Quick answer
SAFE conversion means the SAFE turns into shares during a priced round using the lowest price the document allows. In most simple models, that means comparing the cap price, the discount price, and the round price, then converting at the investor-favorable result required by the SAFE terms.
What a SAFE is
A SAFE is a financing instrument that usually converts into equity in a future priced round. In practice, the hard part is not the acronym; it is understanding which price applies, how the document defines dilution, and how conversion changes ownership across the cap table.
Cap vs discount (intuition)
- Valuation cap: sets a maximum valuation used for conversion, producing a lower conversion price if the priced round valuation is high.
- Discount: converts at a percentage off the priced round price per share (e.g., 20% discount).
- Many SAFEs convert at the better (lower price) of cap or discount (terms vary).
The decision rule in plain English
- If the cap price is lower than the discount price, the cap wins and the SAFE holder gets more shares.
- If the discount price is lower than the cap price, the discount wins and the SAFE holder gets more shares.
- If the SAFE is post-money, be extra careful with dilution assumptions because the founder dilution pattern is usually less forgiving than founders expect.
How to model conversion (simplified)
- Compute the priced round price per share = pre-money / fully diluted shares.
- Compute cap price per share = cap / fully diluted shares (if applicable).
- Compute discount price per share = round price * (1 - discount).
- Convert SAFE amount into shares at the lowest applicable conversion price.
What to verify in the SAFE
- Is the SAFE pre-money or post-money (dilution mechanics differ)-
- Does it include a cap, a discount, or both-
- What counts as a qualified financing and what is the conversion trigger-
- How are pro-rata rights handled, if any-
- Does the model use the same fully diluted share definition the legal documents use-
What founders usually miss
- The headline SAFE amount is not the dilution outcome. Conversion price mechanics determine the real share count issued.
- Option-pool changes, multiple SAFEs, and note conversions can move founder ownership more than the headline round valuation does.
- The safest workflow is to model the round before documents are final so the team sees the ownership math early.
Common mistakes
- Using shares that are not fully diluted (forgetting option pool and other convertibles).
- Mixing post-money SAFE mechanics with pre-money modeling assumptions.
- Treating the model as legal truth (always reconcile to the SAFE documents).