What is pre-money valuation?
The pre-money valuation calculator above works backward from the terms of a deal — the investment amount and the equity stake handed to the investor — to reveal what the company is being valued at, both before and after the money comes in. Pre-money valuation is what a company is worth before new investment arrives. Post-money valuation is that figure plus the new investment. The distinction sounds academic, but it determines exactly how much of the company the investor ends up owning.
Founders and investors negotiate in different terms. An investor often thinks “I want 20% for my $1M.” A founder thinks “what’s my company worth?” These two framings are linked by a single equation, and confusing pre-money with post-money is one of the most common and expensive mistakes in early-stage deal-making — a few hundred thousand dollars of valuation can hinge on which number a casually-worded term sheet is referring to.
The formula
Post-money valuation = Investment / Investor's equity stake
Pre-money valuation = Post-money valuation − Investment- Investment — the new capital being raised.
- Investor’s equity stake — the percentage of the company the investor receives, always measured against the post-money valuation.
The reason post-money comes first in the math is subtle but important: the investor’s percentage is defined relative to the company after their money is in it. So you solve for post-money first, then subtract the investment to recover the pre-money figure.
Worked example
An investor puts in $1,000,000 for a 20% stake:
Post-money = $1,000,000 / 0.20 = $5,000,000
Pre-money = $5,000,000 − $1,000,000 = $4,000,000The company is valued at $4M pre-money and $5M post-money. The investor’s $1M buys exactly 20% of the $5M post-money company.
Now suppose you negotiate the investor down to a 15% stake for the same $1M:
Post-money = $1,000,000 / 0.15 = $6,666,667
Pre-money = $6,666,667 − $1,000,000 = $5,666,667Giving up 15% instead of 20% for the same cash implies a pre-money valuation nearly $1.7M higher. The equity percentage and the valuation are two sides of the same coin — every negotiation over “how much equity” is simultaneously a negotiation over valuation.
Benchmarks
There is no universal “correct” pre-money valuation — it depends on traction, team, market, and the funding climate. But some rough reference points for priced rounds:
- Seed rounds historically price in a wide band, often $3M–$15M pre-money, depending on traction and geography.
- Series A pre-money valuations commonly range from $15M–$50M+, again highly dependent on growth metrics.
- Across rounds, investors typically target 15–25% ownership, which — combined with the size of the raise — implicitly sets the valuation.
The relationship runs both ways: if you know how much you want to raise and how much dilution you will accept, you can solve for the minimum pre-money valuation you need to negotiate.
How to interpret and use it
The practical power of this calculator is in deal structuring. Before walking into a negotiation, decide how much you need to raise and the maximum dilution you will accept — then use those two numbers to derive the pre-money valuation you must hold the line on. This turns a vague negotiation (“what are we worth?”) into a concrete target.
Watch for two structural details the simple formula does not capture. First, an option pool created or expanded before the round is usually carved out of the pre-money valuation, which quietly lowers the effective pre-money and increases founder dilution. Second, convertible instruments (SAFEs and notes) from earlier do not have a stated valuation until they convert, and their conversion can shift the real pre-money meaningfully. For a clean priced round with no pool shuffle, the formula here is exact.
Finally, remember that a higher valuation is not free. Pricing a round aggressively can set a bar you must clear at the next round to avoid a “down round,” which is damaging to morale and to the cap table. The right valuation is one you can grow into, not just the highest number an investor will accept today.
Frequently asked questions
What is the difference between pre-money and post-money valuation? Pre-money valuation is what a company is worth before new investment comes in. Post-money valuation is the pre-money valuation plus the new investment. The investor’s ownership stake is calculated against the post-money figure.
How is pre-money valuation calculated here? Post-money valuation equals the investment divided by the investor’s equity stake (as a decimal). Pre-money valuation is then the post-money valuation minus the investment amount.