How do pre-money and post-money valuations work in venture capital?

Pre-money and post-money valuations are the core of VC deal structuring. They determine how much of the company the investor receives for their investment.

Definitions:

• Pre-money valuation: What the company is worth before the new investment
• Post-money valuation: What the company is worth after the new investment
• Relationship: Post-money = Pre-money + Investment

Investor ownership:

Investor % = Investment / Post-money valuation

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Full Worked Example — Helix Robotics (fictional Series A):

Situation: Helix Robotics is a 2-year-old startup with a working prototype. Redwood Ventures wants to invest.

Term	Value
Pre-money valuation	$12 million
Investment amount	$3 million
Existing shares outstanding	4 million

Step 1: Post-money valuation Post-money = $12M +$3M = $15 million

Step 2: Investor ownership Redwood's stake = $3M /$15M = 20%

Step 3: Price per share Pre-money price per share = $12M / 4M shares = **$3.00/share**

Step 4: New shares issued to Redwood New shares = $3M /$3.00 = 1,000,000 shares

Step 5: Updated cap table

Shareholder	Shares	Ownership
Founders	3,200,000	64.0%
Early employees (ESOP)	800,000	16.0%
Redwood Ventures (Series A)	1,000,000	20.0%
Total	5,000,000	100%

The VC Method — Working Backward:

VCs typically start with the expected exit value and work backward to determine what pre-money valuation they can accept.

Input	Value
Expected exit value (Year 5)	$100 million
Required return (IRR)	40% per year
Investment	$3 million

Step 1: Required future value of investment: FV = $3M x (1.40)^5 =$3M x 5.378 = $16.13M

Step 2: Required ownership at exit: Ownership = $16.13M /$100M = 16.13%

Step 3: Post-money valuation implied: Post-money = $3M / 0.1613 = **$18.6M**

Step 4: Pre-money valuation: Pre-money = $18.6M -$3M = $15.6M

So Redwood should accept a pre-money valuation no higher than $15.6M to achieve their 40% target IRR.

Key Nuances:

1. Dilution from future rounds. If Helix raises a Series B, both founders and Series A investors get diluted. VCs account for this by requiring higher initial ownership.
2. Anti-dilution protections. Preferred shares often have anti-dilution clauses (weighted-average or full ratchet) protecting VCs in down rounds.
3. Liquidation preference. VCs get their money back first in a liquidation event — this means post-money valuation overstates the effective price the founders received.

Exam tip: CFA Level II questions typically give you exit value, required return, and investment amount, then ask for the implied pre-money valuation or investor ownership percentage. Nail the VC method formula and the dilution adjustment.

Learn more about private equity valuation in our CFA Level II course.