How do you calculate pre-money and post-money valuation?

Full Explanation

Pre-money and post-money valuation are fundamental concepts in startup financing that determine how much of the company investors receive for their investment. The relationship is simple: Post-Money Valuation = Pre-Money Valuation + Investment Amount. The investor's ownership percentage equals Investment Amount divided by Post-Money Valuation. For example, a startup with a £8 million pre-money valuation raising £2 million has a £10 million post-money valuation. The investor receives 20% ownership (£2M / £10M). If the same company had negotiated a £12 million pre-money valuation for the same £2 million investment, the post-money would be £14 million and the investor would receive 14.3% — significantly less dilution for the founders. The pre-money valuation is the negotiated number that reflects the company's current worth based on traction, market opportunity, team, and competitive dynamics. It is the primary lever in investment negotiations. The option pool is a critical detail: investors often require that an employee option pool (typically 10-20%) be included in the pre-money valuation, effectively diluting existing shareholders before the investment. A £8 million pre-money including a 15% option pool means the company's enterprise value is being treated as £8 million, of which £1.2 million is reserved for future employees. For convertible instruments (SAFEs and convertible notes), the distinction matters at conversion. A post-money SAFE with a £5 million cap means the investor's ownership is calculated on a £5 million post-money basis — their percentage is known at investment. A pre-money cap means the investor's final percentage depends on how much other capital converts alongside them. Y Combinator's current standard SAFE uses post-money caps for this reason — clarity for all parties.

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