From the team at Flowjam · Last updated July 2026

First, the scary version

This is what makes founders panic: their ownership sliding down every round. Now watch the second number.

Most founders learn dilution the scary way: a term sheet lands, a number gets smaller, and panic sets in. But dilution is just arithmetic. Once you can do the arithmetic you stop fearing the wrong things and start negotiating the right ones. This is the math, in plain numbers, answering the questions actually in your head at 2am.

How much do I actually give up per round?

If you raise $2.5M on a $12M pre-money valuation, the post-money is $14.5M and the new investors own 2.5 / 14.5 = 17.2%. That 17.2% is created new, so every existing shareholder — you, your cofounder, earlier investors — is diluted proportionally. Nobody hands over shares; the pie just gets bigger and everyone's slice shrinks.

Add the option pool and the picture changes in a way that catches founders off guard, covered below. Add both together and you get the total dilution for the round.

What does a real cap table look like from pre-seed to Series B?

Here is one founding team's equity tracked through four priced rounds at realistic 2026 valuations. The percentage that scares you and the number that pays you move in opposite directions. Learn to watch the second one.

Assumes a 10% option pool top-up at seed and smaller top-ups after. "Founders' stake" is ownership × post-money valuation — paper value, not cash.

Is 20% dilution normal, or am I getting screwed?

For a priced round, giving up roughly 10-25% is normal and healthy. Here is the quick gut-check:

• Under 10%: either a small round or a very hot deal. Fine, as long as you raised enough to hit the next milestone.
• 10-20%: the sweet spot for most seed and Series A rounds.
• 20-30%: common when you raise a larger round or add a big option pool. Watch that the pool is sized to actual hiring needs, not padded.
• Over 30% in a single priced round: a yellow flag. You are either raising too much too early or the valuation is low. Push on pre-money before you push on anything else.

Dilution alone never tells you if a deal is good. A 25% round at a strong valuation with clean terms beats a 12% round with a stacked liquidation preference. Percentage is the headline; the terms are the story.

Why did the option pool eat my equity before the investors even showed up?

This is the single most misunderstood mechanic in a fundraise, so slow down here. When an investor asks you to create or expand an employee option pool, that pool is almost always carved out of the pre-money valuation, which means founders absorb it, not the new investors. This is the "option pool shuffle."

Say you agree to a 10% post-money option pool at your seed. Because it comes out of pre-money, it dilutes you on top of the investor's share. In our example the seed round's 17.2% investor stake plus a 10% pool means founders take roughly a 27% haircut that round, most of it before a dollar of new money is counted against the investors.

What one negotiation is actually worth

The same seed round, negotiated three ways. This is why the calculator matters: small input changes compound into real ownership.

Each is the founders' ownership right after seed. The gap only widens through Series A and B, because every later round dilutes the bigger starting number.

When does dilution actually get dangerous?

Losing percentage is normal. Losing control and losing upside to bad terms are the real risks. Watch these:

• Liquidation preferences. A 1x non-participating preference is standard and fine. Participating preferences or multiples (2x, 3x) mean investors get paid first and share the rest, so your effective ownership at exit can be far below the cap table number.
• Board control. Track board seats separately from equity. You can own 40% and still control the company, or own 55% and not. Do not trade a board seat lightly.
• Pro-rata rights. Big investors keeping their percentage in later rounds is normal. Just know it concentrates ownership and can crowd out new leads.
• Stacking rounds too fast. Each round compounds. Raising more than you need, too early, at soft valuations is how founders end up under 20% before Series B with nothing to show for the extra cash.
• Down rounds and anti-dilution. If you raise a later round at a lower valuation than the last, earlier investors' anti-dilution provisions can kick in and reprice their shares, diluting founders far more than the headline number. Broad-based weighted-average anti-dilution is standard and mild; full-ratchet is punishing and worth fighting. A down round hurts, but the math is survivable if you understand who gets protected first.

One quiet lever runs under all of these: leverage. The founder with three term sheets negotiates a higher pre-money and a smaller pool, and keeps more of the company. Everything you do before the raise — traction, a tight story, a clean data room — is really about building that leverage so you are choosing between offers, not begging for one.

How do I model my own cap table?

Open the free calculator and work top to bottom — it is built so you only touch the blue cells:

1. Cell B4: your founders' combined starting ownership (usually 100%).
2. Column B: money raised in each round.
3. Column C: the pre-money valuation you are offered or targeting.
4. Column F: the option pool percentage added that round (model the shuffle here).
5. Column H then shows your ownership after each round automatically, and the summary shows your final stake and total raised.

Change one input and watch the whole waterfall move. That is the fastest way to answer "what if we raised $1M less?" or "what does a 15% pool cost me?" before you are sitting across from an investor.

Pre-money vs post-money SAFEs, the one gotcha

Most pre-seed money in 2026 comes in on SAFEs, not priced rounds. The critical detail: a post-money SAFE (the standard YC version) locks in the investor's percentage after the SAFE money but before the next priced round, which means you absorb the dilution when those SAFEs convert and stack. Add up all your SAFEs before you sign the next one; a pile of "small" post-money SAFEs can quietly cost you 20%+ at conversion. Model each SAFE as its own line in the calculator so nothing hides. If you are weighing how to raise this money in the first place, our SAFE vs priced round guide and convertible note template break down the trade-offs.

Frequently asked questions

How much equity do founders keep after Series A?
Commonly 40-60% combined, depending on how much was raised and how big the option pools were. In the worked example above the founding team holds about 48.5% right after Series A.

Does dilution mean I am losing money?
No, in a healthy raise the opposite. Your percentage drops but the value of that percentage should rise because the company is now worth more. In the example, founders fall to ~39% by Series B while their stake grows to roughly $56M on paper.

What is the option pool shuffle?
When a new option pool is carved out of the pre-money valuation, so founders absorb the dilution rather than sharing it with the incoming investors. Negotiating pool size is one of the highest-leverage things a founder can do in a term sheet.

How do post-money SAFEs affect dilution?
A post-money SAFE fixes the investor's ownership after the SAFE round, so founders bear the dilution when SAFEs convert at the next priced round. Stacked SAFEs can add up to significant founder dilution, so total them before raising again.

What is a normal amount of dilution per round?
Roughly 10-25% for a priced round. Under 10% is light, over 30% in a single round is worth questioning, usually a sign to negotiate a higher pre-money or raise less.

What is a down round and how does anti-dilution work?
A down round is a raise at a lower valuation than your previous one. When it happens, earlier investors' anti-dilution provisions can reprice their shares to protect them, which dilutes founders extra. Weighted-average anti-dilution is the common, milder form; full-ratchet is aggressive and worth negotiating out before you ever sign.