startzero.money

Runway calculator

How many months your cash lasts, and whether growth gets you to break-even first.

Your numbers

$
$
$
%/mo
%/mo
Runway at today’s burn
5.3 months
Burning $1,900 a month
With growth, cash runs out
Month 6
Revenue covers costs
Month 23

Cash in the bank

−$20.0K−$15.0K−$10.0K−$5,000$0$5,000$10.0KM1M4M7M10M13M16M19M22Runs out

Revenue and costs

  • Revenue
  • Costs
$0$1,000$2,000$3,000$4,000M1M4M7M10M13M16M19M22Break-even
How it’s calculated
  • runway today = cash ÷ (monthly costs − monthly revenue)
  • each month: cash = cash + revenue − costs; then revenue × (1 + revenue growth), costs × (1 + cost growth)

See the whole picture

Build a full plan free: cash, break-even, your workload, a lifetime-deal planner, funding options and AI-drafted proposals, all from one engine.

Guides that use this calculator

Questions

What is a healthy runway?

Many founders aim for at least 12 months, and treat under 6 months as urgent. With zero cash, pre-sales, service income and lifetime deals can extend runway without giving up equity.

Should I count revenue growth?

Use growth you can back up, such as your last three months. The calculator shows both today’s runway and the one with growth, so you can see how much depends on it.