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Ownership and investment

Ownership and dilution simulator

Explore a simple equity round: enter the valuation, new investment and current ownership percentages to see a before-and-after ownership table.

3 minutesFree · No registration
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Build your starting point

Answer with what you know today. If something is unclear, select the option that reflects this.

0 / 8 fields completed

Use one currency. Changing it relabels amounts without converting them.

Pre-money: before receiving the new investment. Post-money: after including it.

Enter your own assumption. This tool does not value your company or recommend a price.

Cash contributed for newly issued equity, not a purchase of existing shareholders’ equity. Use 0 to see the position without investment.

All four fields must total 100%. At least two shareholders must have a positive ownership percentage.

All four fields must total 100%. At least two shareholders must have a positive ownership percentage.

Enter 0 if this shareholder does not exist. Up to four shareholders are supported.

Enter 0 if this shareholder does not exist. Up to four shareholders are supported.

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How it works

A starting point for discussion

Simple primary equity round: post-money = pre-money + investment. New investor ownership = investment / post-money. Each existing shareholder keeps their previous percentage multiplied by pre-money / post-money. Relative dilution is equal for existing holders; the percentage-point reduction depends on their original ownership.

The result organizes your answers and the stated assumptions. Reviewing your situation may require additional information and analysis.

Reference sources

References reviewed: 2026-10-09

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