Pre-Money vs Post-Money Valuation: Formulas and Examples

Pre-money valuation is what your company is worth immediately before new money comes in; post-money valuation is what it is worth immediately after, which is simply the pre-money valuation plus the investment. The difference matters because the investor's ownership is calculated on the post-money figure: an investor putting €1 million into a company at a €4 million pre-money valuation owns 20%, not 25%. Confusing the two is one of the most common and costly mistakes in a first term sheet.

The core formulas

Three equations cover almost every early-stage calculation:

What you want	Formula
Post-money valuation	Pre-money valuation + Investment
Investor ownership	Investment ÷ Post-money valuation
Pre-money valuation	Post-money valuation − Investment
Price per share	Pre-money valuation ÷ Pre-money fully diluted shares
New shares issued	Investment ÷ Price per share

"Fully diluted" means counting every share that exists or could exist: common shares, preferred shares, issued options, the unissued option pool and, depending on the agreement, convertible instruments that will convert in the round. Using a smaller share count makes the price per share look higher than it really is.

If you want to skip the arithmetic, the post-money valuation calculator does both directions: from pre-money and investment to post-money, or from an offer of "€X for Y%" back to the implied valuations.

Worked example 1: a simple priced round

A startup has 1,000,000 shares, all held by two founders. An investor offers €800,000 at a €3.2 million pre-money valuation.

1. Post-money valuation = €3.2M + €0.8M = €4.0M
2. Investor ownership = €0.8M ÷ €4.0M = 20%
3. Price per share = €3.2M ÷ 1,000,000 = €3.20
4. New shares = €800,000 ÷ €3.20 = 250,000 shares
5. Total shares after the round = 1,250,000

Check: 250,000 ÷ 1,250,000 = 20%. The founders move from 100% to 80% together.

Worked example 2: reading an offer stated as a percentage

Investors often phrase an offer as "€500,000 for 20%". That sentence fixes the post-money valuation, not the pre-money.

• Post-money = €500,000 ÷ 20% = €2.5M
• Pre-money = €2.5M − €0.5M = €2.0M

Founders sometimes hear "20%" and calculate the valuation as €500,000 ÷ 20% = €2.5M, then think of that as the value of their company before the money. It is not. The company is being valued at €2.0M; the €2.5M already includes the investor's cash.

Why the distinction is so important

Consider two offers that sound almost identical:

Offer	Pre-money	Investment	Post-money	Investor ownership
A: "€1M at €5M pre"	€5.0M	€1.0M	€6.0M	16.7%
B: "€1M at €5M post"	€4.0M	€1.0M	€5.0M	20.0%

The difference is more than three percentage points of the company for the same cheque. On a future exit, that gap could be worth a lot. When someone quotes a valuation, always ask: "Is that pre-money or post-money?"

The option pool and the "effective" pre-money valuation

Most priced rounds include an employee option pool, a block of shares reserved for future hires. The key question is when it is created.

• Pool in the pre-money ("option pool shuffle"): the pool is created before the investment, so only existing shareholders are diluted by it. This is a common investor request.
• Pool in the post-money: the pool is created after the round, so investors share the dilution.

Example: same headline, different outcome

An investor offers €1M at a €4M pre-money valuation and asks for a 10% option pool in the post-money capitalisation, created before the round.

• Post-money: €5M. Investor: €1M ÷ €5M = 20%.
• Pool: 10% of the post-money company, i.e. worth €500,000 at the round price.
• Founders: 100% − 20% − 10% = 70%.

Because the pool is carved out of the pre-money, the founders' shares are effectively valued at €4M − €0.5M = €3.5M. That is sometimes called the effective pre-money valuation. A competing offer of €1M at €3.6M pre-money with no new pool would leave the founders with about 78.3%, which is more for them right after the round despite the lower headline number. The comparison is not perfectly fair, because that company would still need to create a pool later, but then the dilution would be shared with the new investor.

The employee option pool article covers how to size a pool, and the funding dilution calculator lets you model pool top-ups across several rounds.

What drives the pre-money valuation at an early stage

The formulas tell you how to calculate with a valuation, not where the number comes from. At pre-seed and seed there are usually no profits to discount, so the pre-money valuation is mostly a negotiated figure. The factors that tend to move it:

• Evidence of demand: revenue, growth rate, retention and engaged users reduce risk for the investor.
• Team: relevant experience and a track record of shipping make execution risk look lower.
• Market size and timing: a credible path to a large market supports a higher number.
• Competition between investors: several interested parties is the most direct way to improve terms.
• The amount raised: investors often think in terms of the percentage they want to own, so the amount you need and the valuation are linked.
• The wider funding climate: the same company can be valued very differently in a tight or a loose market.

Because the number is negotiated, prepare a range rather than a single figure, and know in advance what each point in that range means for your ownership after the round.

How convertible instruments affect the calculation

SAFEs and convertible notes do not set a valuation when they are signed. They convert into shares at a later priced round, usually based on a valuation cap and or a discount. When they convert, they add shares, and the term sheet decides whether those shares count in the pre-money share count.

Two practical points:

• Pre-money SAFEs convert in a way that dilutes everyone, including the new investor, proportionally. Post-money SAFEs fix the SAFE holder's percentage based on the cap, so additional SAFEs dilute the founders, not earlier SAFE holders.
• If several convertible instruments are outstanding, the founders' real ownership after the priced round can be noticeably lower than the headline valuation suggests.

SAFE vs convertible note explains these mechanics in detail.

Step by step: evaluating a valuation offer

1. Write down the pre-money valuation and the investment amount. If only one valuation is mentioned, ask whether it is pre or post.
2. Calculate the post-money valuation and the investor's ownership percentage.
3. Check the option pool. Is a new pool or top-up required? Is it in the pre-money? What percentage of the post-money company?
4. List outstanding convertibles and model how they convert in this round.
5. Compute your fully diluted ownership after the round. That is the number that matters to you, not the headline valuation.
6. Look at the other economic terms. Liquidation preference, participation and anti-dilution provisions change what your ownership is worth in different exit scenarios.
7. Compare offers on the same basis. Put them side by side using effective pre-money valuation and post-round founder ownership.

Common mistakes

Treating post-money as pre-money. As the table above shows, this misunderstanding can cost several percentage points of ownership for the same investment.

Ignoring the pool shuffle. A higher headline pre-money valuation with a large pool carved out can be worth less to the founders than a lower one without it.

Using an outdated share count. Forgetting issued options, warrants or convertibles makes the price per share look better than it is.

Anchoring only on valuation. A clean term sheet at a moderate valuation can be better than an aggressive valuation with heavy preferences or broad investor vetoes. A high valuation also sets the bar for the next round; if you cannot grow into it, a later down round can be painful.

Not modelling the next rounds. One round of dilution is easy to understand. Three rounds with pool top-ups are not. Run the scenario before you sign.

Quick reference checklist

• Valuation confirmed as pre-money or post-money in writing
• Post-money valuation and investor percentage calculated
• Option pool size and timing (pre or post) clarified
• Convertible instruments and their conversion modelled
• Fully diluted share count verified with your cap table
• Founder ownership after the round calculated
• Other economic terms reviewed with a lawyer

How this fits into your fundraise

Valuation is one part of a bigger negotiation. To decide what range is reasonable for your stage and how much of the company to sell, read how much equity to give up in a seed round. For the full process from preparation to closing, see the startup fundraising guide.

This article is general information, not legal, tax or investment advice. Share issuance, valuation and tax rules differ by country, so involve a qualified lawyer and tax adviser before you sign a term sheet.