Cash runway calculator
Runway is cash divided by net burn. Growing revenue extends it, and growing costs shorten it faster.
%
%
Runway at the current burn
13.3months
- Net monthly burn
- 45 000.00
- Gross monthly burn
- 90 000.00
- Months to break even at these growth rates
- 12.1
- Monthly revenue in a year
- 113 317.66
- Monthly costs in a year
- 114 141.76
- Burn per unit of revenue
- 1.000
Show the working
- Cash in the bank = 600 000
- Monthly costs = 90 000
- Monthly revenue = 45 000
- Monthly revenue growth = 8
- Monthly cost growth = 2
- Net monthly burn = 90 000 - 45 000 = 45 000
- Runway at the current burn = 45 000 > 0 ? 600 000 / 45 000 : 0 = 13.3333
- Gross monthly burn = 90 000 = 90 000
- Months to break even at these growth rates = 8 > 2 && 45 000 > 0 ? log(90 000/45 000, (1+8/100)/(1+2/100)) : 0 = 12.1268
- Monthly revenue in a year = 45 000 * (1 + 8/100)^12 = 113 318
- Monthly costs in a year = 90 000 * (1 + 2/100)^12 = 114 142
- Burn per unit of revenue = 45 000 > 0 ? 45 000 / 45 000 : 0 = 1
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- runway = cash / (costs - revenue)
- break-even month = log(costs/revenue) / log((1+revenue growth)/(1+cost growth))
This holds the burn flat. Real runway shortens as hiring outpaces revenue, which is what the growth rows show.