How to use this calculator
- Enter cash available, monthly cash outflow, monthly cash inflow.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Cash flow must be measured on a cash basis. If inflow covers outflow, there is no finite depletion runway under this model.
Worked example
With cash available = 100000, monthly cash outflow = 30000, monthly cash inflow = 10000, runway in months is approximately 5.
What the result means
This is a constant-burn scenario; collections, one-off costs and financing can change runway.
Common questions
How should I interpret runway in months?
This is a constant-burn scenario; collections, one-off costs and financing can change runway.
What should I check before using this result?
Cash flow must be measured on a cash basis. If inflow covers outflow, there is no finite depletion runway under this model.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.