Pre and Post Money Valuation Calculator

Startup valuation relies on a direct mathematical relationship between the cash injected into the company and the percentage of ownership handed over in return. First, the Post-Money Valuation is determined by dividing the total investment amount by the fractional investor equity percentage: Post-Money = Investment / Investor Equity. Next, the Pre-Money Valuation is calculated by subtracting the new capital injection from that resulting post-money figure: Pre-Money = Post-Money - Investment. This gives founders a clear picture of what their company was worth immediately prior to accepting the fresh round of financing.

Imagine an early-stage software startup securing a new funding round. An angel investor agrees to inject an Investment of $500,000 in exchange for 20% Investor Equity (expressed as 0.20). First, we calculate the post-money valuation: $500,000 / 0.20 = $2,500,000 Post-Money. Next, we determine the pre-money valuation by subtracting the cash infusion: $2,500,000 - $500,000 = $2,000,000 Pre-Money. This means the startup was valued at $2 million right before the wire transfer hit their bank account, and is worth $2.5 million immediately after.

Always ensure your equity percentages and investment amounts match the same currency and decimal formats before running calculations. Remember that convertible notes and SAFEs can complicate standard equity math by introducing valuation caps and discounts that only convert during a priced round. Keep a clean cap table to track dilution across multiple funding stages to protect your long-term founder ownership percentage.