# Cash Burn and Runway Calculator — United States

> Estimate time to a chosen cash reserve under constant cash inflow and outflow, using cash rather than accounting profit. USD planning view; stated limitations apply.

Page: https://askcalculators.com/us/runway/
Definition: https://askcalculators.com/us/runway/definition.json
JSON Schema: https://askcalculators.com/us/runway/schema.json
Version: 20.16.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/us/runway/?cash=300000&minimumReserve=50000&monthlyCashOut=50000&monthlyCashIn=30000&oneOffOutflow=0

## Inputs
- cash: Unrestricted cash currently available; type=money; required; default=300000; min=0; max=1000000000000
- minimumReserve: Cash reserve not available for normal burn; type=money; required; default=50000; min=0; max=1000000000000
- monthlyCashOut: Recurring monthly operating cash outflow; type=money; required; default=50000; min=0; max=1000000000000
- monthlyCashIn: Recurring monthly operating cash inflow; type=money; required; default=30000; min=0; max=1000000000000
- oneOffOutflow: Known immediate one-off cash outflow; type=money; required; default=0; min=0; max=1000000000000

## Outputs
- usableCash: Cash available above reserve after one-off outflow; format=currency
- netBurn: Monthly net cash burn; format=currency
- runway: Months until selected reserve threshold; format=number; primary

## Formula
runway = maximum(0, cash − reserve − immediate one-off outflow) ÷ positive monthly net cash burn.

Inputs are converted to canonical units before evaluating this stated formula.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.