Pre and Post Money Valuation Calculator
Calculate a startup's pre-money and post-money valuation based on investment amount and ownership percentage.
What Is Pre-Money and Post-Money Valuation?
Pre-money valuation is the value of a startup before it receives a new investment. Post-money valuation is the value immediately after the investment is made. The difference between the two is simply the amount of capital invested.
These two figures are fundamental to understanding how much ownership an investor receives in exchange for their capital. The relationship is straightforward: post-money valuation equals pre-money valuation plus the investment amount. The investor's ownership percentage is determined by dividing their investment by the post-money valuation.
How the Valuation Calculation Works
This calculator uses two core formulas depending on which variable you need to solve for:
Calculating Valuation from Investment and Ownership:
If you know how much an investor is putting in and what percentage they receive, the post-money valuation is the investment amount divided by the ownership percentage. Pre-money valuation is then the post-money valuation minus the investment.
Calculating Ownership from Valuation and Investment:
If you know the pre-money valuation and the investment amount, the post-money valuation is the sum of the two. The investor's ownership percentage is the investment divided by the post-money valuation.
The calculator assumes a standard single-round investment structure with no complicating factors like convertible notes, option pools, or multiple investors with different terms.
How to Use the Calculator
Enter any two of the three variables — investment amount, pre-money valuation, or ownership percentage — and the calculator will determine the missing value. The inputs are:
- Investment Amount: The capital the investor is contributing to the startup.
- Pre-Money Valuation: The startup's value before the investment is made.
- Ownership Percentage: The equity stake the investor receives in exchange for their investment.
Enter values in two of the three fields. The third field will be calculated automatically. All monetary values should be entered in the same currency.
Example Scenario
A startup is raising a seed round. An investor agrees to invest $500,000 in exchange for a 20% ownership stake.
To find the valuations, enter $500,000 as the investment amount and 20% as the ownership percentage. The calculator determines:
- Post-Money Valuation: $2,500,000 ($500,000 ÷ 0.20)
- Pre-Money Valuation: $2,000,000 ($2,500,000 - $500,000)
This means the startup was valued at $2 million before the investment, and the investor's $500,000 brings the total company value to $2.5 million.
Understanding Your Results
The pre-money and post-money valuations are critical reference points for both founders and investors. They establish the baseline for the current round and set expectations for future funding rounds.
Keep in mind that these calculations assume a clean, simple round. In practice, startup valuations are influenced by market conditions, revenue, traction, team quality, and comparable deals. The calculator provides the mathematical relationship between investment, ownership, and valuation — it does not determine what a fair valuation should be.
Common Mistakes in Valuation Calculations
Confusing pre-money and post-money: A common error is treating the pre-money valuation as the value after the investment. Always remember that pre-money is before the money comes in, and post-money is after.
Ignoring the option pool: Many funding rounds include an employee stock option pool that is created or expanded as part of the deal. This dilutes the founders' ownership and affects the effective valuation. This calculator does not account for option pools.
Using inconsistent units: Ensure all monetary values are in the same currency and that the ownership percentage is entered as a whole number (e.g., 20 for 20%), not a decimal.
Practical Use Cases
Founders preparing for a raise: Understand what ownership stake an investor will receive at a given valuation, or determine what valuation is implied by a specific investment and ownership offer.
Investors evaluating deal terms: Quickly verify that the ownership percentage aligns with the proposed valuation and investment amount.
Comparing funding offers: When a startup receives multiple term sheets with different combinations of valuation and investment amount, this calculator helps normalize the terms for comparison.
Cap table modeling: Use the calculated valuations as inputs for more detailed cap table projections that account for multiple rounds and dilution.
FAQ
What is the difference between pre-money and post-money valuation?
Pre-money valuation is the company's value before receiving a new investment. Post-money valuation is the value after the investment is added. The post-money valuation is always the pre-money valuation plus the investment amount.
Why does post-money valuation matter?
Post-money valuation determines the investor's ownership percentage. It also sets the baseline for the next funding round. A higher post-money valuation means less dilution for existing shareholders when future investments are raised.
Can I use this calculator for SAFE notes or convertible notes?
This calculator is designed for standard priced equity rounds. SAFE notes and convertible notes convert into equity at a future date, often with valuation caps or discounts, making the calculation more complex. This tool does not account for those structures.
What if I only know the investment amount and post-money valuation?
Enter the investment amount and post-money valuation. The calculator will determine the pre-money valuation (post-money minus investment) and the ownership percentage (investment divided by post-money).
Does this calculator account for dilution from future rounds?
No. This calculator only models a single funding round. Future dilution from subsequent investment rounds, option pool expansions, or other equity issuances is not included.