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Raising a round? See what you own after it.
Enter the percentage you own, the investment and the pre-money valuation. The Dilution Calculator returns the investor's stake and yours after the round. Free to use.
Post-money valuation
$5,000,000
New investors own
20.0%
Your ownership after
64.0%
You give up 16.0% of the company
A valuation that sounds right still costs ownership you did not plan for
Picture this. You agree a round at a valuation you like. You are not sure of your own cap table, so nobody checks the arithmetic. The investor's 20% looks small. A second round later, you own barely half of the company you started.
What you enter and the two stakes you get back
Your stake today.
The percentage you own before the round.
Investment.
The money the investor puts in.
Pre-money valuation.
What the company is worth before that money lands.
Result.
The investor's stake and your stake after the round.
Post-money = pre-money + investment. Investor stake = investment ÷ post-money. Your stake after = your stake before × (1 − investor stake).
Worked example: two rounds at 20%
Assumptions: you own 80% today, no option pool, no SAFEs outstanding, and every share issued in the round goes to the investor.
Round 1. $1,000,000 at a $4,000,000 pre-money valuation.
Post-money:
$4,000,000 + $1,000,000 = $5,000,000
Investor:
$1,000,000 ÷ $5,000,000 = 20%
You:
80% × (1 − 0.20) = 80% × 0.80 = 64%
Round 2. $2,000,000 at an $8,000,000 pre-money valuation.
Post-money:
$8,000,000 + $2,000,000 = $10,000,000
Investor:
$2,000,000 ÷ $10,000,000 = 20%
You:
64% × 0.80 = 51.2%
Round 2 doubled the valuation and still took 20%, because the raise doubled too. Two rounds cost you 80% − 51.2% = 28.8 points of ownership.
A starting point for the conversation. Not legal or tax advice.
Where the Dilution Calculator stops
- It does not add an option pool. A pool created before the round dilutes you further. Size it with the ESOP Calculator.
- It does not convert SAFEs. Check those with the SAFE Calculator.
- It shows your stake, not every holder's. For each holder, use the Cap Table Simulator.
Run the round on your real cap table
Your stake today is a guess until it comes off a ledger. BildrX works dilution out from yours. With round modelling, price a round from pre-money, investment and pool size, and preview the dilution for every holder before anything is issued. The model stays read-only until you commit. Pro saves unlimited round scenarios, so the second round sits next to the first.
What's free, what's Pro
Free records what you have already issued. Pro models the round on your real holders and adds the exit waterfall. Compare the plans on pricing.
Cancel Pro anytime. Downgrade and nothing is deleted or hidden.
Type your stake, the investment and the pre-money above, read the dilution, then model the same round on your cap table.