The Calculators
Every Founder Needs
Make critical decisions with clarity. Equity splits, dilution modeling, runway planning—all the math that keeps you up at night, simplified.
Essential Founder Tools
Every calculation runs in your browser. Your data stays on your machine.
Equity Calculator
Understand what your equity is actually worth. Model different exit scenarios and see your real upside.
When negotiating co-founder splits or evaluating your option package
Dilution Simulator
See how each funding round affects your ownership. Model multiple rounds before they happen.
Before taking investment to understand long-term ownership impact
Runway Calculator
Know exactly when you'll run out of cash. Plan fundraising timing with precision.
Monthly financial planning and deciding when to start fundraising
Unit Economics
Calculate LTV:CAC, payback period, and magic number. Prove your business model works.
Preparing for investor conversations and optimizing growth spend
Tools for Every Stage
From first idea to Series A and beyond
Pre-Seed
Understand how your first raise affects ownership and plan your cash burn.
Seed
Model Series A scenarios, prove unit economics, and manage burn rate.
Series A+
Optimize growth efficiency and plan future rounds.
What Founders Get
Instant Answers
No more spreadsheet gymnastics. Get answers in seconds.
Scenario Modeling
Model different outcomes before making decisions.
Investor-Ready
Know your numbers cold before every pitch meeting.
“Finally, equity math that doesn't require a finance degree.”
— Solo Founder, Pre-seed
“Helped me understand what my 0.5% offer was actually worth.”
— Early Employee → Founder
“The runway calculator saved me from panic fundraising.”
— Seed Stage Founder
Ready to Do the Math?
Join thousands of founders who make better decisions with PureBuild.
Explore All Tools