# Startup Equity Dilution & Cap Table Simulator Simulate venture capital seed and Series A funding rounds, share pricing, option pool dilution, and founder equity ownership stakes. --- - **Canonical URL:** https://dothecalculation.com/calculators/startup-equity-dilution-calculator - **Category:** Business tools - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology --- ## Simulate startup equity dilution and funding rounds Input founder shares, investment round size, pre-money valuations, and option pool expansions to calculate post-money values, price per share, and post-round equity. - Investor equity percentages - Co-founder share dilution metrics - Share pricing calculation ## The Mechanics of Startup Equity Dilution For startup founders, raising venture capital is a key milestone for growth, but it comes at the cost of equity dilution. Equity dilution occurs when a company issues new shares to investors, which reduces the ownership percentage of existing shareholders. Although your individual ownership percentage drops, raising capital should increase the total valuation of the company. The goal of venture funding is to own a smaller percentage of a much larger, more valuable business. To model dilution, you must establish the pre-money valuation (what the company is worth before funding) and the investment amount. Adding these yields the post-money valuation. Investor ownership is then calculated as the investment divided by the post-money valuation. ## Simulating Option Pools and Post-Round Cap Tables Venture capital investors almost always require startups to create or expand an Employee Option Pool (ESOP) before closing a funding round. This pool consists of shares reserved for hiring future employees and typically ranges from 10% to 20% of post-money equity. Creating the option pool post-money dilutes the existing founders further. In a standard VC term sheet, the option pool is created inside the "pre-money cap table," which means the dilution is borne entirely by the founders rather than shared with the new investors. Understanding how the option pool affects your final equity is crucial for term sheet negotiations. Using a [business valuation calculator](/calculators/business-valuation-calculator) can help estimate your baseline pre-money valuation before negotiating dilution. ## Calculating Price Per Share and Share Counts The actual share price in a funding round is calculated by dividing the pre-money valuation by the total number of pre-round shares. This share price determines how many new shares will be issued to the investor for their cash. Founder equity is tracked by multiplying their original shares by the new share price to find their dollar holdings, and comparing it to the new total post-round share count. This cap table audit ensures that the share counts align with legal agreements. To optimize company planning, founders track these financing steps alongside a working capital plan to manage startup cash reserves once the funding round closes and cash is deposited. ## How to Use This Calculator Enter each founder's current share count, the investment amount being raised, the agreed pre-money valuation, and the option pool size as a percentage of post-round equity. The calculator adds the investment to the pre-money valuation for post-money valuation, divides investment by post-money for investor equity, subtracts investor and option pool percentages from 100% for the remaining founder pool, then splits that remaining pool between founders in proportion to their pre-round share counts. ## Worked Example: $500,000 Seed Round Two co-founders hold 60,000 and 40,000 shares respectively (60%/40% split). They raise $500,000 at a $2,000,000 pre-money valuation, with a 10% option pool. Post-money valuation: $2,000,000 + $500,000 = $2,500,000. Investor equity: $500,000 ÷ $2,500,000 = 20%. Remaining pool for founders: 100% − 20% − 10% = 70%. Founder 1 (60% of pre-round shares): 70% × 60% = 42%. Founder 2 (40% of pre-round shares): 70% × 40% = 28%. Share price: $2,000,000 ÷ 100,000 pre-round shares = $20/share. ## Related Calculators Sanity-check your pre-money valuation assumption with the [business valuation calculator](/calculators/business-valuation-calculator) before running the round through this simulator. ## Frequently asked questions ### What is equity dilution? The decrease in ownership percentage for existing shareholders caused by the issuance of new shares to investors. ### What is pre-money valuation? The agreed-upon value of a startup before receiving new investment capital. ### What is post-money valuation? The value of the startup after receiving new investment capital, calculated as pre-money valuation plus the investment amount. ### How is investor equity calculated? It is calculated by dividing the investment amount by the post-money valuation, multiplied by 100. ### What is an option pool (ESOP)? A block of shares set aside to attract and reward employees, typically representing 10% to 20% of the company's total shares. ### Why do VCs require option pools pre-money? By creating the option pool pre-money, the dilution falls entirely on the founders, protecting the incoming investor's target ownership percentage. ### How is share price calculated in a round? Share price is calculated by dividing the pre-money valuation by the total number of outstanding pre-round shares. ### What is a cap table? A capitalization table is a spreadsheet or database that records the ownership percentages, share counts, and values of all startup equity holders. ### Does dilution reduce the dollar value of my shares? Not if the valuation increases sufficiently. Dilution reduces your percentage ownership, but the dollar value of your stake (shares × share price) should rise. ### What is a seed round? The first formal equity round raised by a startup to fund early product development and market validation. ### What is a Series A round? The second major funding round, focused on scaling product distribution and building repeatable sales channels. ### What is down round protection? Anti-dilution clauses in investor contracts that protect them from losing value if the company raises future funds at a lower valuation. ## Related concepts - **Cap Table** — A database documenting a startup's equity ownership structure. - **Employee Option Pool** — Equity reserved for future employees to align incentives with company growth. - **Post-Money Valuation** — The total value of a company immediately after a funding round completes. ## Related guides - [Business Valuation Methods: A Practical Owner Guide](https://dothecalculation.com/blog/business/business-valuation-methods) — Compare market, income, and asset valuation methods, normalize revenue and profit, and use multiples as a planning range rather than a formal appraisal. ## Related calculators - [Convertible Note & SAFE Valuation Calculator](https://dothecalculation.com/calculators/convertible-debt-pricing-calculator) — Calculate startup convertible note and SAFE conversion share price, post-conversion ownership, and founder dilution impact. - [Capital Expenditure (CapEx) ROI Calculator](https://dothecalculation.com/calculators/capex-roi-calculator) — Evaluate capital expenditure projects using return on investment, simple payback period, and net present value metrics before you invest. - [Weighted Average Cost of Capital (WACC) Calculator](https://dothecalculation.com/calculators/wacc-calculator) — Estimate Weighted Average Cost of Capital, after-tax cost of debt, and capital weights to evaluate investment and financing decisions. - [M&A Accretion/Dilution Calculator](https://dothecalculation.com/calculators/mergers-acquisitions-accrual-calculator) — Analyze pro forma financial impacts of a merger, combined earnings per share, and synergy break-even targets for M&A deals. - [Business Valuation Calculator](https://dothecalculation.com/calculators/business-valuation-calculator) — Estimate your business value using practical valuation methods such as earnings multiples and asset-based approaches for buyers or investors. - [Discounted Cash Flow (DCF) Calculator](https://dothecalculation.com/calculators/corporate-valuation-dcf-calculator) — Estimate a company enterprise and equity value using a multi-year discounted cash flow model with terminal value assumptions. --- _This calculator is for educational and business planning purposes only and does not constitute professional financial, tax, or legal advice. Verify all rates, margins, and contract terms before making operational business decisions._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/startup-equity-dilution-calculator). Quote freely with attribution and a link to this page._