Understand your startup equity before it's too late
Interactive calculators that turn confusing dilution, SAFE notes, and runway math into beautiful visualizations. See exactly what happens to your ownership.
See your dilution in real-time
Drag the sliders and watch what happens to your equity as you raise money.
Equity Dilution Simulator
Six calculators, one clear picture
Equity Dilution Simulator
See how your ownership changes across multiple funding rounds. Visualize pre-money and post-money valuations, investor shares, and founder dilution.
Runway Calculator
How many months until you run out of cash? Factor in revenue growth, burn rate changes, and one-time expenses to plan your next raise.
SAFE Note Converter
Understand what your SAFE converts to. Calculate conversion price, share count, and investor ownership for cap and discount scenarios.
CAC/LTV Analyzer
Are your unit economics working? Input your acquisition costs, churn rate, and revenue per customer to see if your business model is sustainable.
Vesting Visualizer
Map out your vesting schedule with cliff, acceleration triggers, and early exercise options. See exactly when you earn each slice of equity.
Cap Table Builder
Build your cap table from scratch. Add founders, investors, option pools, and SAFEs. See ownership at every stage of your company's journey.
From confused to confident in 3 steps
Pick a Calculator
Choose from 6 startup-specific calculators. Each one solves a specific math problem founders face.
Adjust Your Numbers
Input your real numbers with intuitive sliders and fields. Watch the visualization update in real-time.
Understand & Share
Get instant clarity on your equity situation. Save scenarios, compare side-by-side, and share with cofounders.
Start free, upgrade when you need more
Free
- All 6 calculators
- Basic inputs & outputs
- Interactive charts
- Save scenarios
- Export PDF/PNG
- Side-by-side comparison
Pro
- All 6 calculators
- Advanced inputs & outputs
- Interactive charts
- Save unlimited scenarios
- Export PDF & PNG
- Side-by-side comparison
- Multi-round simulation
- SAFE conversion waterfall
Team
- Everything in Pro
- Share with up to 5 members
- Collaborative editing
- Embeddable charts
- Custom branding on exports
- 15+ round simulation
- Priority support
Stop guessing about your equity
Join thousands of founders who use FounderMath to understand their ownership, plan their raises, and negotiate better deals.
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