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Convertible Note Calculator

Calculate how many shares a convertible note converts into at a future priced round, using accrued interest and whichever of the discount or valuation cap is more favorable to the investor.

How to Use Convertible Note Calculator
  1. 1Enter the note principal, interest rate, and months outstanding
  2. 2Enter the conversion discount % and valuation cap
  3. 3Enter the priced round's price per share and pre-money valuation
  4. 4Click Calculate to see the conversion price used and shares received
Frequently Asked Questions

The tool computes a conversion price both ways — applying the discount % to the round's price per share, and separately implying a price from the valuation cap relative to the round's pre-money — then uses whichever price is LOWER, since a lower conversion price gives the investor more shares. This is standard convertible note mechanics.

A convertible note is a debt instrument that accrues interest over time (added to principal before conversion); a SAFE (Simple Agreement for Future Equity) is not debt and accrues no interest. Both use the same discount-vs-cap conversion logic once you have an amount to convert.

You need a hypothetical or actual future round's price per share and pre-money valuation to run this calculation — it estimates what WOULD happen at conversion, not a valuation of the note today.

No — it only computes the conversion mechanics (interest accrual + discount/cap), not maturity date handling, which is a separate term in the actual note agreement.

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