How do founders actually calculate runway without a spreadsheet?

Cash, burn, months. That is the whole formula. Spreadsheets hide the date.

How I have seen it work:

1. Cash is the bank balance today. Not the round that is almost closed

2. Burn is last month's real spend minus real revenue. Net, not gross

3. Divide. Write the month the cash hits zero

4. Recalculate next month. Burn creeps

Round Funded keeps those three numbers in one place so the runway is a date, not a tab.

https://www.roundfunded.com/en/t...