How to use it
- Enter current cash using the same period and unit as the other inputs.
- Enter monthly cash outflows using the same period and unit as the other inputs.
- Enter monthly cash inflows using the same period and unit as the other inputs.
Business · Local-first · Beta
Runway Calculator
Estimate months of cash runway from current cash and monthly net burn.
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Trust record
Check the method before you rely on the result
- Method
- Current cash divided by monthly outflows less monthly inflows.
- Runway months = current cash ÷ (monthly outflows − monthly inflows)
- Effective period
- Formula-based; no statutory effective period
- Last verified
- 9 August 2026
- Review every 365 days
- Reviewer status
- Product and domain review: specialist approval not required
- Privacy
- Scenario inputs and results stay in this browser. Values are not sent to analytics, a backend, a URL or a log. They are not saved by default; an explicit related-tool transfer is kept only in this tab until it closes or you replace it.
Important limitations
- The model assumes a stable monthly pace.
- It does not model funding, working-capital timing or step changes.
Browse Business · Methodology · Sources
A quick guide
Use the number with context
The answer is only useful when you know what it includes and what it leaves out.
Formula
Runway months = current cash ÷ (monthly outflows − monthly inflows)
Runway is a scenario estimate, not a prediction of business survival or fundraising success.
Make it concrete
Worked example
₹9,00,000 cash and ₹2,00,000 monthly net burn produce 4.5 months of runway.
Boundaries
What this tool does not assume
Limitations
- The model assumes a stable monthly pace.
- It does not model funding, working-capital timing or step changes.
Edge cases
- If net burn is zero or negative, the result says no burn rather than inventing an infinite forecast.
- Zero cash produces zero runway when burn is positive.
Last reviewed 9 August 2026 · Formula version 1.0
Method & sources
How this result is grounded
The formula is deterministic and runs in your browser. Read the reference below for the method used by this tool.
- Business economics methodology v1
KarobarKit controlled methodology · authoritative reference · Checked 9 August 2026
Supports: business economics formulas · rounding and scope limitations · estimate-only language
Questions
Frequently asked
Is runway a guarantee?
No. It is a simple scenario based on current cash and the selected monthly pace.
Why does the tool say no burn?
Monthly inflows meet or exceed outflows, so this formula cannot produce a finite consumption period.
Keep going
Related tools
A related local-first tool for the next step.
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Source register checked 9 August 2026.