See what this round means two rounds from now. Dilution across this round + Series A, with option pool, founder splits, and your exit payoff.
| Holder | Today | After this round | After Series A |
|---|
When new investors put money in, the company issues *new* shares to them. Your share count stays the same — but the total share count goes up. So your **%** of the company drops, even though your share count is unchanged.
Example: you own 100 shares of 100 total = 100%. Investor buys 25 new shares. Now there are 125 total. You still own 100, but that's 80% of the company.
This is the trick most first-time founders miss. When investors agree to a "10% pool", that pool is created **in the pre-money** — *before* the investor's dollars hit the cap table.
That means existing shareholders (you) get diluted by the pool. The new investor still gets exactly their % of post-money. Net effect: a 10% pool on a $10M post is paid for entirely by the founders.
You can negotiate this. Smaller pool = less founder dilution. But you'll need to top it back up at the next round.
Rough rule of thumb: 3× the post-money of the prior round. So a $10M post-seed should lead to ~$30M Series A.
2× is a soft round. 1× is a flat round (you might still get done but it signals trouble). Below 1× is a down round and usually triggers anti-dilution clauses that make things worse.
The "right" raise amount is roughly 20–25% dilution per round. Above 30% and you're giving up too much; below 15% and you're probably leaving capital on the table.
Preferred shares (what investors get) usually have a 1× liquidation preference: at exit, they get their money back before common shareholders see a dime.
At a healthy exit (say, 5× the last valuation), this rarely matters — everyone converts to common and takes their share. But at a low exit, preferences can mean founders walk away with much less than the simple % math suggests.
This tool assumes everyone converts to common (the "good exit" case). Don't take it as gospel for a fire sale.
Beyond Series A, the model gets fuzzy. Series B valuations depend on metrics you don't have yet. Adding more rounds compounds assumptions until the numbers tell you nothing.
Two rounds is enough to answer the real question: is this round the right size given what's coming next?