Runway Calculator for Solo Founders
Free founder runway calculator for bootstrapped founders. See how many months you can operate before savings run out, and when you reach break-even at your current MRR — with optional growth modeling.
What is founder runway?
Founder runway is how long you can keep operating before cash runs out. For a bootstrapped solo founder, that usually means personal savings divided by the gap between what you spend each month and what your product earns.
Unlike venture-backed startups measuring runway in millions, indie founders often track runway in thousands — rent, food, Stripe fees, and a Cursor subscription. Knowing that number honestly is the first step in deciding how long you can bootstrap and whether you need revenue before a hard deadline.
How to use this calculator
Enter your current savings and total monthly expenses — include living costs if the business does not pay you yet. Add your current MRR, even if it is zero.
The calculator shows net monthly burn, runway in months, and the MRR you need to break even. Optionally add monthly MRR growth to see when you might reach break-even and how savings deplete month by month.
Change any input to model quitting your job, cutting expenses, or landing your first paying customers. Copy the link to save or share your scenario.
Runway milestones for bootstrapped founders
At $0 MRR, runway is purely savings divided by expenses — the reality most founders face during validation. Knowing how long you can bootstrap answers one of the first questions solo founders ask before they quit a day job.
At $500–$1,000 MRR, you have proof of demand but usually not enough to cover costs. Runway extends, but you are still burning cash — the gap to break-even shows how much revenue is left to find.
Break-even is when MRR covers expenses. After that, every new customer adds to profit instead of extending survival. Many solo founders treat break-even as the milestone that turns a side project into a sustainable business.
Frequently asked questions
How do I calculate runway as a solo founder?
Divide your cash savings by your net monthly burn. Net burn is monthly expenses minus current MRR. If you have $10,000 saved and burn $2,000 per month after revenue, your founder runway is five months. This solo founder runway math is the same whether you are bootstrapping a micro-SaaS or still pre-revenue.
What is a good runway before quitting my job?
Most bootstrappers want at least six to twelve months of personal runway before going full-time, plus enough savings to cover business costs while MRR is near zero. There is no universal number — it depends on your expenses, how fast you can validate, and whether you have a partner income. Use this startup runway calculator to model your specific numbers instead of copying someone else's tweet.
How does MRR affect runway?
Every dollar of MRR reduces your net burn by one dollar. At $0 MRR your runway is savings divided by full expenses. At $1,500 MRR with $3,000 expenses, you only burn $1,500 per month — doubling your runway. That is why pricing and early customers matter even before you are break-even.
When do I reach break-even?
You reach break-even when MRR equals or exceeds monthly expenses. Until then, you are subsidizing the business from savings or other income. If you add MRR growth each month, the months-to-break-even field shows how long until revenue covers costs at your current growth rate — a simple break-even calculator SaaS founders use before hiring or quitting a day job.