Startup equity dilution is when your ownership percentage goes down because the company issues new shares—usually to investors, employees through an option pool, or both. Raising capital is really about deciding who owns what as your startup grows. Use Bowora's free dilution calculator to model your cap table in real time.

Core terms founders should know

Pre-money and post-money valuation

Pre-money valuation is what your company is worth before new money comes in. If investors put money in after that, the company's value increases—that is post-money valuation. Post-money equals pre-money plus the new investment. Example: $2M pre-money plus $200K investment equals $2.2M post-money.

Option pool

An option pool is a slice of shares set aside for future employees. Founders usually create or top up this pool before a new round, which slightly reduces their ownership. When investors require a pre-money pool, existing holders—not the new investor—take that dilution first.

Cap table

A cap table is your ownership table. It shows how much each founder, investor, and employee owns at every stage. Keep it updated after every round so you never negotiate blind.

Funding stages

Startup stages usually follow a similar path: Pre-seed, Seed, Series A, Series B, and so on. Each round brings more money, more investors, and more dilution. See our guides on pre-seed, seed, and Series A for stage context.

What dilution means in practice

Dilution means your percentage goes down, even if the company becomes more valuable overall. Founders often fear losing control, but the trade is intentional: you give up a slice of a smaller pie to build a much larger one. The question is not "how do I avoid dilution?" but "is this round worth the ownership I am giving up?"

Model your scenario before term-sheet conversations. Our startup dilution calculator shows founder %, investor %, and option pool impact across multiple rounds—free, no login, nothing stored on our servers.

Seed round example: Bowora

Bowora is currently in the seed stage. At this point we already have a working product, early users, and some initial traction. What we need now is fuel to grow faster, improve revenue, and get ready for the next funding round.

We assume a seed valuation of $2,000,000, which sits in the typical range for early startups. Before bringing in new money, we set aside a 15% option pool for future hires, which is standard practice for seed investors.

In this round, we are raising $200,000 to cover the next 12 months. About 60% of this will go to marketing to acquire users and build awareness, and 40% will go to hiring and other operating costs.

On the cap table, the big circle shows the post-money value of the company, $2.2M, which includes our $2M valuation plus the new $200K investment. Founders still hold a majority, but the option pool and new investor now have meaningful slices.

Series A example: one year later

After one year, let's imagine Bowora executed well. We grew traction, improved revenue, and proved that the model works. Because of this progress, our valuation increased from $2M to $5M.

At this stage we move from Seed to Series A. Instead of raising a small bridge to survive, we are now raising $2M to scale the business, hire more team members, and expand marketing and product.

We keep the 15% option pool in place for future hires, so we are ready to attract strong talent as we grow.

What the Series A chart shows

The big circle now represents a $7M post-money valuation, which is our $5M pre-money value plus the new $2M investment.

• The founders' combined percentage is smaller than before, but the dollar value of their shares is much higher because the company is now worth $7M post-money instead of $2.2M.
• The new Series A investor owns about 28.6% in exchange for the $2M investment.
• The option pool remains at 15% for future employees.
• Earlier seed investors appear as a smaller slice carried forward.

Overall, the chart makes one key point very clear: founders own a smaller percentage over time, but they own a much more valuable company.

Try the calculator yourself

If you want to model your own rounds, use the Bowora dilution calculator. You do not need to log in, we do not store your data, and if you want to keep your results you can take a screenshot.

For deeper dives, read option pool dilution explained, founder ownership after seed and Series A, and SAFE vs priced round dilution.

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