Pre-Money vs Post-Money Valuation: Which Number to Use and When
By Devon Coombs, CPA, MBA · Teaching Professor of Finance, Santa Clara University · Reviewed August 2026
Negotiate and quote the pre-money, because it sets the price of the company before new cash arrives and anchors the price per share. Compute ownership and dilution off the post-money, because investor ownership equals the investment divided by the post-money valuation. Post-money equals pre-money plus the investment, so the two numbers carry the same information and differ only in which denominator they feed.
| Pre-money valuation | Post-money valuation | |
|---|---|---|
| Definition | Company value before the new investment | Company value including the new investment |
| Identity | Post-money minus the investment | Pre-money plus the investment |
| What it sets | Price per share for the round | Investor ownership percentage |
| Ownership math | Pre-money ÷ fully diluted pre-round shares gives share price | Investment ÷ post-money gives the investor stake |
| Option pool treatment | Pre-money pool dilutes existing holders only | Post-money pool dilutes all holders pro rata |
| Quoting convention | The negotiated headline in most priced rounds | The basis for post-money SAFE caps and the VC method |
When Pre-money valuation is the right tool
The pre-money is the right number for negotiating headline price and for comparing a new round against the last one, since price per share equals the pre-money divided by fully diluted pre-round shares. It is the figure founders and investors argue over, because it prices the company the existing holders built. The pre-money is only as meaningful as what sits inside it. A term sheet that pairs a higher pre-money with a larger required option pool can leave founders with less than a lower headline number, since a pre-money pool is carved out of existing holders alone.
When Post-money valuation is the right tool
The post-money is the right denominator for every ownership and dilution calculation, since the investor's stake is the investment divided by the post-money and the cap table must sum to it. Post-money SAFE caps are quoted on it, and the venture capital method works backward from exit value to a post-money before any pre-money is computed. Board reporting and dilution planning generally run off the post-money on a fully diluted basis, because that is the base on which the next round's dilution compounds.
The common mistake
The recurring error is pricing dilution off the wrong denominator, most often quoting the raise over the pre-money instead of the investment over the post-money, which misstates what the founders are actually selling. A second version of the mistake compares competing term sheets on headline pre-money alone. Two identical pre-money figures with different required option pools produce different founder outcomes, because the pool expansion inside the pre-money is absorbed entirely by existing holders before the new investor buys in.
Work the numbers yourself
Both concepts are taught in depth, with practice questions, in the free Entrepreneurial Finance course.