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Investor Ownership Percentage Calculator

Work out investor ownership percentage instantly with clear inputs, formula shown and shareable results.

About Investor Ownership Percentage Calculator

Investor ownership is the investment divided by the post-money valuation. A new option pool created inside the pre-money valuation dilutes existing holders only, so it must be deducted from their side of the table rather than shared with the incoming investor.

Formulas

Investor ownership

Ownership % = Investment / (Pre-money + Investment) x 100

Pool share

Pool % of post-money = Pool % x Pre-money / Post-money

Worked example

With the default values below, Investor Ownership Percentage Calculator returns Investor ownership of 16.667%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Investment amount
1,500,000
Pre-money valuation
7,500,000
New option pool created pre-money
10

Results

Investor ownership
16.667%
Post-money valuation
$9,000,000.00
Option pool share of post-money equity
8.333%
Remaining founder and existing holder share
75.000%

Step by step

  1. 1Values used
  2. 2Investor ownership
  3. 3Pool share
  4. 4Investor ownership= 16.667
  5. 5Post-money valuation= 9,000,000.00
  6. 6Option pool share of post-money equity= 8.333
  7. 7Remaining founder and existing holder share= 75.000

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does the pool reduce founder ownership and not the investor's?

Because it is carved out of the pre-money valuation, before the new money arrives. This is standard and heavily negotiated.

Does a larger round always mean more dilution?

At a fixed valuation, yes. Raising more at a higher valuation can be less dilutive per dollar, which is the point of building traction first.

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