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Equity Dilution Calculator

Last updated: April 2026

Current Shareholders

50.00%

50.00%

Funding Round

£
£

New option pool created as part of this round, diluting existing shareholders before the investor comes in.

%

Post-money valuation: £2,500,000

Investor receives: 20.00%

Round Summary

Pre-money valuation£2,000,000
Investment£500,000
Post-money valuation£2,500,000
Price per share£2.00
New shares issued250,000
Option pool created100,000 (10.00%)
Total shares after1,350,000

Cap Table

ShareholderBeforeAfterDilution
Founder 150.00%37.04%-12.96%
Founder 250.00%37.04%-12.96%
Option pool-7.41%new
Investor-18.52%new

Before

Founder 150.00%
Founder 250.00%

After

Founder 137.04%
Founder 237.04%
Option pool7.41%
Investor18.52%

Founder value

Founder 1's shares are worth:

At pre-money

£1,000,000

At post-money

£1,000,000

Paper value only - not realised cash.

What is equity dilution?

Equity dilution occurs when a company issues new shares, reducing the percentage ownership of existing shareholders. When you raise investment, you create new shares for the investor. Your percentage falls even though you own the same number of shares. The goal is for dilution to be offset by an increase in the value of your remaining shares.

What is pre-money and post-money valuation?

Pre-money valuation is what the company is worth before the investment. Post-money valuation is pre-money plus the investment amount. If your company is valued at £2m pre-money and you raise £500k, the post-money valuation is £2.5m and the investor owns 20%.

What is an option pool?

An option pool is a block of shares set aside for future employees and advisers. Investors often require an option pool to be created before their investment, which means existing founders bear the dilution of creating it. A 10-15% option pool is typical for early-stage funding rounds.

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