10 months is the example result. Read it using the units and relationship stated below.
SaaS Runway uses cash available, monthly burn.
Separating growth, retention and subscription capacity
For saas runway, the relationship is Result = (([Cash available]) ÷ ([Monthly burn])). The amount depends on the supplied cash available, monthly burn, rather than a live market price or a value imported from another record. Recurring revenue should be compared across the same starting cohort. Expansion, contraction and churn change retention in different directions. Adding new customers to a retained-customer calculation can conceal losses in the original population.
Source and result record
For saas runway, retain Cash available, Monthly burn together with the output. Record the date of the source values and the unit convention used in the form. That record separates a change in the underlying case from a change in how the information was entered. A saved result without its source values cannot show which assumption produced it.
Example with the supplied inputs
Cash available: 500000; Monthly burn: 50000. Result: 10 months. The values are illustrative.
Compare one changed input
Cash available changes from 500000 to 550000. The result becomes 11 months. All other inputs remain fixed.
Calculation rule
Result = (([Cash available]) ÷ ([Monthly burn]))
Inputs and output
| Input | Example value | Entry convention |
|---|---|---|
| Cash available | 500000 | Use cash available on the currency and period basis shown by the formula. Keep gross amounts, net amounts and unit amounts distinct; the page does not fetch a price or exchange rate. |
| Monthly burn | 50000 | Use the source quantity represented by monthly burn. Keep the counted population fixed and avoid mixing a unit value with a period total. |
Output: 10 months is the example result. Read it using the units and relationship stated below. Use the formula to distinguish a cash amount, count, percentage or ratio.
How to use the page
Collect the inputs
Gather Cash available, Monthly burn. Use one period and the units shown in the form.
Run the calculation
Enter the values and select the action. The calculation rule above explains how the inputs produce the result.
Compare a scenario
Change Cash available on its own, keeping the other inputs fixed. Read both results before changing another assumption.
Worked example
With the example inputs listed above, the result is 10 months.
Change Cash available from 500000 to 550000 while keeping every other value fixed. The result becomes 11 months. This comparison isolates that input; it does not forecast how other variables will respond.
Check the stated formula, units and limits before using the result in a decision.
Keep the displayed formula, input units and model scope with the result. Corrections or questions can be sent through the request section on this page.
Content updated: October 11, 2026