Dilution Calculator
Model how your ownership percentage changes across funding rounds. Input your current ownership, new investment amount, and pre/post-money valuation to see exactly how much you'll be diluted.
Free tool
Open to everyone
Model your round without signing up. PDF export is free for 51% Brief subscribers.
Round design
Current cap table
SAFEs & convertibles
Round summary
Share price
$2.3224
Post-money
$32,083,333
Pool top-up pre-money
764,706 shares
SAFE/Note shares
897,059 shares
Ownership
Pre → PostConvertibles
Convertible 1
Applied price $1.1148 | Principal $1,000,000
What's included
- Single-round dilution modeling
- Multi-round scenario planning
- Option pool impact analysis
- Visual ownership charts
- PDF export of your model
Who it's for
- Founders raising capital
- Startup employees with equity
- Early-stage investors
FAQ
Does the model handle SAFEs and notes?
Yes—discount and cap are applied on a best-of basis, with optional interest and term for notes. Conversions use the post top-up, pre-round share price.
How do you treat option pool expansions?
Choose pre- or post-money. Pre-money top-ups dilute everyone ahead of the round; post-money hits after new capital is in. We show the new pool shares explicitly.
Will you email the results?
PDF export is available now, right from the calculator. It's free for 51% Brief subscribers—existing subscribers get an immediate download, and new subscribers just need to confirm the email we send before it starts.