I was terrified of quitting my job to build a SaaS full-time. So I built a math engine to tell me exactly when it's safe.

Title: I was terrified of quitting my job to build a SaaS full-time. So I built a math engine to tell me exactly when it's safe.

Hey everyone,

Quitting your 9-to-5 to go all-in on your startup is terrifying.

If you scroll through Twitter or Reddit, the advice is always "just take the leap!" But if you have rent, a mortgage, or a family, leaping blind without a financial safety net is just stupid.

I was doing the math in Excel every week:

• If my MRR grows by 5% a month...
• And my living expenses stay at $3,000...
• How many months until my savings hit exactly $0?

It was stressful to calculate manually, so I spent the weekend turning my spreadsheet into a visual calculator:
👉 The Quit Your Job Simulator

How it works (no BS, pure math):

1. You put in your current savings, monthly living expenses, and current side-hustle MRR.
2. You estimate your realistic monthly MRR growth percentage.
3. It instantly calculates your Runway Extinction Date (the exact month you run out of cash if you quit today).
4. It graphs the intersection where your MRR finally overtakes your living expenses.

I made it completely free, no sign-ups, no ads. Just a tool for founders to stop guessing and start measuring their actual risk.

I’m curious though—for those of you who have already quit your jobs:
What was your threshold? Did you wait until your MRR completely replaced your salary, or did you just jump ship when you had 12 months of savings? Would love to hear your "leap" stories!