# Runway calculator

> Free cash runway calculator: cash in the bank, monthly spending and revenue give your net burn and the months until the cash runs out. No sign-up.

Canonical page: https://superbooks.io/tools/runway-calculator/

Runway is how many months your cash lasts at the current net burn: the cash in the bank divided by what you spend each month beyond what comes in.

Formula: Net burn = monthly spending − monthly revenue. Runway (months) = cash ÷ net burn.

GET https://app.superbooks.io/api/tools/runway

## Questions

### How is cash runway calculated?

Divide the cash you have by your net burn, the amount your spending exceeds your revenue each month. $90,000 of cash with $20,000 of spending and $8,000 of revenue a month is $12,000 of net burn, so 7.5 months of runway.

### What if my revenue is higher than my spending?

Then net burn is zero or negative and the business is not using up its cash, so there is no runway figure: at that pace the cash does not run out.

### How does SuperBooks calculate runway?

The runway report divides the cash in your connected bank accounts by the median monthly burn of your last three full months, and rounds down to whole months.