This Series A Equity Calculator estimates the ownership percentage issued to new investors and the implied post-money capitalization. It helps founders, employees, and finance teams translate investment terms into ownership outcomes.
Enter the pre-money valuation and new investment. Optional existing fully diluted shares let the calculator estimate a financing price per share and new shares issued. The calculation is simplified and excludes option-pool changes, warrants, convertible instruments, and transaction-specific rights.
1. Enter pre-money value
Use the negotiated value immediately before the new financing.
2. Enter the investment
Add the amount invested by the new Series A investors.
3. Add existing shares
Use the fully diluted pre-financing share count when estimating price per share.
4. Include other new equity
Optionally add other equity value issued at the financing.
5. Review ownership
Check investor ownership, post-money value, and estimated shares issued.
The model assumes all new equity is priced consistently and treats the entered share count as fully diluted. Actual legal documents may define capitalization differently.
Investor ownership is the new investment divided by the resulting post-money capitalization.
Use the company capitalization table and financing documents for transaction-level ownership analysis.
Given
Calculation
Post-money = $24,000,000 + $8,000,000 = $32,000,000. Ownership = $8,000,000 / $32,000,000 = 25%. Price per share = $24,000,000 / 12,000,000 = $2.00.
Result
New investor ownership = 25.00%.
The investor would receive about 4,000,000 shares under the simplified assumptions.
Ownership is based on post-money value because the investment becomes part of the company capitalization.
Use the fully diluted pre-financing count if that is how the term sheet defines pricing.
Only if you include its value in other new equity. A precise option-pool shuffle requires cap-table modeling.
Yes. Enter their total investment to estimate the group ownership, or run them separately only if terms are identical.
Preferred rights, convertible securities, warrants, pool adjustments, and capitalization definitions can alter the final result.