What is a SAFE? A SAFE (Simple Agreement for Future Equity) is a startup financing instrument created by Y Combinator. Investors give money now in exchange for equity at the next priced round, at a discount or capped valuation. This calculator uses the post-money SAFE model (YC standard since 2018).
SAFE Terms
$
$
Next Priced Round
$
$
shares
%
Investor Ownership
—
at conversion
Effective Price/Share
—
SAFE conversion price
Shares Issued
—
to SAFE investor
Founder Dilution
—
from this SAFE
Cap Table After Conversion
StakeholderSharesOwnership %Value (at round price)
Enter values above to see cap table
⚠️ Disclaimer: This calculator is for illustrative purposes only and uses simplified assumptions. Real SAFE conversions may involve pro-rata rights, MFN clauses, side letters, and other terms. Always consult a startup lawyer before signing any legal documents.
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How SAFE notes convert to equity

A SAFE (Simple Agreement for Future Equity) converts into shares at the next priced round. Post-money SAFEs, the standard Y Combinator form, fix the investor's ownership up front: investment divided by the post-money valuation cap.

Formula

Ownership (post-money SAFE) = Investment / Post-money valuation cap
Conversion price = lower of (Cap price, Round price x (1 - Discount))

Example

$500,000 on a $10M post-money cap = 5% ownership before the priced round. If the round price per share is below the cap price, the investor converts at the round price (or the discounted price, if a discount applies).

Frequently asked questions

What is the difference between pre-money and post-money SAFEs?

In a post-money SAFE the cap includes all SAFE money, so each investor's ownership is fixed and founders absorb dilution from later SAFEs. In older pre-money SAFEs, SAFE holders dilute each other.

How much dilution should founders expect from SAFEs?

Add up investment / post-money cap for every SAFE. Raising $1M in SAFEs at a $10M post-money cap means about 10% dilution before the priced round.

Does a SAFE have a discount?

Some do. Common forms offer a valuation cap, a discount (often 10-25%), both, or neither (MFN only). The investor gets whichever gives the lower conversion price.

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