Post-Money Valuation Calculator
Work out a startup's post-money valuation, investor ownership and founder dilution from a pre-money valuation and investment — or reverse it to find the implied valuation from an ownership stake.
Written and reviewed by the CalcBundle editorial team. Transparent formulas · results are estimates, not advice.
Post-money valuation
Enter the pre-money valuation and the investment amount (both greater than zero).
What is a post-money valuation calculator?
When a startup raises money, two valuations matter: the pre-money value (before the investment) and the post-money value (immediately after). This calculator computes post-money valuation, the investor’s ownership stake and the resulting founder dilution — and can work in reverse from an agreed ownership percentage.
The formulas
- Post-money = Pre-money + Investment
- Investor ownership % = Investment ÷ Post-money × 100
- Founder ownership % = 100 − Investor ownership %
- Reverse: Post-money = Investment ÷ Investor ownership %; Pre-money = Post-money − Investment
Pre-money vs post-money
The distinction matters because ownership is calculated on the post-money figure. A “$4M valuation” means very different things pre- and post-money for a $1M round: at $4M pre-money the investor gets 20% ($1M of $5M), but at $4M post-money they get 25% ($1M of $4M).
Example
A $4M pre-money valuation with a $1M investment gives a $5M post-money valuation. The investor owns 20% and founders retain 80%.
Founder dilution
Each round issues new shares, reducing existing owners’ percentages. This calculator models a single round; real cap tables also involve option pools, SAFEs, convertible notes and multiple rounds, all of which add dilution. Treat the output as an illustrative starting point.
Related calculators
Estimate the valuation itself with the startup valuation calculator, and for established companies the company valuation and business valuation calculators.
Frequently asked questions
What is post-money valuation?
Post-money valuation is a company's value immediately after it receives an investment. It equals the pre-money valuation plus the new investment amount.
What is the difference between pre-money and post-money?
Pre-money is the company's value before the investment. Post-money is the value straight after: post-money = pre-money + investment. The investor's ownership is based on the post-money figure.
How do you calculate investor ownership?
Investor ownership % = investment ÷ post-money valuation × 100. For example, a $1M investment at a $5M post-money valuation buys 20% of the company. Founders retain the remaining 80%.
How does funding dilute founders?
Issuing new shares to an investor increases the total shares, so existing owners hold a smaller percentage. A $1M round at $4M pre-money dilutes founders from 100% to 80%. This calculator shows a single round; option pools and multiple rounds add further dilution.
Related calculators
Startup Valuation
Estimate a startup's indicative value from ARR, revenue, growth and churn.
Company Valuation
Estimate an established company's value with revenue, EBITDA and SDE multiples.
Business Valuation
Estimate your company's value with revenue, EBITDA and SDE multiples, adjusted for growth and risk.
Disclaimer. This calculator provides estimates for informational purposes only. Results are based on the information you enter and the assumptions used by the calculator. Actual financial, tax, business valuation, lending, marketplace or investment outcomes may differ. Consider consulting a qualified professional for decisions involving significant amounts of money. Ownership and valuation calculations are illustrative and do not account for all legal, financing, option-pool or dilution considerations.