A simple runway estimate divides available cash by steady net monthly cash burn. Use it as a planning scenario with explicit assumptions, not as a prediction of survival or a substitute for a dated cash-flow plan.
Establish what cash is genuinely available
Begin with a date and a clearly defined pool of cash. Money held for a restricted purpose, an uncertain receivable or an expected financing event should not silently be included as cash available for ordinary operations. Keep all inputs in the same currency; a runway worksheet does not perform currency conversion simply because it displays a currency symbol.
Reconcile the starting amount with the relevant records and note significant commitments. A single balance can be technically correct while still giving an incomplete view of the choices available. The useful question is not only “how much is there?” but also “what claims on that cash have already been made?”
Calculate a steady-state illustration
Define the monthly cash outflows and cash inflows used in the model. Net burn is the excess of the included outflows over the included inflows. If the result is positive, divide available cash by that amount to calculate a steady-state number of months.
Explain your definition beside the result. Customer cash received is different from recognised revenue, signed contract value or sales pipeline. Financing receipts should normally be shown separately from customer demand in a planning discussion. Consistent labels help a reviewer understand what the figure does and does not represent.
Put irregular payments back on the calendar
The simple division assumes the cash pattern remains unchanged. Many real obligations do not behave that way. Annual renewals, deposits, tax payments, equipment purchases and late customer collections can create an earlier cash pressure point than an average suggests. Requirements and accounting treatments vary, so obtain qualified support for consequential financial decisions.
Create a short dated schedule for material receipts and payments. When a date is uncertain, show that uncertainty rather than assigning a convenient precise day. The schedule should complement the simple estimate, not be forced to reproduce it. A mismatch is often the most useful part of the exercise.
Use scenarios to preserve decision time
Choose a small number of plausible changes: a customer paying later, a planned commitment happening sooner or a slower start to new sales. Recalculate the cash path and identify when a response would need to be considered. Do not label one scenario “safe” unless the evidence supports that language.
A response might involve changing scope, delaying a discretionary commitment or discussing alternatives with appropriate advisers. Those choices have their own consequences. The worksheet should make a conversation possible earlier; it should not automatically prescribe a financing product or treat hoped-for investment as committed cash.
Review the inputs when conditions change
Assign an owner and an update rhythm appropriate to the business. A number copied into a presentation can become stale quickly if collections, staffing or supplier commitments change. Retain the previous assumptions long enough to explain what moved between reviews.
The most useful output is a brief showing the starting date, available cash, burn definition, major exceptions and the next decision window. A decimal place adds little value if these foundations are unclear.
Illustrative worked example
A fictional scenario to explain the method, not a customer result or a market benchmark.
An illustrative business has $120,000 available. It expects $30,000 in monthly operating cash payments and $20,000 in customer receipts. Under those assumptions, net burn is $10,000 and the simple runway estimate is twelve months: $120,000 divided by $10,000.
A $25,000 annual payment is due next month. The team adds that payment to a dated schedule instead of hiding it inside a smooth monthly average. It also tests what happens if a customer receipt arrives thirty days later than planned. Neither case predicts the future; each exposes a timing question the steady-state calculation misses.
The team records the assumptions, asks its finance adviser to review material obligations and chooses a review date before making another significant commitment. These figures are fictional arithmetic examples, not a recommended cash reserve, forecast or financing strategy.
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A practical next-step checklist.
- Use a dated cash balance and one consistent currency.
- Distinguish customer receipts from revenue, pipeline and financing.
- Show irregular obligations in a dated cash schedule.
- Review scenarios and decision timing with appropriate financial support.
Common questions.
What if the business has no net cash burn?
The steady-state division no longer gives a meaningful finite runway. You still need to inspect payment timing, restricted funds and changes in future cash flows.
Does a twelve-month estimate mean the business is financially secure?
No. It reflects the stated steady-state assumptions. Demand, collection timing, obligations and other conditions can change, and the calculation does not establish overall financial health.
Further reading & source context.
These primary references provide background. They are not evidence for the fictional example above and do not endorse AccelerateLink.
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