The number every founder watches first.
Cash on hand, monthly expenses, monthly revenue, and how fast revenue is growing. We'll plot the next 60 months and flag the zero-line — so you know how long you have to figure things out.
Built and reviewed by Stephen Omukoko Okoth
Mathematical Economist · ex-Morgan Stanley FI · Equilar
Inputs
Cash position
Verdict
Out of cash in month 11.
Net burn $ 80,000/mo at flat revenue • 10 months flat runway.
The classic advice: raise when you have 9–12 months of runway left, because fundraising itself takes 3–6. Waiting longer means raising from weakness.
Result
Burn metrics
Net burn / month
$ 80,000
Flat runway
10 months
With growth
11 months
Trajectory
Cash over time
Common questions
What is cash runway?
How many months until your cash hits zero, given current burn and revenue. It's the most important number a startup founder watches.
Net burn vs gross burn — which one matters?
Net burn = cash out minus cash in. That's what runway is built on. Gross burn (total cash out) matters for cost-cutting decisions, but runway is set by net.
When should I raise?
The standard advice: raise when you have 9–12 months of runway left, because rounds take 3–6 months. If you wait until 3 months, you're fundraising from weakness.
What if revenue is growing?
Toggle the growth input. The calculator extends runway as monthly revenue ramps. Be honest about your growth rate — investors will model the conservative case anyway.