The Startup Runway Calculator tells you exactly how many months of cash you have — under your base case, an optimistic scenario, and a pessimistic one. Five input tabs, KPI dashboard, and up to 48 months of projections in a single Excel file.
Runway is simple to define and surprisingly easy to miscalculate. Here’s the formula, how to avoid the common errors, and how to build a scenario model that gives you a defensible number for investors and the board.
Burn rate is the single number that tells you how long your startup can survive. This guide walks through the gross and net burn formulas, shows you how to build a dynamic burn rate model in Excel with real cell references, and flags the mistakes that make most spreadsheet models dangerously optimistic.