SyndicatePath Tools · For Founders & Investors

Startup Dilution & SAFE Calculator

Model equity dilution from a priced round, or calculate ownership from a YC-standard post-money SAFE. Pick your instrument below.

Instrument

Pre-money valuation (USD) Amount raised (USD) Your current ownership (%)

Investing in a round? Check if you're accredited → Accredited investor checker →

How the math works

Priced round dilution

Post-money valuation = pre-money + amount raised
New investor ownership = amount raised ÷ post-money valuation
Dilution factor = pre-money ÷ post-money (fraction of prior stake each existing holder keeps)
Your ownership after = your ownership before × dilution factor

Post-money SAFE (YC standard, post-2018)

SAFE investor ownership at conversion = SAFE investment ÷ post-money valuation cap
This fraction is fixed at signing. Option pool expansions and future dilution events dilute existing holders, not the SAFE investor.

Partner tools for founders

Services we recommend for incorporating and running a raise. These are partner links; SyndicatePath may earn a commission at no cost to you.

doola →

Form and maintain your US LLC, plus bookkeeping and taxes.

Mercury →

Business banking built for startups. No monthly fees.

Northwest Registered Agent →

Registered agent and formation with privacy by default.

Estimates only. Educational tool, not legal, investment, or tax advice. Models a single instrument in isolation; actual cap tables involve multiple SAFEs, option pools, and negotiated terms. Consult a startup attorney or qualified advisor before signing any financing documents.

Related free tool

Raising on a SAFE through equity crowdfunding? The Crowdfunding Calculator shows the SEC Regulation Crowdfunding limit on how much each investor can put in.