Post-Money Valuation: Formula, SAFEs and Ownership

Brian Nichols is the co-founder of Angel Squad, an angel investing community where aspiring and active angels learn from Hustle Fund’s approach, review curated deal flow, and connect with peers.

A $500,000 investment at a “$5 million valuation” can buy two different ownership stakes. As an angel investor, you need the pre-money or post-money label before the number is useful. You also need to know whether you’re buying shares in a priced round or signing a contract for future shares.

1. Calculate Post-Money Valuation in a Priced Round

Post-money valuation is the agreed value of a company’s ownership interests immediately after a financing. Pre-money valuation is its agreed value before the new investment. A priced round sets a price per share and issues shares to investors.

For a straightforward priced round, the post-money valuation formula is:

Post-money valuation = Pre-money valuation + New investment

The corresponding ownership calculation is:

Investor ownership = Investor’s investment ÷ Post-money valuation

Use the total new investment in the round for the first formula and your own check for the second. Other investors’ money belongs in the post-money value, too.

The $500,000 Example

This hypothetical, simplified example compares two priced rounds. Assume $500,000 is the entire new investment, all new shares have the same price, and there are no securities converting into shares, option-pool changes or fees affecting the calculation. An option pool is equity reserved for employee awards.

• $5 million post-money: The pre-money valuation is $4.5 million. Adding the $500,000 investment gives $5 million post-money. The investor’s stake is $500,000 ÷ $5 million = 10%.
• $5 million pre-money: Adding the $500,000 investment gives $5.5 million post-money. The investor’s stake is $500,000 ÷ $5.5 million = approximately 9.1%.

The same check buys about 0.9 percentage points less ownership in the second deal. The existing holders collectively retain 90% in the first scenario and approximately 90.9% in the second.

These percentages use the capitalization basis agreed for the financing, meaning which shares count in the ownership calculation. “Fully diluted” ownership includes potential shares, such as options and converting securities, under stated assumptions. A capitalization table, or cap table, records ownership and potential shares. Our guide to reading a cap table explains how that denominator differs from shares currently outstanding.

A financing valuation expresses the price negotiated for ownership. It isn’t an exact asset-and-liability appraisal, cash in the bank or a promised exit value. Your ownership percentage also doesn’t establish your share of sale proceeds. Debt and contractual payout rights can change how proceeds are divided.

2. Separate a SAFE Cap From Final Ownership

A Simple Agreement for Future Equity (SAFE) is a contract for future shares. Signing one doesn’t issue those shares immediately. A valuation cap is a contractual input used to calculate the conversion price; it isn’t a priced-round valuation or a guarantee of the company’s future value.

Y Combinator (YC) publishes several standard SAFE forms. Some forms use a discount, a lower conversion price than new investors pay, or leave the cap unset. The cap-based ownership shortcut doesn’t apply to every form, amendment or financing that combines different contracts.

Pre-Money SAFE Caps

Ownership under YC’s original pre-money SAFE depends on other convertibles and conversion capitalization, including the financing’s pool increase. Cap plus cash raised isn’t a final-ownership formula.

Post-Money SAFE Caps

YC’s post-money SAFE guide estimates ownership as investment ÷ cap, before priced-round money and excluded pool increases. A round near or below the cap can yield more ownership.

The current cap-only form includes outstanding shares, convertibles, outstanding and promised options, and the existing unissued pool. A financing-time pool increase enters Company Capitalization, the conversion share count, only to the extent Promised Options exceed the pre-increase unissued pool. These are promised-but-ungranted awards under the form’s definition; the remaining increase dilutes SAFE holders.

Hypothetical, simplified standard post-money SAFE example, assuming cap-based conversion, unchanged terms and no pool increase:

1. Before priced-round money: $100,000 ÷ $5 million cap = estimated 2%. Additional standard post-money SAFEs don’t dilute this cap-based stake.
2. After new investors buy 20%: 2% × 80% = 1.6%, assuming no other changes.

Pro rata rights allow more investment to maintain ownership under their terms. YC offers an optional side letter; signed documents control.

3. Connect the Financing to Milestones and the Cap Table

In her 2018 discussion of investor incentives, our co-founder and general partner Elizabeth Yin wrote, “valuation is an important consideration, but it’s not the only one.” We apply that lens by considering both the ownership a deal buys and what the capital can help the company accomplish.

A lower entry valuation can buy more ownership for the same check. The company still needs enough capital to make progress. A higher valuation requires a credible explanation of the business progress that could support the next financing.

Keep the financing discussion tied to four questions:

1. How much runway does this provide? Ask for current cash, the full raise, financing costs and expected monthly cash use. Runway is the time before the company exhausts its cash. A hiring plan that increases spending changes that timeline.
2. What milestones can the company reach with this capital? Look for specific outcomes, such as launching a product, demonstrating customer retention or reaching a revenue target. A spending plan should explain how the team gets there.
3. What could support the next round’s valuation after those milestones? Discuss the evidence future investors would need and the funding alternatives if progress takes longer. Reaching a milestone doesn’t guarantee another round or a higher price.
4. Is enough equity left for employees and future rounds? Include the hiring plan, promised grants and future financing needs. Founder ownership alone doesn’t show whether the company can fund and staff its next stage.

Put the Whole Financing in the Model

Request a dated current cap table and a pro forma version, which models ownership after the proposed financing. The model should identify which shares and pool changes enter each conversion calculation, then show ownership after new shares are issued.

The supporting schedules should include:

• Existing shares and employee equity: Issued shares, granted and promised options, the unused employee pool and the proposed pool increase.
• Every convertible instrument: All SAFEs and convertible notes (loans that can convert into shares), their investment amounts, caps, discounts, applicable note interest, conversion definitions and amendments.
• Participation rights: Pro rata side letters and the additional checks assumed in the financing.
• Economic terms: The security you’ll receive and its payout rights, including any liquidation preference, which determines payment priority when a company is sold or winds down. Our angel investing glossary explains these terms.

An option-pool increase included in pre-money capitalization generally dilutes existing holders before the new investor buys shares. A later increase can dilute new investors too. The financing documents determine who bears that dilution, so the model needs the agreed sequence.

Elizabeth described the recordkeeping problem in Democratizing Knowledge (Hustle Fund, 2021): “It's horrifying to say that I've rarely seen cap table math done correctly at each round.” Use a model that exposes its formulas and assumptions, with independent legal review of the signed documents and conversion mechanics.

If you invest through a fund or another pooled investment structure, distinguish its company ownership from your own economic interest. Fees, carried interest, which is a manager’s share of investment profits, and taxes can reduce what you receive. An ownership calculation alone doesn’t capture those costs.

4. Make the Ownership Estimate Useful

Give every percentage a label: the security, its capitalization basis and the financing checkpoint. Keep the cash plan and milestone plan beside those figures so you can judge the tradeoff you’re making.

Learning these mechanics with other investors gives you a place to discuss assumptions and understand different investing judgments. It doesn’t replace independent advice or remove the risk of a failed investment.

For education and peer discussion of curated startup deals, apply to Angel Squad.

This is general education, not investment, accounting, valuation, legal or tax advice. All worked examples are hypothetical and simplified, not projections. Startup investing is speculative, illiquid and long term; most of your startup investments may fail, and you can lose your entire investment.

Past results, current valuation marks and ownership estimates don’t guarantee future results or realized proceeds. Outcomes depend on the governing offering and legal documents, cap-table facts, capitalization and conversion terms, valuation policy and timing, and applicable fees, carried interest and taxes. Seek independent review from qualified investment, accounting, valuation, legal and tax professionals before investing.