Pro Rata Investment Calculator

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Pro Rata Investment Calculator

Investment Requirement

$0.00

function calculateProRata() { var ownership = parseFloat(document.getElementById('currentOwnership').value); var roundSize = parseFloat(document.getElementById('newRoundSize').value); var resultDiv = document.getElementById('proRataResult'); var amountDisplay = document.getElementById('investmentAmount'); var explanation = document.getElementById('explanationText'); if (isNaN(ownership) || isNaN(roundSize) || ownership <= 0 || roundSize 100) { alert('Ownership cannot exceed 100%.'); return; } var investmentRequired = (ownership / 100) * roundSize; amountDisplay.innerHTML = '$' + investmentRequired.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); explanation.innerHTML = 'To maintain your ' + ownership + '% ownership stake in a $' + roundSize.toLocaleString() + ' round, you need to invest $' + investmentRequired.toLocaleString() + '.'; resultDiv.style.display = 'block'; }

Understanding Pro Rata Investment Rights

Pro rata rights (also known as participation rights) give an investor the option to participate in subsequent funding rounds to maintain their percentage ownership in a company. Without these rights, an investor's stake is "diluted" when the company issues new shares to new investors.

The Pro Rata Formula

Pro Rata Investment = Current Ownership % × Total New Funding Round Amount

Why Investors Use Pro Rata Rights

  • Anti-Dilution: It prevents your ownership from shrinking as the company grows and raises more capital.
  • Concentration: It allows successful investors to double down on their "winners" in Series A, B, and beyond.
  • Governance: Maintaining a certain percentage may be required to keep a board seat or voting rights.

Practical Example

Suppose an Angel Investor owns 2% of a startup after the Seed round. The company decides to raise a Series A round of $5,000,000. To calculate their pro rata contribution:

  • Ownership: 2% (0.02)
  • Round Size: $5,000,000
  • Calculation: 0.02 × $5,000,000 = $100,000

By investing an additional $100,000 in the Series A round, the investor maintains their 2% equity position in the company.

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