An uncapped SAFE has no valuation cap, so it converts at the priced round's own price — minus any discount. That sounds founder-friendly, and often it is. But it has one uncomfortable property: you cannot know its dilution until you set a valuation you haven't set yet. It's a blank in your model until the round prices. Here's how to reason about it anyway.
With no cap, there's nothing to compare the round price against — the SAFE simply rides the round:
discount-only: conversion price = round price × (1 − discount) no cap, no discount: conversion price = round price (no benefit at all)The key consequence: the SAFE's ownership percentage is not fixed at signing the way a capped post-money SAFE's is. It depends entirely on the round price, which depends on the pre-money you negotiate later. A strong round means the SAFE buys fewer, more expensive shares; a weak round means it buys many cheap ones.
Take the same $500,000 SAFE with a 20% discount and no cap, against 8,000,000 founder shares, and price the round two ways.
| Round | Round price | SAFE price (−20%) | SAFE shares | SAFE % |
|---|---|---|---|---|
| Strong: $12M pre, $3M in | $1.50 | $1.20 | 416,667 | 4.0% |
| Weak: $3M pre, $1M in | $0.375 | $0.30 | 1,666,667 | 13.5% |
An uncapped SAFE with an MFN clause is the worst of both worlds for a founder. It starts uncapped — no protection for you — but the MFN means the moment you issue a capped SAFE later, this one inherits that cap. So it converts to "no cap" only if you never sign anything cheaper; the instant you do, it silently adopts your best cap. You've written an option that you fund. See the MFN guide for the backflow math.
The report converts every uncapped or discount-only SAFE across the bear / base / bull rounds you're weighing — and flags it on the warning map, with the MFN interaction called out.
Try the free estimate Get the report — $390