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THE FEUTEX TOOLKIT

Operating Cash Runway with Reserve

Estimate runway after one-time commitments and a minimum cash reserve.

Finance workspace● Runs in your browser
01 Your input
02 Your result
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FormulaUsable cash = Math.max(0,v.cash-v.reserve-v.one_time) ; Net burn = v.monthly_outflow-v.monthly_inflow ; Runway months = Math.max(0,v.cash-v.reserve-v.one_time)/(v.monthly_outflow-v.monthly_inflow)
Sources and model references

Worked example

Inputs

Cash
200000 currency
Reserve
50000 currency
One time
20000 currency
Monthly outflow
40000 currency
Monthly inflow
30000 currency

Expected results

Usable cash
130000 currency
Net burn
10000 currency/month
Runway months
13 months

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter your own assumptions using a consistent currency and period.
  2. Review the scenario outputs and compare alternative inputs.
  3. Check the stated model limits before using the result in an operating plan.

Try this example

{
  "cash": 200000,
  "reserve": 50000,
  "one_time": 20000,
  "monthly_outflow": 40000,
  "monthly_inflow": 30000
}

Accuracy and scope

Deterministic planning scenario; inputs are assumptions, not forecasts. Excludes taxes, financing, legal requirements and costs not explicitly entered. Source explains the underlying planning framework; this specific scenario arithmetic is original.

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This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.