Pre-money vs. post-money valuation

Pre-money valuation is what the company is worth immediately before new money comes in. Post-money valuation is the pre-money plus the investment. The investor’s stake is the investment divided by the post-money, which is why the two numbers cannot be swapped: a $2 million investment at an $8 million pre-money buys 20%, while the same check at an $8 million post-money buys 25%.

The whole relationship is three lines:

  • Post-money = pre-money + investment
  • Investor ownership = investment ÷ post-money
  • Post-money = investment ÷ ownership (when you know the stake instead of the valuation)

What a Shark Tank ask is really saying

Every pitch on Shark Tank is a valuation stated backwards. “$100,000 for 10%” means the founder is selling a tenth of the company for $100,000, so the whole company — after the money — is worth $1 million. That is a post-money valuation of $1 million and a pre-money valuation of $900,000. When a shark counters with “$100,000 for 25%”, the post-money drops to $400,000: same check, a company valued at less than half as much. Choose “Equity offered” above and you can read any ask, or any counteroffer, the same way.

Two caveats keep that reading honest. On-air deals are often restructured during due diligence after taping, so the deal that closes is not always the deal that aired. And many TV deals include royalties, lines of credit or advisory shares, which change the economics in ways a single valuation number does not capture.

Where valuations get more complicated

Real priced rounds usually measure ownership on a fully diluted basis, including the employee option pool, and investors often ask for that pool to be enlarged inside the pre-money. That shifts the dilution onto existing shareholders. Model it with the startup dilution calculator. If you are raising on a SAFE rather than a priced round, the cap is a post-money valuation in its own right — the SAFE calculator converts it. For how investors arrive at the number in the first place, read how to value your startup.