How big should your pre-seed raise be

Every pitch deck contains the same slide, and nearly every one of them reads like a wish list: marketing, sales, engineering, operations, contingency. Founders rarely treat the amount as a design decision, yet it's the decision that shapes everything after it — how much equity you give up, how hard the next round is, and how much of your company survives the eighteen months after it.

The real question

Forget "how much can I raise?" The question is "what proof do I need to raise the next round, and how long will it take to build it?"

Pre-seed money exists for one job: to produce evidence. Not to build the whole vision. Evidence means things like a working product with real users, retention data, revenue, or a waitlist that converts. If your pre-seed can't be pointed at a specific evidence milestone, the number is arbitrary — and both the amount and the equity price will feel wrong later.

The calculation

1. Pick the milestone. The single experiment that unlocks your next round (first 50 paying customers, 30% week-over-week active growth, whatever your category demands).
2. Estimate the time. Honestly. Add friction nobody budgets for.
3. Add the buffer. Raise will take two to three months longer than your plan. Price-shop for a better answer? No — price-shop for more headroom.
4. Cap the burn. The number of months of runway is a function of the evidence timeline, not a lifestyle. Founders who raise $1.5M and burn $60k a month get 25 months of runway. Founders who raise $1.5M and spend like a Series A get nine.

Two numbers that usually matter more

• The extra 20%. The average raise runs out early — diligence takes longer than expected, investors drag their feet, and the company that looks desperate at the end pays for it in dilution. Bake it in now, spend it last.
• The dilution ceiling. If your pre-seed is 40% of the company, nobody's happy. As a rough target, founders should end this round owning at least 60–70% of something that's worth more than before. If the math doesn't work at that price, the question isn't the number — it's the story.

Signs you're sizing wrong

• You can't name the evidence milestone out loud in one sentence
• The round funds fifteen months but only six are needed for proof — you'll give up extra equity for nothing
• The plan has "hiring" before "revenue"
• The only answer to "why this number?" is "because that's what others raised"

A pre-seed round is a battery, not a prize. Size it to power exactly the experiment that gets you to the next charge. Everything else is expensive theater — and the crowd on the board can usually tell the difference.