SaaS runway calculator.
Five numbers you already know. See how many months you have, when cash runs out, your burn multiple, and whether growth gets you to break-even first.
How this calculator works
It projects your business month by month. Revenue grows at your MRR growth rate, expenses grow at your expense growth rate, and the difference comes out of cash. Runway is the number of months until cash would go below zero. If revenue overtakes expenses first, you are default alive: growth gets you to break-even before the money runs out.
It treats MRR as cash collected each month. If many of your customers prepay annually, your real cash timing is lumpier; see cash vs. MRR for why that matters.
How to read the results
- Under 12 months: raise or cut within the next quarter. Raises take months from first meeting to cash.
- 12 to 18 months: start preparing a raise now, while you still have leverage.
- 18 months or more: healthy. Keep an eye on the burn multiple as you spend into growth.
How is cash runway calculated?
The simple version divides cash by monthly net burn. This calculator goes further: it grows revenue and expenses month by month at the rates you enter and finds the month cash runs out, or the month the company becomes cash-flow positive.
What is a good runway for a startup?
Most investors expect 18 to 24 months after a raise. Under 12 months, fundraising or cost decisions become urgent, because a raise typically takes several months from first meeting to cash.
What does default alive mean?
A company is default alive if, at current growth and spending, revenue overtakes expenses before the cash runs out. The term comes from a 2015 essay by Paul Graham.
Is my data stored?
No. Everything is calculated in your browser. Nothing you enter is sent to Prinsee.
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