Kiln & Co., a ceramics studio selling online, holds $48,300 in cash against a monthly burn of $6,900, with everything in it: rent, gear, software and the owner draw. That's 7.0 months of runway at the current burn. It's above the four-month line, so the owner can plan in seasons instead of weeks.
Runway = cash on hand ÷ monthly burn, using your heaviest recent burn month rather than your cheapest. The main runway guide has the full reasoning and what to do at each level, and the calculator runs it on your numbers in your browser.
The twist for Etsy sellers and makers
Inventory is cash wearing a costume. A materials buy converts runway into shelf stock, so count planned buys as burn in the month you place them, and remember December revenue lands after December bills.