#961 · Startup Tool

Series A Funding Calculator

Estimate Series A investment ownership, post-money valuation, founder dilution, option pool pressure, and funding health before accepting a term sheet.

Calculator

Startup assumptions
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How to use this calculator

  • Enter your pre-money valuation and proposed investment amount.
  • Add current founder ownership and any option pool increase required by investors.
  • Use the result to compare investor ownership, dilution, and founder control before negotiating.

What the result means

The result shows the new investor ownership and whether founder dilution remains healthy for a Series A round. It also estimates post-money valuation, remaining founder ownership, and dilution pressure.

Post-money valuation = pre-money valuation + investment. Investor ownership = investment ÷ post-money valuation.

This is a planning estimate, not a legal cap table. Confirm final ownership with counsel and your financing documents.

Example calculation

If pre-money valuation is $8,000,000 and investment is $2,000,000, post-money valuation is $10,000,000 and the Series A investor receives 20%.

Tips for better results

  • Raise enough to reach the next major milestone, not the largest amount possible.
  • Watch option pool expansion because it can dilute founders before the round.
  • Compare several valuation and raise scenarios before signing a term sheet.

FAQ

How much should I raise in a Series A round?

A practical Series A round usually funds 18–24 months of runway and a clear milestone such as ARR growth, product expansion, or enterprise sales traction.

How much equity should founders give up in Series A?

Founders often give up around 15–30% in a Series A, but the right amount depends on valuation, capital needs, and option pool requirements.

What is a typical Series A valuation?

Typical Series A valuation varies by market and traction, so compare the proposed valuation against ARR, growth rate, retention, and comparable deals.

How does option pool expansion affect dilution?

Option pool expansion usually dilutes existing holders before or during the round, reducing founder ownership even if the headline investor percentage looks reasonable.

How much ownership should founders keep after Series A?

Founders commonly try to keep enough ownership and voting control to remain motivated and credible for later rounds.

Startup decision modules

ModuleWhat it shows
Main ResultPrimary startup KPI for this calculator.
Health Score0–100 score based on founder-friendly thresholds.
Scenario SignalShows whether the current assumption is healthy, average, or risky.
RecommendationPractical next action for fundraising, growth, retention, or cost control.

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