Bootstrapped Runway Calculator

How to use it

1. Enter your personal savings (liquid cash available to fund your living expenses during the bootstrapping period) and your monthly living expenses at a sustainable austerity level. If you have side income from a day job, freelance work, or consulting, include that amount because it directly extends your runway by reducing the rate at which savings deplete. The concept of 'ramen profitability,' coined by Paul Graham of Y Combinator, means your business revenue covers your bare-minimum personal expenses, making you financially self-sustaining even if the business is not yet covering its own costs. For bootstrapped founders, the distinction between ramen profitable and fully profitable is critical: ramen profitability buys you unlimited time to grow, while running out of personal savings before reaching it forces either returning to employment or raising external funding, both of which fundamentally change the nature of the venture.
2. Enter your current monthly recurring revenue (MRR), your projected monthly MRR growth rate, and your monthly business operating costs (hosting, SaaS tools, contractor payments, marketing spend). The monthly growth rate is the single most important lever in the entire model because compound growth is exponential: at 5% monthly growth, MRR doubles every 14 months; at 10% monthly growth, it doubles every 7 months; at 15%, every 5 months. The difference between 5% and 10% monthly growth on a $1,000 MRR starting point is the difference between $3,200 MRR after 24 months versus $10,000 MRR after 24 months. Real growth is rarely smooth month-to-month, but the compound average growth rate is what determines whether you reach profitability before savings run out.
3. Read the four summary metrics that define your bootstrapping trajectory: personal runway in months (how long your savings last at your burn rate), the month at which you reach ramen profitability (MRR covers personal expenses net of side income, before business costs), the month at which you reach full profitability (MRR covers both business costs and personal expenses without touching savings), and the break-even MRR target (the specific MRR number you need to sustain indefinitely). These four numbers tell the complete story: if ramen profitability arrives before your personal runway expires, you have a viable bootstrapping path. If it does not, you need to either extend runway (reduce expenses, add side income), accelerate growth (improve product-market fit, distribution, or pricing), or acknowledge that the current trajectory requires outside funding or a strategic pivot.
4. Read the savings vs MRR chart, which plots your savings balance and projected MRR month by month. It reveals the critical moment: when your declining savings curve and your rising MRR curve cross, that intersection is your financial independence point as a bootstrapped founder. If the MRR curve crosses the break-even threshold before the savings curve hits zero, you have a viable path. If savings reach zero first, the gap between the two curves at that point represents the additional funding or income needed to bridge to profitability. Conservative planning and side income are the two tools that reduce this timing risk.
5. Re-run the calculator with different growth rate and side income scenarios to understand the sensitivity of your plan to realistic variations. The difference between 5% and 10% monthly growth can be years: a founder with $50,000 in savings, $4,000/month in expenses and $500 MRR has about 15 months of runway at 5% monthly growth, but MRR does not cover expenses until month 43, more than two years after the savings run out. At 10% growth, runway stretches to about 19 months and MRR covers expenses in month 22, still about 3 months short. Adding $2,000/month of side income means the savings are never exhausted in either case, and MRR closes the remaining $2,000 gap by month 29 at 5% or month 15 at 10%. These scenarios illustrate why the bootstrapping community emphasizes maintaining income sources during the early growth phase rather than going all-in prematurely.

Questions people usually ask

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Use it from code

The same calculation as a JavaScript module you can import. It runs where you import it, with no request, key or rate limit.

import { compute } from "https://aibizhub.io/engines/bootstrapped-runway-calculator.js";

Input and output contract, TypeScript types and the guide for agents.