The maximum valuation at which a SAFE or convertible note will convert into equity, protecting early investors from excessive dilution.
The valuation cap is a term in a SAFE or convertible note that sets a ceiling on the company's valuation for purposes of calculating how many shares the investor receives. It protects early investors: even if the company raises a priced round at a much higher valuation than the cap, the investor's instrument converts as if the valuation was at or below the cap, giving them more shares.
For example, if an investor holds a SAFE with a $5 million cap, and the company raises a Series A at a $15 million pre-money valuation, the SAFE converts using the $5 million cap — giving the investor three times more shares than they'd get without the cap. The cap rewards early investors for the additional risk they took before the company's value was established.
The cap is also the closest thing to a current valuation that a SAFE or pre-revenue startup has. When founders say "we're raising at a $5M cap," they mean SAFEs will convert as if the company were valued at $5 million — though the company isn't actually setting a valuation in a legal sense. If there are multiple SAFEs with different caps, the conversion math can get complex when a priced round closes.