Pre-Money / Post-Money Valuation Calculator
Enter your financing assumptions to estimate post-money valuation, investor ownership, dilution, and (optionally) share price math.
What this pre post money calculator helps you do
If you are raising startup capital, pre-money and post-money valuation are two of the most important numbers in your term sheet. This calculator gives you a fast way to understand how much of your company you are selling, what the implied valuation is after investment, and how dilution works for founders and existing shareholders.
It is useful for founders, angel investors, venture capital associates, startup employees evaluating option grants, and anyone learning venture financing basics.
Pre-money vs post-money: quick definitions
Pre-money valuation
Pre-money valuation is the value of the company before new capital is invested.
Post-money valuation
Post-money valuation is the value of the company after the new investment is added.
Post-money valuation = Pre-money valuation + New investment
Investor ownership % = New investment / Post-money valuation
Why these numbers matter
- Founders: See your dilution before you sign a term sheet.
- Investors: Confirm the ownership target tied to check size.
- Employees: Understand how your options may be diluted over time.
- Finance teams: Build cleaner cap table forecasts for future rounds.
Worked example
Suppose your startup has a pre-money valuation of $4,000,000 and raises $1,000,000.
- Post-money valuation = $5,000,000
- Investor ownership = $1,000,000 / $5,000,000 = 20%
- Existing holders retain 80% before any additional pool adjustments
If there are 8,000,000 existing shares, the implied price per share is $0.50 ($4,000,000 / 8,000,000), and the round issues 2,000,000 new shares for the investor.
Common mistakes founders make
1) Confusing valuation with cash in the bank
A $10M post-money valuation does not mean the company has $10M in cash. It means that the latest financing implies that valuation.
2) Ignoring option pool mechanics
Option pools can materially affect founder dilution. Depending on the deal, pool expansion may happen pre-money or post-money. Always model both scenarios during negotiations.
3) Skipping cap table planning
Even if this is your first round, think two rounds ahead. Small changes in early dilution compound later.
How to use this calculator in fundraising conversations
- Start with the valuation range you believe is reasonable.
- Test multiple investment amounts to see ownership outcomes.
- Run sensitivity checks for option pool percentages.
- Use outputs to prepare data-driven negotiation points.
Advanced note on option pools
The option pool field here uses a simple assumption: pool dilution comes from existing holders only, while investor ownership from cash investment remains constant. Real term sheets may define pool expansion differently. For legal and financial decisions, confirm structure with counsel and your finance lead.
FAQ
Is higher pre-money always better for founders?
Not always. A very high valuation can make future fundraising harder if growth does not support the step-up. Sustainable pricing often beats vanity pricing.
Can I use this for SAFE notes or convertible notes?
You can use it for rough intuition, but SAFEs and convertibles involve valuation caps, discounts, and conversion events that need more detailed modeling.
What is a “good” investor ownership percentage?
It depends on stage, risk, market conditions, and traction. Early seed rounds frequently land in broad ranges, but there is no one universal “correct” number.
Final takeaway
A strong understanding of pre-money and post-money valuation helps you negotiate from clarity instead of confusion. Use the calculator above to test scenarios quickly, then pressure-test assumptions with your full cap table model before finalizing any financing terms.