Strategy
See how many extra months of runway an efficiency gain buys you.
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- Claude, via MCP
How much runway does cutting burn add?
Runway = cash ÷ (gross burn − revenue). Cutting gross burn shrinks net burn by more in percentage terms, so runway grows faster than the cut. With ₹1.5 crore cash, ₹18 lakh monthly burn and ₹6 lakh revenue, runway is 12.5 months; a 20% burn cut stretches it to 17.9 months.
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.
Runway before and after a burn reduction
Net burn = Gross monthly burn − Monthly revenue Runway (months) = Cash ÷ Net burn New gross burn = Gross burn × (1 − Reduction %) New runway = Cash ÷ (New gross burn − Monthly revenue) Months gained = New runway − Current runway
- Gross monthly burn
- All cash going out each month: salaries, tools, rent, marketing.
- Monthly revenue
- Cash coming in from customers each month.
- Reduction %
- Planned cut to gross burn from efficiency measures.
Revenue is held flat on purpose, to isolate the cost lever. If cuts slow revenue growth (for example, cutting marketing that generates pipeline), the real gain is smaller. Use cash, not accounting figures: annual prepayments from customers and annual tool bills distort monthly numbers.
Worked example: a 20% cut at a SaaS startup
A startup has ₹1.5 crore in the bank, spends ₹18 lakh a month and brings in ₹6 lakh a month from customers. It plans to cut gross burn by 20% by consolidating tools and pausing two open roles.
- Net burn now = ₹18 lakh − ₹6 lakh = ₹12 lakh.
- Runway now = ₹1.5 crore ÷ ₹12 lakh = 12.5 months.
- New gross burn = ₹18 lakh × 80% = ₹14.4 lakh.
- New net burn = ₹14.4 lakh − ₹6 lakh = ₹8.4 lakh.
- New runway = ₹1.5 crore ÷ ₹8.4 lakh = 17.9 months, a gain of 5.4 months.
A 20% cut in gross burn reduces net burn by 30%, which buys 43% more runway. The extra five months can be the difference between raising from a position of strength and raising in a hurry. Check how efficiently the remaining spend grows revenue with the burn rate optimisation forecaster, and find tool overlap with the tech stack duplication inspector.
Burn multiple, a common efficiency check
| Burn multiple (net burn ÷ net new ARR) | Reading |
|---|---|
| 2× | Reasonable for an early-stage startup |
| 3× or more | A sign that product-market fit may be weaker than it looks |
| 5× | Terrible |
How much runway should a startup have?
Enough to reach the next milestone that changes your options, plus time to raise if needed. A practical way to set it:
- Work out the months to the next milestone (profitability, a revenue level, a product launch).
- Add the months a fundraise usually takes.
- Add a buffer for slippage.
If runway is shorter than that total, cut burn or change the plan now, while cuts can be chosen carefully rather than forced.
Runway planning in India vs the US
Indian startups often have lower salary costs but can face longer fundraising cycles in tight markets, so plan the raise period generously. GST refunds, TDS deducted by customers and delays in enterprise payments affect cash timing; use cash received, not invoices, in monthly revenue.
US startups usually carry higher salary and benefits costs, so headcount decisions dominate burn. Annual software contracts paid upfront make some months look heavier; spread them across the year when calculating gross burn.
Common runway mistakes
- Using revenue booked rather than cash received.
- Cutting spend that drives revenue and then assuming revenue holds.
- Forgetting one-time payments due, such as annual renewals or taxes.
- Planning runway to zero instead of to the point where you must raise or be profitable.
- Treating all spend as equal instead of cutting the least productive first.
Sources
- The Burn Multiple, David Sacks. Accessed 2026-10-19.
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.
Gross burn is total monthly spending. Net burn is gross burn minus revenue: the cash you actually lose each month.
Not if the spending produces revenue efficiently. Check the burn multiple: cut spending that buys little growth, keep spending that buys a lot.
Numbers looking off?
If the model says one thing and the pipeline says another, that gap is usually where the revenue is. A 30-minute call finds it.
It starts with a 30-minute call. Pick a time below.