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Pre-money valuation refers to the value of a startup before new investment is added. It’s the estimated worth of the company based on its current assets, team, traction, intellectual property, and future potential.
📌 Example: If a startup is valued at $5 million pre-money and raises $1 million, the post-money valuation is $6 million.
Post-money valuation is the company’s value after investment is included.
📌 Formula: Post-money valuation = Pre-money valuation + New investment
This number is crucial for investors because it determines the percentage of ownership they receive.
Valuation affects how much of the company you’re giving up in exchange for capital.
The lower the pre-money valuation, the more dilution founders face.
Founders and investors often talk past each other because one references pre-money and the other post-money.
👉 This miscommunication can lead to unexpected dilution or misaligned expectations.
To avoid surprises:
With convertible notes and SAFEs, the conversation shifts. These instruments often don’t set a valuation upfront, but use a valuation cap that acts like a post-money or pre-money metric.
Y Combinator’s updated SAFE is post-money based, which makes dilution easier to model for founders but can result in giving up more equity than expected.
🔗 Learn more: Y Combinator SAFE Guide
With a post-money SAFE, each investor’s percentage is locked in by the cap: purchase amount divided by the post-money cap. If you later raise additional SAFEs, those earlier holders are not diluted by them — the founders are. With pre-money SAFEs, by contrast, SAFE holders generally dilute each other as well. Neither is right or wrong, but you need to know which one you are signing and add every SAFE to your model.
Pre- and post-money valuation are easy to follow in a single round. In real startup funding, though, each round stacks on top of the last, and convertible money from one stage turns into equity at the next. A simplified, hypothetical example shows how it fits together.
For example, suppose founders raise $1M on post-money SAFEs with an $8M post-money cap. When those SAFEs convert, the holders will own $1M ÷ $8M = 12.5% of the company immediately before the Series A money comes in. No shares are issued yet, so the cap table still shows the founders at 100% — which is why SAFEs are easy to forget about.
Later, an investor offers $4M at a $16M pre-money valuation, for a $20M post-money. Because the Series A price is higher than the SAFE cap, the SAFEs convert at the cap. The ownership after the round looks roughly like this:
If the Series A term sheet also requires a new option pool in the pre-money, the founders’ 70% shrinks further. The lesson: the Series A headline valuation is not what determines your ownership on its own — the SAFE conversions and pool sit on top of it.
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