Runway Extension Calculator
Extend your startup runway.
Calculate startup runway extension from cost cuts and revenue increases. Enter cash to see extended runway after cost reductions and revenue additions.
What this tool does
This calculator models how cost reductions and additional revenue extend a startup's operational runway. It takes your current cash balance, monthly burn rate, the percentage of costs you plan to reduce, and any new monthly revenue, then calculates your revised monthly burn and how many months of operation that cash now supports. The result shows both the new runway length and the additional months gained compared to your current trajectory. The most significant drivers are the size of your cost cuts and the magnitude of new revenue, though even modest changes can shift runway substantially. This is useful for modelling different operational scenarios—for instance, testing whether a planned cost restructure alone extends runway enough, or whether new revenue is required. The calculator assumes consistent monthly burn after changes and does not account for variable costs, seasonal fluctuations, or one-time expenses. Results are for illustration only and reflect the specific inputs you provide.
Enter Values
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Startup runway extension calculates how much longer cash lasts after cost cuts or revenue increases. Most startups facing fundraising difficulty need to extend runway from 6-9 months to 12-18 months to reach the next milestone. This tool models the impact of cutting burn and adding revenue on remaining months.
500k cash at 50k/month burn = 10 months current runway. Cut costs 20% (new burn 40k) + add 5k/month revenue = net burn 35k. Extended runway: 14.3 months. Gained 4.3 months. Often enough to close a funding round or reach break-even if changes are implemented decisively.
Runway math is unforgiving. 3 months of delayed action at 50k burn = 150k lost. The earlier cost cuts happen, the more runway extends. Companies that wait until 3 months runway to cut lose far more than those who act at 6 months. Founders consistently underestimate how long fundraising takes (typically 4-6 months for seed, 6-9 months for Series A).
Run it with sensible defaults
Using current cash of 500,000, current monthly burn of 50,000, cost reduction of 20%, revenue increase monthly of 5,000, the calculation works out to 14.3 months. The defaults are meant as a starting point, not a recommendation.
The levers in this calculation
The inputs — Current Cash, Current Monthly Burn, Cost Reduction %, and Revenue Increase Monthly — do not pull with equal force. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
How the math works
New burn = current × (1 - cut %) - revenue increase. Extended runway = cash ÷ new burn.
Using this as a check-in
Re-run this every three months. A single reading tells you where you stand; four readings tell you whether things are improving. The trend matters more than any individual snapshot.
What this doesn't capture
The score is a composite of the inputs you provide. Life context — job security, family obligations, health, housing — doesn't appear in the math but shapes the real picture. Use the number as a prompt, not a verdict.
££500,000 ÷ (££50,000 × (1 - 20%) - ££5,000) = 14.3 months.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator models startup runway by computing the number of months until cash reserves deplete. It takes current cash on hand and divides it by the adjusted monthly burn rate. The adjusted burn is calculated by reducing the current monthly burn by the cost reduction percentage, then subtracting the monthly revenue increase. The model assumes a constant monthly burn rate and constant monthly revenue contribution throughout the runway period. It does not account for variable costs, seasonal fluctuations, one-time expenses, working capital changes, or the timing of incoming revenue. Results represent months of operation under the stated conditions; actual runway may differ based on changes in business conditions, spending patterns, or revenue realization.
References
Frequently Asked Questions
When to cut?
What to cut first?
Revenue increase realistic?
Bridge round vs cuts?
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