Most founders think runway is money in the bank divided by monthly spend. That number is a lie, and it is why teams get surprised three months early. Real runway accounts for the spend that has not hit yet: the annual contracts renewing, the hire starting next month, the taxes nobody budgeted. We rebuilt ours as a rolling thirteen week cash forecast, not a single divide. Every committed outflow goes in on the week it actually lands. Suddenly a comfortable eleven months became a nervous eight, and we raised earlier instead of scrambling. Cash in the bank is a photo. Runway is the movie. Forecast the outflows you have already promised, and you will never be surprised by your own bank account again.