SAFE Note Conversion Calculator
See exactly how a SAFE converts into shares at your next priced round — cap vs. discount, conversion price, and resulting ownership.
The SAFE & the priced round
SAFE Converts At
$0.80/share
Valuation cap sets the price (lower than the discount price)
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Last updated: August 5, 2026 · Reviewed by the DoCalc team
What Is a SAFE Note Conversion Calculator?
A SAFE doesn't set a price for the company upfront — it converts into equity later, at the company's next priced round, based on whichever is more favorable to the investor: a valuation cap (a ceiling on the conversion valuation) or a discount off the round's price. This calculator runs both, picks the winner, and shows exactly how many shares the SAFE converts into.
The Formula
The SAFE always converts at whichever price is lower — that's what makes it more favorable to the investor, since a lower price means more shares for the same investment.
Worked Example
A $500,000 SAFE with an $8,000,000 cap and 20% discount, converting at a priced round with a $12,000,000 pre-money valuation and 10,000,000 shares outstanding:
The cap won here because the company's valuation grew enough between the SAFE and the priced round that the cap price ($0.80) ended up lower than the discounted round price ($0.96). If the round had priced closer to the cap, the discount might have won instead.
Cap vs. Discount: Which Wins?
| Scenario | Likely winner |
|---|---|
| Company valuation grew a lot since the SAFE | Cap (protects early investor from paying today's higher price) |
| Company valuation grew only modestly | Discount (the % off may produce a lower price than the cap) |
Pros and Cons of SAFEs
Pros: faster and cheaper to execute than a priced round, defers the hard question of exact valuation, standard, well-understood terms (especially the YC template).
Cons: multiple SAFEs at different caps can create a complex, hard-to-model cap table before the priced round; founders sometimes underestimate total future dilution from stacking several SAFEs.
Who Should Use This Calculator
Use it if you're a founder modeling how existing SAFEs will convert at an upcoming priced round, or a SAFE investor checking your expected ownership.
For the dilution effect of the new round itself, pair this with the Cap Table Dilution Calculator.
Common Mistakes to Avoid
The most common mistake is assuming the discount always applies — it's actually whichever of the cap or discount produces the lower price, and that can flip depending on how much the valuation moved. A second mistake is forgetting that multiple SAFEs, each with different caps, all convert independently at the same round — model each one separately. A third is not accounting for how SAFE conversion itself adds to total dilution alongside the new round's own investors.
Expert Recommendation
Model every outstanding SAFE's conversion before finalizing a priced round's terms — the combined dilution from multiple converting SAFEs plus the new round's investors is often larger than founders expect from looking at any single instrument in isolation.
Frequently Asked Questions
What is a SAFE?
A SAFE (Simple Agreement for Future Equity) is a common early-stage fundraising instrument, popularized by Y Combinator, that isn't a loan and doesn't accrue interest — it's a right to receive equity later, converting into shares when the company raises a priced round, at terms set by a valuation cap and/or a discount.
What's the difference between a valuation cap and a discount?
A valuation cap sets a maximum company valuation the SAFE converts at, protecting early investors if the company's value grows a lot before the priced round. A discount gives the SAFE holder a percentage off the price the new round's investors pay. Most SAFEs include both, and the investor gets whichever produces more shares — the lower effective price.
Why did the cap "win" over the discount in this example?
Because the cap price per share ($0.80) was lower than the discounted round price ($0.96) — the SAFE holder always converts at whichever price is lower, since that produces more shares for the same investment. If the company's valuation had grown less between the SAFE and the priced round, the discount might have produced the lower price instead.
Does this account for dilution from the new round's own investors?
No — this calculator shows the SAFE holder's ownership relative to the shares outstanding before the priced round, to isolate the SAFE conversion mechanics. The new round's investors will also receive shares, which dilutes everyone (including the just-converted SAFE holder) further — that's a separate step in building the full post-round cap table.
Do multiple SAFEs convert differently from each other?
Yes — each SAFE has its own cap and discount terms, and converts independently based on its own terms at the same priced round. A company with several SAFEs from different rounds of fundraising may have several different conversion prices all resolving at once.
Conclusion
A SAFE's conversion price isn't fixed until the next priced round happens — it's always the lower of the cap or discount price at that moment. Run your specific numbers above to see exactly which term binds, and how many shares that converts into.
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