See how many months of cash your startup has left, based on your bank balance and how much you spend each month.
Total available cash, including any committed but undrawn funding.
Cash out minus cash in each month. If you are profitable, your runway is effectively unlimited.
Use a positive number if burn is rising each month as you hire, or a negative number if you are cutting costs. Leave at 0 for flat burn.
How this works
With flat burn, runway is simply cash divided by net monthly burn. So £250,000 in the bank against £30,000 a month gives about 8.3 months.
If you set a burn change, the calculator steps month by month, adjusting burn by that percentage each month and subtracting it from cash until the balance hits zero. This is closer to reality when you are scaling spend or tightening up.
Assumptions: figures are pre-tax cash movements, your latest months are a fair guide to the future, and no new funding lands. Runway is a planning estimate, not a forecast. Most UK founders aim to start raising with 6 to 9 months of runway left, because a round commonly takes 3 to 6 months to close.