How long will your cash last?
Start with current inputs. Add a separate hypothetical scenario. See what changed and why.
Current inputs
Enter the cash and monthly assumptions you want to use as the baseline. Blank fields are treated as zero.
Do not enter invoiced or expected revenue as though it has already been received. This public calculator uses the cash-in assumption entered here.
Hypothetical adjustments
These toggles create a separate scenario. They do not rewrite the current inputs.
Custom hypothetical monthly expense
Current-input estimate
Estimated result
Current-input estimate: 16.1 months. Monthly net burn $31,000.
Estimated runway
16.1 months
Estimated cash-out date
January 2028
Estimated monthly net burn
$31,000
Starting cash
$500,000
+ Modeled inflows
$25,000/mo
− Modeled outflows
$56,000/mo
± Hypothetical changes
None applied
→ Estimated runway
16.1 months
This calculator uses the values entered here. Runway is a planning signal, not a guarantee, and the calculation does not recommend a hire, cut, or customer decision.
RunwayCal keeps reviewed current context separate from hypothetical scenarios so the assumptions behind each result remain visible.
Explore ScenariosA headline runway estimate divides starting cash by modeled monthly net burn. It is only as useful as the cash-in and cash-out assumptions behind it.
Use the current-input result as a baseline. Scenario toggles remain hypothetical and appear as a separate path, so a planned hire, cost change, or cash-inflow assumption never presents itself as recorded reality.
RunwayCal keeps reviewed current context separate from hypothetical scenarios and makes the assumptions behind each result available for human review. Runway is a planning signal, not a guarantee.