Equity Dilution Simulator

Model how funding dilutes ownership

Raising money and creating an option pool dilute existing shareholders, and founders are often surprised by how much. This simulator models dilution from a post-money investor percentage and an option pool, so you see your resulting ownership.

Why dilution catches founders out

When investors buy a share of the company, existing owners’ percentages shrink proportionally, because new shares are issued. An option pool for employees dilutes further, and it is often created just before a round, so it comes out of the founders’ stake. The interaction, and the fact that the pool is usually calculated post-money, means the real dilution is larger than the headline investor percentage suggests. Simulating it shows your actual ownership after the round, which is essential for negotiating terms and understanding what you are giving up, rather than being surprised at the cap table.

A planning estimate

This is an estimate for planning from the figures you enter, not financial or business advice. Real outcomes depend on factors beyond any single calculation, so treat the result as a guide. It runs entirely in your browser, so your figures are never uploaded and stay on your own machine, which matters for business numbers you would not want to share.

Related tools

• Incident Impact Calculator — Estimate the cost of a security incident from severity, affected users and downtime hours, with a compliance and trust rating and the response actions each severity level demands.
• Third-Party Risk Assessor — Assess vendor risk based on data access and type.
• Data Breach Cost Estimator — Estimate what a data breach would cost from records exposed, cost per record, days to detect and hours of downtime, split into direct and indirect costs.
• SaaS Risk Heatmap — Pick the SaaS apps your company runs, add your own, and get a heatmap ranking each by data criticality times access scope, with the risk each carries.