Decision calculator
Equity Dilution Calculator
Model dilution from new shares and option-pool expansion, implied pre- and post-money valuation, your stake's value, and dilution across future rounds.
Modeled result
Calculating…
Results update as you change the inputs.
Methodology and assumptions
Post-issue shares = existing + new investor shares + new pool shares. Post-issue ownership = current ownership × existing ÷ post-issue shares. Price per share = investment ÷ new investor shares; post-money valuation = price × post-issue shares; pre-money = post-money − investment. The round projection repeats this round's dilution factor. Liquidation preferences, convertibles, and anti-dilution terms are excluded.
Currency outputs are rounded to the nearest minor currency unit.
Pricing last verified:
Frequently Asked Questions
What does the Equity Dilution Calculator calculate?
Model dilution from new shares and option-pool expansion, implied pre- and post-money valuation, your stake's value, and dilution across future rounds.
How accurate is the Equity Dilution Calculator?
It is a planning estimate based on the inputs, formula, assumptions, and sources shown on this page. Actual prices, invoices, taxes, discounts, and outcomes can differ.
Which pricing source does the Equity Dilution Calculator use?
The calculator links to Investor.gov dilution definition as its official source. The displayed pricing or reference data was last verified on 2026-10-01.
Are calculator inputs saved or sent to analytics?
Inputs are processed in your browser. Calculator values are not included in analytics events.