What Is Startup Valuation?
Startup valuation refers to the estimated worth of a startup at a specific point in time. Early-stage startups are often valued based on:
- Market size and opportunity
- Founding team strength
- Product development stage
- User traction and revenue
- Comparable deals and industry trends
Valuation isn’t just a number — it determines how much equity you give up when raising capital.
🔹 Pre-Money Valuation: The company’s valuation before new investment is added.
🔹 Post-Money Valuation: The company’s valuation after the new investment is included.
Formula: Post-Money Valuation = Pre-Money Valuation + Investment Amount
Example:
Let’s say:
- Pre-Money Valuation: $4 million
- Investment Amount: $1 million
Then:
- Post-Money Valuation = $4M + $1M = $5 million
- Investor Ownership = $1M / $5M = 20%
So the new investor gets 20% of the company, and the founders + existing shareholders are diluted accordingly.
Step by Step: The Mechanics Behind the Numbers
The formula above tells you the percentages. To see how a round is actually executed, you need to follow the shares. Every priced round works through the same four steps.
- Agree the pre-money valuation. This is the value placed on the company as it exists today.
- Calculate the price per share. Price per share = Pre-money valuation ÷ Fully diluted shares before the round.
- Calculate the new shares issued. New shares = Investment amount ÷ Price per share.
- Calculate ownership. Investor ownership = New shares ÷ Total shares after the round. This always equals Investment ÷ Post-money valuation.
A Worked Example
For example, imagine a hypothetical startup with 6,000,000 fully diluted shares that agrees a $6M pre-money valuation and raises $1.5M.
- Price per share: $6,000,000 ÷ 6,000,000 = $1.00
- New shares issued: $1,500,000 ÷ $1.00 = 1,500,000
- Total shares after the round: 7,500,000
- Post-money valuation: 7,500,000 × $1.00 = $7.5M
- Investor ownership: 1,500,000 ÷ 7,500,000 = 20%
- Existing holders: 6,000,000 ÷ 7,500,000 = 80%
Notice that the existing shareholders still hold exactly the same number of shares. They have not sold anything — the company has simply issued new shares, so each existing share now represents a smaller slice of a larger company.
Working Backward From a Post-Money Number
Investors often quote terms the other way round: “$1.5M at a $7.5M post.” To translate:
- Pre-money = Post-money − Investment ($7.5M − $1.5M = $6M)
- Investor ownership = Investment ÷ Post-money ($1.5M ÷ $7.5M = 20%)
And if you know how much you want to raise and how much equity you are willing to sell, you can solve for the valuation you need: Post-money = Investment ÷ Ownership sold. Raising $1.5M for 15%, for instance, requires a $10M post-money valuation.
Why It Matters
- Dilution: Founders often underestimate how much equity they’re giving away.
- SAFE/Note Conversions: SAFEs typically convert based on post-money terms, affecting ownership.
- Cap Table Planning: Pre- and post-money directly shape how shares are divided.
Valuation and Ownership Table
- Investment $500K — Pre-Money $2M — Post-Money $2.5M — Investor % 20% — Founder % 80%
- Investment $1M — Pre-Money $4M — Post-Money $5M — Investor % 20% — Founder % 80%
- Investment $1.5M — Pre-Money $6M — Post-Money $7.5M — Investor % 20% — Founder % 80%
Factors That Influence Valuation
- Revenue and profit margins
- User growth and engagement
- Market trends and demand
- Competition and barriers to entry
- Stage of product (MVP, beta, scaling)
- Founder reputation and track record
Tools to Model Valuation and Dilution
- Carta – Cap table management
- Pulley – Modeling dilution scenarios
- EquitySim – Early-stage simulations
- AngelCalc – Valuation and SAFE calculator
Whatever tool you use, check its output by hand once using the four steps above. If the share count, price per share and percentages don’t reconcile, something in the inputs is wrong.
Common Mistakes
- ❌ Confusing pre- and post-money when negotiating
- ❌ Not modeling dilution across multiple rounds
- ❌ Overvaluing too early (makes future rounds harder)
- ❌ Underestimating impact of SAFEs and convertible notes
Related Reading
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