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Round mechanics guide
Most early rounds close on a SAFE; most Series As are priced. The switch happens for a concrete reason, and if you understand the dilution math behind each you'll negotiate the cap instead of accepting it. This guide walks the difference, then works a real example so you can see exactly how much of the company a SAFE hands over.
| Post-money SAFE | Priced round | |
|---|---|---|
| What it is | A promise to issue equity later, at a valuation cap and/or discount, when a priced round happens. | Actual preferred stock issued now at an agreed price per share. |
| Legal cost / speed | Low — a few pages, days to close, no board approval needed. | Higher — term sheet, definitive docs, legal on both sides, weeks. |
| When it dominates | Pre-seed and seed. 92% of pre-seed rounds use SAFEs; the standard is cap-only, no discount (61% of SAFEs). | Series A onward, where an institutional lead wants a board seat, a defined price, and protective provisions. |
| Dilution timing | Deferred — you don't feel it until conversion at the priced round, when all SAFEs convert at once. | Immediate and explicit — everyone sees the ownership table the day it closes. |
| Terms that matter | Valuation cap, discount, MFN, pro-rata. | Price, liquidation preference, option-pool refresh, board, protective provisions. |
Post-money SAFEs make this arithmetic clean by design — the cap is the post-money valuation the investor is buying into. So the ownership the SAFE converts to is simply the money in, divided by the cap.
That 10% is the floor — it assumes no discount and no other instruments. Add a second $500K SAFE at a $6M cap and that one alone converts to another 8.3% (0.5 ÷ 6.0), and now your two SAFEs have handed over ~18% before you've even priced the round. This is the median pre-seed reality: Carta's Q1 2026 data puts typical pre-seed dilution around 12.5%, and the standard instrument is a post-money SAFE with a cap near $10M for a $250K–$1M raise.
Post-money SAFE math: ownership = amount ÷ cap (the discount only bites if the next round prices below the cap, in which case the effective price is (1 − discount) × round price). This is a single-instrument estimate — stack multiple SAFEs and model the combined conversion. Illustrative, not legal or valuation advice.
You move from SAFEs to a priced round when three things line up: an institutional lead who wants a defined ownership stake and a board seat, a valuation you can defend with metrics (not just narrative), and enough SAFE overhang that another uncapped instrument would muddy the cap table. At US Series A, the round is almost always priced preferred stock — and this is where the "option-pool shuffle" appears: a refresh to ~15–20% post-money that dilutes founders pre-money, i.e. before the new investor's money lands.
| Stage | Typical instrument | Median dilution this round |
|---|---|---|
| Pre-seed | Post-money SAFE, cap-only | ~12.5% |
| Seed | Post-money SAFE or priced | ~19–20% |
| Series A | Priced (preferred) | ~18–19% |
| Series B | Priced (preferred) | ~13–14% |
Source: Carta State of Private Markets (Q4 2025 / Q1 2026). Carta's sample runs lower than the full market (it misses mega-rounds); verify the current quarter before quoting a number to an investor. These are medians — your terms depend on your metrics, your leverage, and the competitiveness of your round.
The calculator above handles one SAFE. Your real dilution is the compounded effect of every instrument plus each future round's median dilution — that's the ownership waterfall investors run. The RaiseReady report builds that waterfall from your actual stack, converts your SAFEs at three valuations, and shows what each 1.00 of your equity today becomes through Series B.
The $990 report converts your SAFEs at three valuations, shows the round-by-round ownership waterfall at Carta-median dilution, and flags where your stack changes the negotiation. Start with the free on-page readiness check.
Run the free readiness check →The post-money SAFE (YC's 2018 version) is now the standard, and it's what these numbers assume. Its advantage is transparency: the cap is the post-money valuation, so the investor's ownership is exactly amount ÷ cap and doesn't shift as other SAFEs are added. Pre-money SAFEs are largely legacy at this point.
Cap-only is the market standard — 61% of SAFEs — and it's the cleanest to model. A discount (usually 20% when used) rewards early investors if your priced round comes in above the cap. Both together is founder-unfriendly and increasingly rare at the earliest stages; don't offer it unless a specific investor requires it.
There's no hard rule, but once your stacked SAFEs would convert to more than roughly a fifth of the company, the cap table is complex enough that a priced round (which resolves everything into a clean ownership table) is usually cleaner for the next investor — and cleaner for you to defend in diligence.
Generally no — that's part of why it's fast. A priced round does: term sheet, board and shareholder approvals, and definitive documents. That speed difference is the main reason early rounds default to SAFEs. This is general information, not legal advice — confirm with your counsel for your specific structure.
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