#910 · Startup Tool

Option Pool Calculator

Plan an employee option pool and see how it affects founder and investor ownership. The tool estimates required option shares, hiring capacity, and option pool health.

Calculator

Startup inputs
shares
%
%
%
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How to use this calculator

  • Enter the financing or ownership assumptions for this startup scenario.
  • Use the calculator to estimate ownership, dilution, valuation, or conversion impact.
  • Review the health score and compare the result with normal fundraising ranges.
  • Use the result as a decision-support estimate before reviewing legal documents.

What the result means

The result shows the financing impact on ownership, valuation, conversion, or dilution. A stronger result protects founder ownership while preserving enough incentive for investors and employees.

Option Shares = Existing Shares × Pool % / (100 - Pool %)

This estimate is educational and should not replace legal, tax, or fundraising advice. Real term sheets may include preferences, pro rata rights, participation, vesting, and other provisions.

Example calculation

If 5,000,000 shares exist and the target pool is 15%, the company needs about 882,353 option shares on a fully diluted basis.

Tips for better results

  • Model conservative and aggressive cases before signing terms.
  • Review fully diluted ownership, not only headline ownership.
  • Check how the result affects future fundraising rounds.
  • Document assumptions clearly before discussing with investors.

FAQ

How big should a startup option pool be before fundraising?

Many startups plan option pools based on hiring needs, stage, and investor expectations. Early-stage pools often need enough capacity for key hires.

How do I calculate new shares needed for an option pool?

Use option shares = existing shares × target pool percentage / (100 - target pool percentage) to create a fully diluted target pool.

Does the option pool dilute founders or investors?

It depends on the term sheet. A pre-money option pool usually dilutes founders more than new investors.

What is a normal employee option pool percentage for startups?

A common planning range is roughly 10% to 20%, but the right size depends on hiring plan, stage, and compensation strategy.

How many employees can my option pool support?

Divide available option pool shares or percentage by expected grants for hires across executives, managers, and individual contributors.

Startup decision modules

ModuleWhat it shows
Main ResultPrimary startup finance output for this calculator.
Ownership ImpactHow the scenario changes equity or valuation.
Health ScorePractical quality score from the result.
Decision SignalRecommended action based on the result.

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