I built a free runway calculator so I never run out of cash again

As a bootstrapped founder, my biggest fear isn't competition — it's waking up one day and realising the bank account is empty.

I used to track cash in a notebook. Then I'd forget to update it. Then I'd panic at month-end and have no idea if I had 3 months or 8.

So I built a simple Google Sheet that answers exactly one question:
When will I run out of money?

Here's how it works:

1. Enter your current cash balance
2. Enter your monthly revenue (MRR + one-off)
3. Enter your monthly expenses (hosting, payroll, tools, marketing, misc)
4. Read your runway in months and your burn-down date

The sheet has three tabs:

• Dashboard: instant runway + color alert
• 12-Month Projection: month-by-month cash flow
• Scenarios: best/base/worst case (MRR growth or decline)

I've pre-filled it with realistic data ($2k MRR, $8k burn) so you can see it work before typing your own numbers.

The formulas are all visible — no macros, no hidden cells. You can trust every calculation.

I put the full template on Gumroad for $29 (it saves me hours of manual tracking each month). But today I want to share a free version: a simplified single-tab calculator that gives you the same burn-down date.

👉 Download free runway calculator (single tab)

If you find it useful, upgrade to the full 3-tab version with scenarios and pre-filled data. Either way — stop guessing. Know your date.