Fundraising

Cap Table Math for First-Time Founders: How a Pre-Seed SAFE Actually Dilutes You

The arithmetic nobody shows you before your first raise, worked out round by round.

A founder working through ownership numbers on paper at a kitchen table in morning light.
The short answer

A pre-seed SAFE dilutes you by the cash raised divided by the post-money cap. Raise $500K on a $5M post-money cap and investors own 10 percent. An option pool and a priced seed then dilute you further, so founders commonly hold 60 to 70 percent after seed.

A pre-seed SAFE dilutes you by the cash raised divided by the post-money cap. Raise $500K on a $5M post-money cap and investors own 10 percent. An option pool and a priced seed then dilute you further, so founders commonly hold 60 to 70 percent after seed. Here is the math, round by round.

Why founders get blindsided by dilution

The reason dilution feels like a surprise is that a SAFE does not show up on your cap table as equity until it converts. You sign it, the money lands, and your ownership on paper still reads 100 percent. The dilution is real but invisible until your priced seed round, when every SAFE converts at once and the founder ownership number drops in a single step.

The fix is to do the math up front, before you sign anything. The arithmetic is simpler than it looks, especially with the post-money SAFE that most US pre-seed rounds now use. You can see why the SAFE wins on speed and cost in this breakdown of SAFEs, convertible notes, and priced rounds at pre-seed.

The one formula you need

For a post-money SAFE, investor ownership is dead simple:

Investor ownership = amount raised divided by the post-money cap.

Raise $500K on a $5M post-money cap and investors own exactly 10 percent. That is the whole point of the post-money SAFE: the investor locks their percentage, and you carry the dilution from any further SAFEs you raise before the priced round. It is less founder-friendly on dilution than the old pre-money SAFE, but you always know exactly where you stand.

Working it through, round by round

Start with two founders holding 10,000,000 shares between them, 100 percent of the company. Watch what each event does. These numbers are illustrative, rounded to keep the logic clear.

Event New money Post-money cap or valuation New stake created Founder ownership after
Starting point - - - 100%
Pre-seed SAFE $500K $5M post-money cap 10% 90%
Option pool top-up - - 10% ~80%
Priced seed round $2M $10M post-money 20% ~64%

Two things to notice. First, the option pool comes out of the existing shareholders, which in practice means it comes out of you, not the new investors, because investors usually require the pool to be in place before their money goes in. Second, the SAFE and the pool both convert into the cap table at the priced seed, which is why founder ownership steps down sharply at that round rather than gradually.

The mistakes that cost the most equity

Three errors do the most damage at pre-seed.

Raising on too low a cap. A friendly early angle on valuation feels generous in the moment, but a low post-money cap means a bigger slice handed over for the same dollars. Tie your cap to a defensible milestone story, not to whatever closes the round fastest.

Stacking SAFEs without modeling them together. Each SAFE looks small alone. Three SAFEs at different caps stack into more dilution than founders expect, and with post-money SAFEs you absorb all of it before the priced round. Model the combined effect, not each note in isolation.

Sizing the round by feel. The amount you raise drives the dilution directly, so raising more than you need to hit the next milestone is just selling cheap equity. Size the round to the milestone, which is the logic in how much to raise at pre-seed.

Run your own numbers before you sign

Build the table above in a spreadsheet with your real caps and round sizes before you take any term sheet. The point is not to fear dilution, which is the cost of fuel, but to spend it deliberately. If you want the full sequence of decisions a raise runs through, the step-by-step pre-seed fundraising process lays them out in order, and the complete playbook lives in The Funding Framework.

Frequently asked questions

How much do founders typically own after a pre-seed and seed round?
It varies, but a common path leaves founders holding roughly 60 to 70 percent after a seed round. A pre-seed SAFE often takes around 10 to 15 percent, an option pool another 10 percent, and a priced seed another 15 to 25 percent. The exact figure depends on your caps and round sizes.
Does a post-money SAFE dilute me more than a pre-money SAFE?
A post-money SAFE fixes the investor's ownership percentage, so you carry all the dilution from any later SAFEs raised before the priced round. It is more founder-unfriendly on dilution but far easier to calculate, which is why most US pre-seed rounds now use it.
When does a SAFE actually hit my cap table?
A SAFE is not on the cap table as equity until it converts, which usually happens at your priced seed round. Until then it sits as a promise to issue shares. Founders get surprised because the dilution is real but invisible until conversion.
Should I raise on a SAFE or a priced round at pre-seed?
Most US pre-seed rounds use a SAFE because it is faster and cheaper to close. A priced round makes sense when investors want board rights or the round is large enough to justify the legal cost. The cap-table impact differs, so model both before deciding.
From the book

Run your raise with a system, not a guess.

This is the kind of thinking The Funding Framework walks through, step by step, from story to close.

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