Calculator
SAFE Calculator
Calculate how your SAFE converts at Series A
Your ownership % is fixed at signing. Most common since 2018.
20% discount off Series A price
At Conversion
0.625%
After Series A
0.500%
Converts via Valuation Cap
Your cap gives you better terms than the discount.
Ownership
0.625%
Effective Price
$0.7950/share
Ownership
0.250%
Effective Price
$2.0000/share
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How the SAFE calculator works
This SAFE calculator shows what percentage of a company your SAFE converts into at a priced round. It models post-money and pre-money SAFEs, valuation caps, discounts, and stacks of multiple SAFEs, then applies Series A dilution.
Post-money SAFE conversion
With a post-money SAFE, your ownership at conversion is your investment divided by the valuation cap. The calculator also works out what the discount would give you at the Series A price and uses whichever method gives you more ownership.
The Series A then dilutes everyone. Ownership after the round = ownership at conversion x (1 minus Series A raise / Series A post-money valuation).
Worked example
A $50,000 post-money SAFE with an $8M cap converts to 0.625% of the company.
If the Series A raises $5M at a $25M post-money valuation, new investors take 20%, so your stake after the round is 0.5%.
Multiple SAFEs
In stack mode each post-money SAFE keeps the ownership fixed by its own cap. The calculator adds them up, shows what founders hold before the Series A, and applies the Series A dilution to everyone.
Common questions
- How do I calculate ownership from a post-money SAFE?
- Divide your investment by the post-money valuation cap. $50,000 on an $8M cap is 0.625% at conversion, before the priced round dilutes it.
- Cap or discount: which one applies?
- Whichever gives the investor more shares. The calculator computes both and shows which one wins for your inputs.
- What is the difference between a pre-money and a post-money SAFE?
- A post-money SAFE fixes your ownership at investment divided by cap, no matter how many other SAFEs are issued. A pre-money SAFE converts against the shares that exist before the SAFEs, so other SAFEs dilute you.