Runway
Cash runway is the time until available cash reaches zero under an explicit burn and income assumption. If costs are changing, a fixed cash ÷ burn estimate can be misleading.
Live model
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# Cash runway starting_cash = 30000 in usd monthly_burn = 2800 in usd monthly_income = 600 in usd net_burn = monthly_burn - monthly_income simple_runway_months = starting_cash / net_burn three_month_cost = net_burn * 3 cash_after_three_months = starting_cash - three_month_cost
Inputs
Method
net_burn = monthly_burn - monthly_incomesimple_runway = starting_cash / net_burnchanging-burn runway is found by projecting each month until balance ≤ 0Continuum keeps the authored source canonical. The full production template adds interpretation and a richer preview without hiding these relationships.
Worked example
The useful question is not only the depletion month. It is when to cut costs, replace income, or stop treating the current plan as safe.
Questions
Only when there is no income and costs are flat. With recurring income, use net burn. With changing costs or irregular cash events, project the balance over time.
The simple depletion case no longer applies because the modeled balance is not shrinking. Stress-test whether the income is durable instead.
Update whenever cash, recurring income, or the cost structure changes materially. During a constrained period, monthly review is often more useful than an annual budget.
Keep the reasoning
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