Quick Calculator 3
Startup Dilution Calculator
Estimate founder dilution after a funding round based on pre-money valuation, round size, current ownership and any option pool increase.
This calculator is designed to help founders see how quickly ownership shifts during fundraising. It is directional and simplified. It does not replace full cap table modelling.
Current Ownership
Use the combined founder ownership before the new round closes.
Enter the existing unallocated or allocated employee option pool as a percentage.
Round Terms
Use the negotiated pre-money valuation, not the post-money headline.
This is the actual size of the round being raised.
Use 0 if there is no investor-driven pool increase before the round.
This changes interpretation language only, not the core maths.
Please complete every field before calculating your result.
Founder Ownership After Round
0%
This is your estimated founder ownership after new money and pool expansion.
New Investor Ownership
0%
This is the percentage implied by the new money at the stated pre-money.
Founder Dilution
0%
This is the total reduction in founder percentage ownership from this round setup.
Dilution Interpretation
What Is Driving Dilution
What Founders Should Watch