Founder Runway Calculator
Before raising institutional venture capital or reaching ramen profitability, a founder’s true runway is often tied to their personal bank account. Track your combined personal and business burn to know exactly how long you have to find product-market fit.
You are generating positive net cash flow of $4,000/month. Your cash balance is growing.
Projected Cash Remaining
Based on trajectoryProjected Cash Trajectory (24-Month Horizon)
Real-time projection showing monthly cash reserves over time.
“What If?” Scenario Modeling
Test how cutting burn, expanding sales, or raising capital extends your survival timeline.
Save $325/mo (new expenses: $6,175/mo)
Save $650/mo (new expenses: $5,850/mo)
Save $1,300/mo (new expenses: $5,200/mo)
How the Runway Calculator Works: Mathematical Model & Assumptions
1. Static Cash Runway Formula
For businesses with steady revenue and predictable overhead, runway is determined by dividing liquid cash reserves by net monthly cash deficit:
2. Gross Burn vs. Net Burn
- Gross Burn: Total cash disbursed each month (payroll, contractors, hosting, rent, utilities).
- Net Burn: Gross monthly expenses minus total monthly cash revenue collections.
- Break-Even: When Net Burn $\le$ $0$, cash runway is mathematically sustainable or infinite.
3. Dynamic Growth Projections & Interpolation
When revenue growth or expense inflation rates are enabled, the engine calculates month-by-month compound flows up to 60 months:
We linearly interpolate the exact day/fraction when cash reaches $0, avoiding arbitrary rounded whole months.
4. Client-Side Privacy Guarantee
Every financial computation executes exclusively inside your local browser runtime. No financial balances, revenue figures, or payroll numbers are sent to any remote server or database.
Major Burn Drivers for Founders & Co-Founders
Founder Personal Living Expenses
Mortgage/rent, groceries, health insurance, and debt service while drawing zero or nominal founder salary.
MVP Hosting, Domains & API Services
Server instances, third-party authentication, LLM keys, and development tool licenses.
Legal Incorporation & Patent Filings
Delaware C-Corp incorporation, IP assignment, founder equity vesting agreements, and trademark searches.
How to Extend Founders & Co-Founders Runway
Preserve Advisory / Consulting Hours
Dedicate 10 hours per week to high-rate consulting to cover personal baseline expenses while building your product.
Leverage Startup Accelerator Perks
Apply for AWS Activate, Google Cloud for Startups, and HubSpot credits to secure up to $100k+ in free tooling.
Validate Demand with Pre-Orders
Sell founding member lifetime deals or annual pre-orders before writing complex production code.
Worked Calculation: Solo Technical Founder Building Dev Tool
With $60,000 in founder savings, $2,500 monthly beta subscription revenue, and $6,500 in combined living and server expenses, net burn is $4,000/month. The founder has 15.0 months of runway ($60,000 ÷ $4,000) to iterate and reach product-market fit.
Frequently Asked Questions: Founders & Co-Founders Runway
Common questions and financial benchmarks for founders & co-founders.
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