Safe Note Conversion Calculator

Background.

Safe Note Conversion Calculator supports a concrete decision: use it to compare discount and valuation-cap prices and issue shares at the lower conversion price. The result needs one precise interpretation: a SAFE is a contractual right to future equity rather than debt; the selected YC-style cap-and-discount model has no interest or maturity. The selected relationship is “conversion price = min(new-round price × (1 − discount), valuation cap ÷ company capitalization); shares = investment ÷ conversion price.”

The editable entries are safe purchase amount, new-money price per share, safe discount, valuation cap, company capitalization used by safe. Use values from the document or measurement that governs this safe note conversion question; the defaults are only the worked fixture below. Post-money and pre-money SAFE forms allocate dilution differently, so use only the capitalization definition in the signed instrument. The safe note conversion calculation does not infer that fact from the other entries.

Y Combinator, SAFE Financing Documents; post-money SAFE definitions and forms documents the convention or governing rule used here. The safe note conversion output is a transparent scenario under those facts: it does not manufacture an unentered market price, professional determination, carrier quote, legal eligibility finding or locally adopted code value.

What is safe note conversion calculator?

Safe Note Conversion is the relationship behind this decision: a SAFE is a contractual right to future equity rather than debt; the selected YC-style cap-and-discount model has no interest or maturity. On this page it means conversion price = min(new-round price × (1 − discount), valuation cap ÷ company capitalization); shares = investment ÷ conversion price. Post-money and pre-money SAFE forms allocate dilution differently, so use only the capitalization definition in the signed instrument; that is the line between the reported quantity and a broader corporate finance analysis.

How to use this calculator.

1. 01Confirm that “conversion price = min(new-round price × (1 − discount), valuation cap ÷ company capitalization); shares = investment ÷ conversion price” matches the safe note conversion convention you need.
2. 02Replace the fixture values for safe purchase amount, new-money price per share, safe discount, valuation cap, company capitalization used by safe with dated values from the governing record.
3. 03Keep all currencies, measurement units and time periods on the same basis before calculating.
4. 04Read safe conversion shares together with this boundary: Post-money and pre-money SAFE forms allocate dilution differently, so use only the capitalization definition in the signed instrument.

The formula.

The calculation uses conversion price = min(new-round price × (1 − discount), valuation cap ÷ company capitalization); shares = investment ÷ conversion price. In this safe note conversion model, the entered terms are safe purchase amount, new-money price per share, safe discount, valuation cap, company capitalization used by safe. A SAFE is a contractual right to future equity rather than debt; the selected YC-style cap-and-discount model has no interest or maturity, which is why the relationship is presented under this name rather than as a universal alternative. Post-money and pre-money SAFE forms allocate dilution differently, so use only the capitalization definition in the signed instrument. Calculations keep full decimal precision through the relationship and round only the returned display values.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Y Combinator, SAFE Financing Documents; post-money SAFE definitions and forms. Retrieved 2026-08-07. access: open unless marked otherwise.
2. [2]U.S. Securities and Exchange Commission. Investor.gov glossary: Convertible securities. Retrieved 2026-08-07. independence: primary; access: open.
3. [3]U.S. Securities and Exchange Commission. Investor.gov glossary: Dilution. Retrieved 2026-08-07. independence: primary; access: open.
4. [4]U.S. Securities and Exchange Commission. Investor.gov glossary: Preferred stock. Retrieved 2026-08-07. independence: primary; access: open.
5. [5]Feld, B., & Mendelson, J. Venture Deals: Be Smarter Than Your Lawyer and Venture Capitalist, 4th ed. Wiley. Convertible instrument mechanics. independence: secondary-check; access: print. (PRINT)