Model your post-money SAFEs

Enter your cap table and your SAFEs, and see what each SAFE owns before a priced round and at one. The arithmetic follows Y Combinator's post-money SAFE. Clauseworthy is not a law firm and does not give legal advice.

Your numbers

Cap table and SAFEs

Shares before any SAFE converts, then each SAFE in the order it was signed.

Jump to the result
Cap table today
SAFEs

A cap and a discount together are modelled, though YC no longer publishes that form.

A priced round (optional)

Result

What the SAFEs own

Enter a cap table and at least one SAFE.

The market, for scale.

Figures from Carta's data on SAFEs issued on its platform, cited with their dates. They describe other companies' rounds, not what yours should be.

  • 91% of SAFEs on Carta were post-money

    Carta, 2026-Q2

  • 73% of post-money SAFEs had a cap and no discount; 21% had both

    Carta, 2026-H1

  • 93% of pre-seed rounds were SAFEs

    Carta, 2026-Q2

What this does not do

  • It does not generate or edit a SAFE; YC's forms are linked above.
  • It does not model pro rata side letters separately: their purchases sit inside the new money you enter.
  • It does not say whether a cap, a discount or a round is fair.

Questions about the SAFE workspace

Does this generate a SAFE?

No. Y Combinator publishes the official forms and runs a free tool that fills one in and sends it for signature. This page models the numbers; use YC's forms or tool for the document.

Why do post-money SAFEs not dilute each other?

Each capped post-money SAFE owns its amount divided by its cap, measured after all the SAFEs convert. The dilution falls on the holders who were there before the SAFEs, which is usually the founders.

Is the model exact?

It follows the definitions in YC's post-money SAFE and states its rounding. A real round's documents, pool and side letters decide the actual numbers, so treat this as arithmetic to check, not a closing schedule.