Pre-Money and Post-Money Valuation

The company's value before and after new money comes in, and how ownership is calculated.

Also known as: pre-money, post-money, pre-money valuation

Pre-money valuation is what the company is worth before new investment; post-money is pre-money plus the money raised. Ownership falls out directly: invest $2M at an $8M pre-money → $10M post → new investors own 20%. Every priced-round conversation is secretly about these two numbers.

pre $8M + raise $2M = post $10M → new money owns $2M/$10M = 20%
founders/employees share the remaining 80% (before option pool mechanics)

The subtlety is the option pool: investors typically require an expanded pool pre-money, meaning existing holders (mostly founders) pay for it, not the new money. A “20% round” with a simultaneous pool top-up dilutes founders more than the headline suggests — model it (pool shuffle).

The classic mistakes:

Negotiating valuation, ignoring structure. Liquidation preferences, pool terms and pro-rata rights move real money. A high valuation with harsh terms can be worse than a lower clean one (term sheet).
Confusing valuation with money in hand. A $10M post-money company with $2M raised has $2M to spend, not $10M. Valuation is a price tag, not a bank balance.
Forgetting fully-diluted basis. Valuations divide by fully-diluted shares (including options and converting SAFEs), not just outstanding founders’ shares. The denominator matters as much as the number.
Optimizing the number over the partner. A slightly lower valuation with the right lead investor (network, follow-on, reputation) outperforms a record price with dead money behind it.

Learn the arithmetic cold: pre, post, percentages, pool mechanics, conversion stacks. Founders who cannot do this math in a meeting negotiate blind — see dilution and SAFE conversion.