Formulas used
Post-money = pre-money + investment. Investor ownership = investment ÷ post-money. Price per share = pre-money ÷ fully diluted shares. Investor shares ≈ investment ÷ price per share.
Valuation calculator
Pre-Money / Post-Money Valuation Calculator
Enter a valuation and investment amount to estimate post-money valuation, investor ownership, price per share, and before/after ownership.
What the full valuation calculator models
Use this page when you already know a pre-money valuation and cash raise and need ownership plus share-price outputs. It connects dollar terms to an optional share base so you can estimate price per share and how many new shares the investor receives in a simplified priced round.
Ownership math still starts from post-money valuation = pre-money + investment. Price per share is pre-money valuation divided by pre-round fully diluted shares. New investor shares equal investment amount divided by that price per share in the simplified model.
Worked example: $10M pre-money, $2M raise, 5M FD shares
A $2,000,000 investment on a $10,000,000 pre-money valuation creates a $12,000,000 post-money valuation. Investor ownership is $2,000,000 ÷ $12,000,000 = 16.67%.
With 5,000,000 fully diluted shares before the round, price per share is $10,000,000 ÷ 5,000,000 = $2.00. Estimated new investor shares are $2,000,000 ÷ $2.00 = 1,000,000 shares. If founders hold 4,000,000 common shares and the pool holds 1,000,000 before the round, those blocks become smaller percentages of the larger post-money share count after the investor shares are issued.
Assumptions and limits
- Share fields are optional educational inputs, not a legal capitalization table.
- The model does not reorder convertibles, preference stacks, or warrants.
- Option-pool top-ups that change pre-money share count should be modeled on the Option Pool Calculator, then compared here.
Educational-use disclaimer: FounderMath is for educational planning only. It is not legal, tax, accounting, investment, securities, financial, or fundraising advice.
Quick percent-sold only?
If you do not need share outputs, use the simple calculator to sync ownership sold, raise, and post-money from pre-money.
Common mistake
Do not treat a post-money quote as pre-money. That swap changes ownership sold even when the cash raise looks the same.
Related tools
Valuation hub · Simple Pre/Post-Money Calculator · Pre-Money vs Post-Money · SAFE Conversion Calculator · Founder Dilution Calculator
FAQ
How is post-money valuation calculated here?
Post-money valuation equals pre-money valuation plus the investment amount. Investor ownership equals investment amount divided by that post-money valuation.
Why ask for fully diluted shares and founder shares?
Share counts let the calculator estimate price per share and new investor shares. Fully diluted shares set the pre-round share base; founder/common shares and option pool shares help show before/after ownership slices.
Is valuation the same as cash in the bank?
No. The investment amount is cash entering the company. Valuation is the negotiated company value used to price ownership in the round.
Does new investment dilute founders automatically?
Yes on a post-money percentage basis: new investor ownership reduces existing holder percentages. Exact share outcomes still depend on document terms and option-pool treatment.
How is this different from the simple calculator?
The simple calculator syncs only pre-money, ownership sold, raise, and post-money. This full calculator adds share-level outputs such as price per share and estimated investor shares.
Last reviewed September 7, 2026. See Methodology and Sources.