#907 · Startup Tool

Pre Money Valuation Calculator

Estimate the pre-money valuation implied by a proposed investment and target investor ownership. The tool shows pre-money value, post-money value, and founder dilution.

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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.

Post Money = Investment / Investor Ownership; Pre Money = Post Money - Investment

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 a $1,000,000 investment buys 20%, post-money valuation is $5,000,000 and pre-money valuation is $4,000,000.

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 do I calculate pre-money valuation from investment and ownership?

Divide the investment amount by the investor ownership percentage to get post-money valuation, then subtract the investment to get pre-money valuation.

What pre-money valuation should I ask for in a seed round?

The right pre-money valuation depends on traction, market, team, revenue, comparable rounds, and how much dilution you can accept.

How does pre-money valuation affect founder dilution?

A higher pre-money valuation reduces the ownership percentage investors receive for the same investment amount.

Is pre-money valuation before or after the option pool?

Many term sheets calculate the option pool on a pre-money basis, which can shift dilution toward founders.

Can I calculate share price from pre-money valuation?

Yes. Divide pre-money valuation by the existing fully diluted share count to estimate the implied share price before new investment.

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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