Personal runway needed before quitting to start a business.

Starting a business usually means a period before the business generates enough income to replace your salary. That gap must be covered from personal savings — separate from business capital. Underfunding this runway is one of the most common reasons new businesses fail before reaching profitability.

Personal runway needs to covermonthly living costs during the pre-income period, a buffer for the runway exceeding plan (businesses almost always take longer to profit than founders expect), and non-negotiable personal costs like insurance, minimum debt payments, family obligations.

Separately from personal runway, the business needs startup capital: equipment, legal setup, inventory, marketing, initial team, software. This calculator focuses on the personal side — what it helps to save as an individual before quitting your job. Business capital is a separate plan.

Typical numbers: 12-18 months personal runway for a service business (consulting, coaching, freelance work). 18-24 months for a product business. 24-36 months for a tech startup that needs to build before selling. Under-planning is dangerous; over-planning is prudent.

How to use it

Input personal monthly living cost, expected months of runway needed, any upfront startup costs you're self-funding, and current savings toward the business. The tool shows target fund and gap.

What the result means

Target fund is what to have saved before quitting. Gap is what's left to save from now. Months to target (at current pace) shows when quitting becomes financially feasible — often longer than founders want, but realistic planning reduces risk of early failure from running out of money.

Planning tool, not financial advice.

A worked example

Try the defaults: monthly living cost of 3,000, runway months needed of 18, self-funded startup costs of 10,000, current savings of 15,000. The tool returns 64,000.00. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Monthly Living Cost, Runway Months Needed, Self-Funded Startup Costs, and Current Savings. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

The formula behind this

Target sums personal living costs (monthly × runway months) and upfront startup costs. Gap is target minus current savings. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

Using this to think, not predict

Financial plans are wrong by month six — new information arrives and reshapes the picture. The point of running projections isn't to be right in ten years; it's to be less wrong in the decision you're making this week.

What this doesn't capture

Real plans get re-run against new information every year or two. The result here is a reasonable direction, not a destination. Treat it as a starting point for thinking, not a commitment to a specific future.