Free calculator · Venture & Startup Finance
Post-Money SAFE, Ownership at Signing
Calculates the ownership a post-money SAFE fixes at signing, the investment divided by the post-money valuation cap, and shows how additional SAFEs on the same cap dilute the founders rather than earlier SAFE holders. Inputs are the SAFE investment, the post-money valuation cap, and other SAFE money raised on the same cap.
By Devon Coombs, CPA, MBA · Teaching Professor of Finance, Santa Clara University · Reviewed August 2026
From the author: Devon Coombs, CPA, MBA teaches finance at Santa Clara University and works with corporate teams on practical AI.
AI training for finance teams · Consulting · The 10 Laws of Finance
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Post-Money SAFE, Ownership at Signing
This SAFE's ownership
10.0%
fixed at signing
Founder dilution
20.0%
from all SAFEs on this cap
Ownership formula
SAFE ÷ cap
$0.50M ÷ $5.0M
Total SAFE money
$1.00M
all on the same cap
The post-money cap gives each SAFE holder a precise percentage at signing. The catch: because every holder's stake is locked, all the dilution from later SAFEs on the same cap lands on the founders, not the earlier investors.
Learn the concept
This calculator comes from the free Entrepreneurial Finance course, where the concept is taught with readings, worked examples, and practice questions.
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Built by Devon Coombs, CPA, MBA, Teaching Professor of Finance at Santa Clara University.