Growth Runway Extension Simulator
See how many extra months of runway an efficiency gain buys you.
Trimming burn 20% buys about 5.4 more months, often the difference between raising on your terms and raising on theirs. Efficiency extends runway faster than new revenue at this stage.
Runway assumes flat revenue. Growing revenue extends it further, but efficiency gains are within your control today, new revenue isn't.
About this calculator
Founders usually only ask "how much runway do we have" when the number is already getting uncomfortable. This tool flips the question: instead of a static count of months, it shows how much runway an efficiency gain, cutting a burn line, renegotiating a tool contract, tightening headcount, actually buys you, so a cost review reads as extra time on the clock rather than an abstract savings percentage.
How to use it
- Enter cash in bank, gross monthly burn, and monthly revenue to establish where you stand today.
- Enter the burn reduction from efficiency work as a percentage, this is the gross-burn cut you believe is achievable through cost discipline, renegotiation, or productivity gains.
- Compare runway today against runway after optimizing, and read off the months gained.
- Check the new net burn per month figure, if it turns zero or negative the model treats you as cash-flow positive with effectively indefinite runway.
Methodology
Net burn today is gross monthly burn minus monthly revenue. Runway today is cash in bank divided by that net burn, in months, or effectively infinite if revenue already covers burn.
The new gross burn applies your efficiency percentage as a straight cut: gross burn × (1 − reduction%). New net burn is that reduced gross burn minus the same monthly revenue, and new runway is cash divided by the new net burn.
Months gained is simply new runway minus current runway. Because runway is cash over a smaller denominator, even modest burn cuts produce disproportionately larger runway gains, the math rewards efficiency more than the percentage cut alone suggests.
The model holds revenue flat on purpose. Growing revenue would extend runway further still, but revenue growth isn't fully within your control on a given month, cost discipline is, so this tool isolates the lever you can pull today.
FAQ
Runway is cash divided by net burn, not gross burn. If revenue already offsets some of your burn, cutting gross burn shrinks the net-burn denominator by a larger percentage than the cut itself, so runway extension outpaces the raw burn reduction.
Anything you can point to concretely: a renegotiated vendor contract, a tool consolidation, a hiring freeze, or cutting an underperforming channel. 10-20% is a common range for a focused cost review; above 30% usually means structural changes like layoffs, model those separately since they also affect revenue.
It means net burn after the cut is zero or negative, monthly revenue now covers monthly costs. At that point runway stops being a countdown and becomes indefinite, which is a fundamentally different negotiating position when you eventually do raise.
No, treat it as a quick gut-check for how much a specific efficiency initiative is worth in runway terms before you invest time building it into a full 13-week cash flow or board model.