Core formulas
Post-money = pre-money + raise. Ownership sold = raise ÷ post-money. Raise = post-money − pre-money.
Simple valuation calculator
Simple Pre-Money / Post-Money Calculator
Enter pre-money valuation and any one deal term. The other values update automatically for fast percent-sold math.
What this simple valuation calculator solves
This page answers one founder question quickly: if the company is worth a stated pre-money amount, how do raise size, percent sold, and post-money valuation move together? It is built for napkin math before you open a share-level model.
The identities are fixed and transparent: post-money valuation equals pre-money valuation plus raise amount, and ownership sold equals raise amount divided by post-money valuation. Change any one deal term and the other two follow from those formulas.
Worked example: $10M pre-money and 20% sold
Suppose pre-money valuation is $10,000,000 and the company wants to sell 20% in the round. Ownership sold of 20% implies post-money valuation of $10,000,000 ÷ (1 − 0.20) = $12,500,000. The raise amount is then $12,500,000 − $10,000,000 = $2,500,000.
Flip the inputs: if pre-money is $10,000,000 and the raise is $2,000,000, post-money is $12,000,000 and ownership sold is $2,000,000 ÷ $12,000,000 = 16.67%. Existing holders keep 83.33% on this simplified post-money basis before modeling option pools or convertibles.
Methodology notes
- Pre-money is the anchor; the calculator does not invent a valuation from revenue or comparable companies.
- Ownership sold is post-money investor ownership from cash raised, not a legal share class label.
- Share counts, price per share, and pool treatment are intentionally omitted so the four fields stay synchronized and readable.
Educational-use disclaimer: FounderMath is for educational planning only. It is not legal, tax, accounting, investment, securities, financial, or fundraising advice.
When to upgrade
Need price per share, investor shares, or founder share estimates? Use the full pre/post-money calculator with fully diluted share inputs.
Common mistake
Do not treat a post-money quote as pre-money. Swapping those labels changes the ownership being sold even when the cash raise looks identical.
Related tools
Valuation hub · Full Pre/Post-Money Valuation Calculator · Pre-Money vs Post-Money explainer · SAFE Conversion Calculator · Founder Dilution Calculator
FAQ
What does ownership sold mean in this simple calculator?
Ownership sold is the new investor's post-money ownership percentage. It equals raise amount divided by post-money valuation when those two fields are known.
Why does editing one deal term update the other two?
Pre-money valuation stays fixed as the anchor. Ownership sold, raise amount, and post-money valuation are linked by post-money = pre-money + raise and ownership sold = raise ÷ post-money, so one edited deal term solves the other two.
When should I use the simple calculator instead of the full valuation calculator?
Use this page for quick percent-sold and raise math when you do not need share counts, price per share, or option-pool detail. Switch to the full calculator when you need investor shares or founder share estimates.
Does this calculator include option pool dilution?
No. It only models the four core deal numbers: pre-money, ownership sold, raise amount, and post-money. Model pool top-ups with the Option Pool Calculator or Founder Dilution Calculator.
Is this legal or fundraising advice?
No. FounderMath is educational planning only. Actual priced-round ownership depends on the signed documents, share classes, and advisor review.
Last reviewed September 7, 2026. See Methodology and Sources.