1. Start with spendable cash, not optimistic receivables
Use cash you can actually access now. Do not automatically count unpaid invoices, hoped-for marketplace payouts or future sales as cash on hand.
2. Separate recurring costs from irregular costs
Write down the monthly costs that repeat reliably, then add a realistic allowance for software, contractors, ads, repairs, tax preparation or other business costs that do not arrive in a perfectly smooth pattern.
3. Use expected revenue conservatively
Runway changes dramatically when projected monthly revenue is optimistic. A useful workflow is to calculate at least a conservative case and a base case rather than one single number.
4. Pick a reserve floor
Runway to zero is often less useful than runway to a minimum reserve. Decide what cash amount you do not want normal operations to consume, then calculate how long the remaining usable cash covers the monthly shortfall.
5. Calculate the monthly gap
Monthly gap = recurring monthly costs minus expected monthly revenue. If revenue covers the costs entered, the simple model is cash-flow positive. If it does not, divide usable cash above the reserve floor by that monthly gap.
6. Recalculate when reality changes
A runway number becomes stale as soon as costs, cash or revenue materially change. Treat it as a review tool, not a permanent label for the business.
Run the numbers in the browser.
The free Creator Runway & Target Gap Calculator uses exactly this lightweight method.
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PAS-07 Creator Cashflow & Runway Planner adds scenario planning, revenue streams, expenses, runway/buffer checks and a dashboard.
Planning information only. This guide is not accounting, tax, investment, lending or insolvency advice.