What is startup valuation?
Startup valuation is the dollar figure a company and its investors agree it is worth at a funding round — either before the new money arrives (pre-money) or after it's added (post-money). For a pre-revenue or early-revenue company, it isn't an appraisal of physical assets; it's a negotiated bet on team, market size, and traction, benchmarked against what comparable companies raised at the same stage. Every SAFE conversion, every priced round, and every dilution calculation on this site starts from this one number.
Founders who chase the highest headline valuation instead of the right one often pay for it later: an inflated Seed valuation just raises the bar the next round has to clear, and missing that bar produces a down round — a result that damages morale and cap table health far more than raising a smaller round at a fair price would have.
Pre-money vs. post-money: the formula
The two numbers differ by exactly the size of the round being raised: Post-Money Valuation = Pre-Money Valuation + Round Size. The investor's resulting ownership percentage is Round Size ÷ Post-Money Valuation — not round size divided by pre-money, which is the single most common valuation math mistake founders make when reading a term sheet out loud.
Founders usually quote the pre-money number because it's what they were 'worth' going in; investors think in post-money because it's what determines their actual stake. Both numbers describe the same round — mixing them up is how founders end up surprised by how much of the company a round actually cost them.
| Pre-Money | Post-Money | |
|---|---|---|
| What it measures | Company value before new investment | Company value after new investment is added |
| Formula | Post-Money − Round Size | Pre-Money + Round Size |
| Investor ownership | Not used directly for % | Round Size ÷ Post-Money |
| Who quotes it | Founders, in headline terms | Investors, when sizing their stake |
A worked example: $2M at an $8M pre-money valuation
Take a $2M round closing at an $8M pre-money valuation. Post-money is $8M + $2M = $10M, and the investor's stake is $2M ÷ $10M = 20%. The founding team's ownership drops by that same 20%, before any option pool refresh is added on top.
Run that math on the free dilution calculator on this site and it produces the identical number in seconds — useful for stress-testing a term sheet before you sign it, or for modeling what a bigger ask does to your post-money ownership before you walk into the negotiation.
$8M
Pre-Money Valuation
$2M
Round Size
$10M
Post-Money Valuation
How investors actually arrive at a number
There's no formula that spits out a valuation on its own; investors triangulate. At Seed and Series A, the two dominant methods are comparable transactions — what similar-stage, similar-sector companies raised at, per data sources like Carta and PitchBook — and a revenue multiple, when there's ARR to multiply. Pre-revenue teams get priced almost entirely on comparables: team track record, market size, and traction signals like waitlist growth or pilot conversions.
Sector changes the multiple. A Health-Tech company with a signed hospital pilot commands a different valuation logic than a Green-Tech company still pre-permit or an Edu-Tech company selling into a single semester's procurement cycle — regulatory risk and sales-cycle length get priced in, not just growth rate.
Valuation cap vs. a priced round's valuation
A SAFE doesn't set a valuation — it sets a valuation cap, the maximum price at which it converts into equity at the next priced round. A priced round, by contrast, sets the valuation directly and issues shares immediately. Confusing the two is common: a $5M SAFE cap is not the company's valuation, it's a ceiling that only matters if the next round prices higher.
That distinction matters because SAFEs stacked at different caps convert unevenly, sometimes at odds with what founders assumed the company was 'worth.' Our post on what a SAFE actually is walks through the cap, discount, and conversion mechanics in full.
Common valuation mistakes founders make
The most expensive mistake is optimizing for the biggest headline number instead of the one the next round can clear. A too-high Seed valuation buys short-term ego and a much harder Series A, since growth has to outrun an already-stretched multiple. A close second: negotiating pre-money while forgetting the option pool is carved out of it — a round that looks like 20% dilution can cost founders closer to 30% once the pool refresh lands.
A third: treating valuation as a one-round decision. The number that actually matters is founder ownership after the next two rounds, not this round's percentage in isolation — which is exactly why cumulative dilution, not any single round, is what experienced investors read when judging cap table health.
Test valuation decisions in the simulation
Founder Runway runs a 20-turn arc from Pre-Seed to Series A, and every funding decision — including the valuation you negotiate or accept — marks your cap table and investor trust in real time. Run a Health-Tech scenario and push for an aggressive valuation before your pilot data is strong enough, then watch how investor trust and your next round's terms react; run the same decision in a Green-Tech or Edu-Tech scenario and the sales-cycle and regulatory pressure change what a 'fair' valuation looks like entirely.
It's the fastest way to feel the gap between a valuation that looks good on a term sheet and one your next round can actually justify — without paying for the lesson with a real cap table.
Conclusion
Startup valuation is pre-money plus the round size, nothing more mystical than that — but the investor's ownership math (round ÷ post-money) and the sector-specific reasoning behind the number are where founders actually get it wrong. Model both sides of every term sheet, track cumulative ownership across rounds, and treat the headline valuation as a starting point, not a scoreboard. The free dilution calculator on this site turns your own round size and valuation into founder-ownership math in seconds.
Frequently asked questions
What is pre-money valuation?
Pre-money valuation is what a company is worth immediately before a funding round's new investment is added. It's the number founders typically quote in negotiations, and it's the base the post-money valuation and investor ownership percentage are calculated from.
What is post-money valuation?
Post-money valuation is pre-money valuation plus the round size — the company's value immediately after the new investment is counted. Investor ownership is always calculated as round size divided by post-money, not pre-money.
How do investors decide a startup's valuation?
Mostly through comparable transactions — what similar-stage, similar-sector companies raised at recently — plus a revenue multiple where ARR exists. Team track record, market size, and traction signals fill the gap for pre-revenue companies, and sector risk adjusts the multiple up or down.
What's a good valuation for a Seed round?
There's no universal number — it depends on sector, traction, and market comparables — but the more useful question is whether the valuation lets you clear the next round's bar. A valuation your growth can't outrun by Series A creates a down-round risk that's more damaging than raising at a lower number would have been.
Does a higher valuation always mean a better deal?
No. A higher valuation raises the bar your metrics must clear before the next round, and it doesn't change the option pool math or cumulative dilution across rounds. Weigh valuation against the sustainability of the next round's terms, not as a win on its own.
Test this decision in the game.
Apply the same assumption across one run; which metric burned three turns later?