Equity Dilution Calculator

Equity dilution happens when a company issues new shares, reducing the ownership percentage of existing shareholders. When investors put money into your company, they receive newly created shares in return. Even though the total number of your shares stays the same, you now own a smaller slice of a larger pie.

The core formula for calculating dilution after a funding round is:

Example: If your pre-money valuation is $5M and you raise a $1M round, the post-money valuation is $6M. A founder who owned 100% now owns 100% x ($5M / $6M) = 83.3%. That 16.7% went to investors.

Dilution doesn't just happen once — it compounds with every round. Each new round dilutes everyone who came before, including the founder and all previous investors. Here's how it plays out using the calculator's default scenario:

The option pool makes it worse. Investors typically require founders to expand the option pool before each round — known as the "pre-money option pool shuffle." This pool is carved from the founder's shares, not the investors', amplifying dilution beyond what the headline round terms suggest.

Industry benchmarks give founders a reference point for what to expect at each stage:

• Seed round: 15–25% dilution. Typical round sizes of $500K–$3M at pre-money valuations of $3M–$10M.
• Series A: 20–30% dilution. Larger rounds ($5M–$15M) but higher valuations ($15M–$50M). Investors expect proven product-market fit.
• Series B: 15–25% dilution. Valuations grow faster than round sizes at this stage, moderating dilution somewhat.

These figures include both the investor's equity share and option pool expansion. After three rounds, a founder who started at 100% commonly retains 25–45% ownership, depending on valuation growth and negotiating leverage.

Dilution is not inevitable at every stage. Founders who plan ahead can retain significantly more ownership:

Raise Less Capital

Every dollar raised comes with an equity cost. Optimize your unit economics and extend your runway through efficient operations before raising. Only raise what you need to hit specific milestones that will materially increase your valuation.

Negotiate a Higher Valuation

A higher pre-money valuation means less dilution for the same amount raised. Build leverage through strong metrics, competitive term sheets, and demonstrated traction before entering negotiations.

Use Non-Dilutive Financing

Revenue-based financing, venture debt, and government grants provide capital without any equity cost. For SaaS companies with predictable recurring revenue, revenue-based financing can fund growth while keeping ownership at 100%.

Manage Your Option Pool

Investors often push for large option pools (15–20%) carved from the founder's pre-money stake. Only allocate what you need for the next 12–18 months of hiring. Refresh the pool in future rounds when valuations are higher.

Dilution is acceptable when the capital deployed creates more enterprise value than the equity given away. A Series A that funds product-market fit acceleration can be transformative — 70% of a $100M company is worth far more than 100% of a $5M one.

Dilution becomes problematic when capital is used for runway extension, operational costs that don't compound, or when founders raise at depressed valuations under pressure. The key question is whether each dollar of equity sold generates a multiple in enterprise value.

Revenue-based financing (RBF) gives SaaS founders an alternative to equity rounds. Instead of selling shares, you receive capital in exchange for a percentage of monthly revenue until a fixed repayment cap is reached. Founders retain 100% equity, maintain full control, and avoid cap table complexity.

Founderpath provides revenue-based financing for SaaS companies with $15K+ MRR. You connect your billing platform, receive a funding offer based on your recurring revenue metrics, and deploy capital for growth — all without giving up a single share.