SAFE Conversion Calculator

Model how a single SAFE converts into equity in a priced round using a valuation cap, discount, or both. See the SAFE holder's post-money ownership, effective valuation basis, and implied discount versus the round price.

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SAFE uses the more favorable of the valuation cap and the discount-versus-round price when computing its conversion price.
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Results

  • Post-money valuation (including SAFE) $
  • SAFE holder post-money ownership %
  • Effective valuation used for SAFE $
  • Effective discount vs round price %
  • Conversion basis
  • Status

What is a SAFE Conversion Calculator?

A SAFE conversion models how a Simple Agreement for Future Equity turns into shares at the next priced round by applying the valuation cap, the discount rate, or whichever produces the lower effective conversion price (better for the investor).

It matters because SAFE terms change your post-money outcome and fully diluted share count, which directly reshapes ownership and founder dilution once the round closes. The same math also determines the implied price per share and new shares issued, which you’ll want to sanity-check inside a cap table and against the round’s pre-money vs post-money valuation.

If your SAFE is post-money (common in modern SAFEs), the conversion can also interact with option pool decisions—so it’s useful to pressure-test dilution under different pool sizes and refresh scenarios using an option pool / ESOP view of the cap table. And if you’re planning an exit, the share count you create here carries through to payout economics—so it’s worth pairing with an exit proceeds or dilution check to see what founders and investors actually walk away with across scenarios.

Tip: if you’re comparing multiple SAFEs, model each one separately, then roll the totals into the cap table to avoid “stacked SAFE” dilution surprises.

Formula








Example

Inputs (priced round + SAFE):

  • Priced round pre-money valuation: $20,000,000
  • New equity round investment: $5,000,000
  • SAFE investment amount: $1,000,000

Scenario A — Valuation cap only (cap = $10,000,000):

  • Effective valuation used for SAFE: $10,000,000
  • Effective discount vs round price: 50%
  • SAFE holder post-money ownership: 7.41%
  • Post-money valuation (including SAFE): $27,000,000
  • Conversion basis: Lower of valuation cap and round price

Scenario B — Discount only (discount = 20%):

  • Effective valuation used for SAFE: $16,000,000
  • Effective discount vs round price: 20%
  • SAFE holder post-money ownership: 4.76%
  • Post-money valuation (including SAFE): $26,250,000
  • Conversion basis: Discount to round price

Scenario C — Cap and discount (cap = $10,000,000, discount = 20%):

  • Effective valuation used for SAFE: $10,000,000 (better of cap and discount)
  • Effective discount vs round price: 50%
  • SAFE holder post-money ownership: 7.41%
  • Post-money valuation (including SAFE): $27,000,000
  • Conversion basis: Better of cap and discount (cap chosen)

How to Use the SAFE Conversion Calculator

Enter the priced round terms, your SAFE terms (cap and/or discount), and the new equity investment size to see the SAFE’s implied ownership and conversion basis.

  1. Enter the priced round valuation

    • Set Priced round pre-money valuation to the round’s negotiated pre-money number.

  2. Enter the investment amounts

      • Fill SAFE investment amount (the SAFE’s principal).

    - Fill New equity round investment (the new money coming in at the priced round).

  3. Choose the SAFE structure

      • Pick Valuation cap only, Discount only, or Cap and discount (better of).

    - Then enter the relevant term(s): Valuation cap and/or Discount to round price.

    formula (effective valuation):

    - Cap only: effective_valuation = min(valuation_cap, round_pre_money)

    - Discount only: effective_valuation = round_pre_money × (1 − discount%)

    - Cap + discount: effective_valuation = min(valuation_cap, round_pre_money × (1 − discount%))

  4. Read the ownership and pricing outputs

      • SAFE holder post-money ownership shows the SAFE’s implied % after the priced round (including the new equity and the SAFE conversion shares).

    - Effective valuation used for SAFE tells you what the SAFE effectively converted at.

    - Effective discount vs round price translates the chosen basis into an “apples-to-apples” discount versus the priced round price.

    - Conversion basis explains why that pricing was chosen (cap, discount, round price, or better-of).

  5. Compare outcomes with scenarios

    • Use Scenarios to quickly test different caps/discounts/round sizes and see how sensitive dilution is before sharing or embedding the result.

Frequently Asked Questions

Methodology & Sources

Bibliography

  1. (2023). Post-Money SAFE User Guide (Website User Guide Feb 2023 – final) — Y Combinator
    Accessed 2025-12-22
  2. (2023). The University of Chicago Simple Agreement for Future Equity: An Explanation of Terms (As Revised October 31, 2023) — The University of Chicago (Polsky Center for Entrepreneurship and Innovation)
    Accessed 2025-12-22
  3. (2025). What You Should Know About SAFEs — Cooley GO
    Accessed 2025-12-22

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