Startup Runway Calculator
Project how long your cash will last, accounting for revenue growth and expense changes over time.
Inputs
Scenario Modeling
Results
Months of Runway
16
Cash runs out August 2027
Cash-Zero Date
August 2027
Current Net Burn
$35,000
per month
Cash at Month 6
$292,493
Cash at Month 12
$97,005
Cash Balance Projection
How it works
Runway is the number of months until your business runs out of cash, accounting for both revenue and expenses. Unlike a simple 'cash ÷ burn rate' calculation, this tool models revenue growth and expense changes over time, giving you a much more realistic projection.
The formula
Why it matters for your business
Runway determines when you need to fundraise, cut costs, or become profitable. Most startups that die do so because they run out of cash — not because the idea was bad. Knowing your runway with realistic growth assumptions is the difference between a planned pivot and a panic.
Pro tip
Most founders calculate runway with flat expenses, but expenses creep up 3-5% monthly as you hire and grow. Use the expense growth slider to model this — the difference in runway can be 2-3 months. That's often the difference between closing a funding round and running out of money.
Get deeper insights with James FP&A
These calculators are just the start. Connect your accounting data and get automated financial analysis, forecasting, and real-time dashboards.