Free tool
Burn rate calculator
Burn rate is how much cash a business loses each month. Net burn is the fall in your cash balance divided by the months it took; gross burn is everything you spent, divided the same way.
Calculate
Fill in the form and select Calculate. The result appears here and the page address keeps it, so you can share or bookmark it.
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The formula
Net burn = (cash at start − cash at end) ÷ months. Gross burn = total spending ÷ months. Runway = cash at end ÷ net burn.
Run it with curl
curl "https://app.superbooks.io/api/tools/burn-rate?cashStart=120000&cashEnd=90000&months=3"Questions
- What is the difference between net burn and gross burn?
- Gross burn is everything the business spends in a month. Net burn is what is left after revenue comes in: spending minus revenue, which is the same as the fall in your cash balance. Runway is worked out from net burn.
- Over how many months should I measure burn?
- Long enough to smooth out one-off bills, short enough to reflect how you spend now. Three months is common; the SuperBooks runway report uses the median of the last three full months.
- What does a negative burn rate mean?
- Your cash went up over the period: the business brought in more than it spent, so it is not burning cash and there is no runway limit at that pace.