns 20%. After the pool Maya holds 45%; after the round she holds 36%, or 360,000 shares. Jonah ends at 21.6%, Priya at 14.4%, and the pool at 8%.
How does the cap table calculate dilution?
First the pool is carved out: each founder's stake after the pool = founder share × (1 − pool %). The ratio among founders does not change. Post-money value = pre-money value + investment, and the investor's share = investment ÷ post-money value. Everyone already on the table, founders and pool alike, is then multiplied by (1 − investor share).
The tool assumes 1,000,000 shares in total and assigns whole shares by rounding each holder down, then handing the leftover shares to the largest fractions. Founder shares must total 100 within 0.05, pool and amounts cannot be negative, and a warning appears if the pool is above 20%.
Tips before you use the result
- Enter the founders' split as it stands before the pool and the round; the tool applies both dilutions for you, so do not pre-dilute the numbers.
- Compare the result with and without the pool to show founders how much of their dilution comes from the pool rather than the investor.
- The 1,000,000 share count is illustrative. Your actual share count differs, but the percentages do not depend on it.
- This models the pool as created before the money comes in. If your term sheet sizes the pool differently, confirm the mechanics with your counsel.
Frequently asked questions
How do you calculate founder dilution after a funding round?
Divide the investment by the post-money valuation to get the investor's share, then multiply every existing holder's stake by one minus that share. In the example, $400,000 on a $2,000,000 post-money is 20%, so a founder holding 45% after the pool keeps 45% × 0.8 = 36%. This tool also applies the option pool first.
Why does the option pool dilute founders before the investment?
This calculator treats the pool as set aside before the new money arrives, which is how the pool is commonly structured in early rounds. That means the pool's cost falls on the founders, not the incoming investor. The founders' ratio to each other stays the same; each simply owns a smaller slice.
What is the difference between pre-money and post-money valuation?
Pre-money value is what the company is worth before the investment. Post-money value is pre-money plus the new investment. The investor's ownership is the investment divided by post-money, so a $400,000 check at a $1,600,000 pre-money buys 20% of a $2,000,000 post-money company.
Is my cap table stored on a server?
No. Founder names and percentages stay on your device in the browser's local storage, and there is nothing to register for. That makes it easy to try several pool sizes and valuations privately before you share a version with co-founders or investors.
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Results depend on the figures you enter; check them against your own records before you rely on them. Last updated: October 2026 · Kurums editorial team.
