Burn rate is the metric that provides the founder with the information on how much time he or she has, in other words, how fast the cash on hand will be spent due to outflow exceeding inflow.
Therefore, it is the critical metric for any pre-profitability company, as it transforms abstract figures of money into months and years of runway. This knowledge, in turn, allows such founders to make better decisions than those who have to rely on estimates and guesswork when the board asks how much time is left before the company goes bankrupt.
Counter-intuitively, while many founders can describe their spending in vivid detail, few are actually aware of their net-burn position, let alone can explain it. Gross spending is simple to calculate and is usually visible on the bank account withdrawal statements.
Meanwhile, to get to net-burn, one has to estimate the gross spendings against the monthly revenues and take the difference between the two figures. And this difference, despite coming from simple arithmetic, is often misunderstood, particularly since it makes many industries look better than they actually are.
Gross Burn Rate vs Net Burn Rate
| Type | Definition | Formula |
|---|---|---|
| Gross Burn Rate | Total cash spent per month, regardless of revenue | Gross Burn = Total Monthly Operating Expenses |
| Net Burn Rate | Cash lost per month after accounting for revenue | Net Burn = Monthly Cash Outflows − Monthly Cash Inflows |
Net burn rate is the more important number, it shows how fast cash reserves are actually depleting. Gross burn rate shows total spending, which matters for cost control but does not tell you about runway without knowing revenue.
The mistake that catches founders off-guard almost every time is tracking gross burn and calling it done, without ever subtracting revenue to get net burn. By the time they calculate runway properly, they've often already lost a month or two they could have used to fix it.
Abhinav Gupta, CPA, CA, MBA · LinkedInBurn Rate Calculation: Worked Example
| Monthly Item | Amount |
|---|---|
| Staff salaries and contractor fees | $85,000 |
| Office rent and utilities | $12,000 |
| Cloud infrastructure / software | $8,000 |
| Marketing and sales | $20,000 |
| Other operating costs | $5,000 |
| GROSS BURN RATE | $130,000/month |
| Monthly Revenue (ARR / 12) | $45,000 |
| NET BURN RATE | $130,000 − $45,000 = $85,000/month |
How to Calculate Runway
Runway = Cash Reserves / Net Burn Rate
Example: $510,000 in cash / $85,000 net burn = 6 months of runway
This means the business will run out of cash in 6 months at the current burn rate and revenue level, unless it raises capital, increases revenue, or reduces costs.
Burn Rate Benchmarks and Investor Expectations
| Runway | Investor Signal | Recommended Action |
|---|---|---|
| 18+ months | Comfortable, ample time to hit milestones and fundraise without pressure | Continue executing; begin next round conversations at 12 months remaining |
| 12 to 18 months | Normal, healthy buffer | Start fundraising process at 12 months if you plan to raise again |
| 6 to 12 months | Watch zone, fundraising should already be in progress | Prioritise revenue acceleration and cost review immediately |
| Under 6 months | Critical, urgent action required | Immediate cost cuts, bridge funding, or revenue push; pivot if necessary |
How to Reduce Burn Rate
Reduce Gross Burn
- Headcount is typically 60 to 80% of a startup's burn, defer non-essential hires; consider contractors for non-core functions
- Audit recurring software and infrastructure costs, scale cloud usage to actual demand; cancel unused tools
- Renegotiate office lease, consider remote-first to eliminate rent entirely, or sublet unused space
Increase Revenue to Reduce Net Burn
- Accelerate enterprise deals one large contract can change the net burn picture significantly
- Introduce annual prepayment option offer a discount for annual upfront payment to receive cash immediately
- Cut low-ROI marketing spend and redirect to highest-converting channels
Client quote:
We knew our cash balance, but we hadn't calculated our net burn properly, so we didn't realize how quickly we were using our reserves. Profitjets mapped our monthly inflows and outflows and found that we had only five months of runway at our existing burn rate. We paused planned hiring, removed several unnecessary subscriptions, and tightened discretionary spending to give us more time.
Runway Is a Planning Number, Not a Countdown
Runway calculated by dividing cash by last month's burn assumes the future looks exactly like the past month, which it never does.
The version worth acting on is built from the forecast rather than from a single month: expected receipts and payments by month, including the things that fall outside a typical month, tax payments, annual renewals, a hire already agreed, a large purchase planned.
- Use an average over several months rather than the most recent one, which may be atypical
- Model the plan rather than the status quo, since costs you have already committed to will arrive
- Include the runway consumed by raising money, because a process takes months during which the burn continues
- Know the point at which you would need to act, not just the point at which cash runs out
Where Burn Hides
Monthly burn calculated from the bank balance misses costs that arrive irregularly, which is why the figure often looks fine until a quarter where everything lands at once.
The usual candidates are annual software renewals, insurance, tax payments, professional fees around a year end, bonuses, and equipment purchases. None of these appear in a typical month and all of them are real.
The fix is to spread them across the year in the forecast rather than showing them in the month they are paid. That gives a burn figure that reflects the true monthly cost of running the business, and it removes the quarterly surprises that make a cash position look unstable when it is merely lumpy.
Cutting Burn Without Cutting Growth
When runway shortens the instinct is across-the-board reduction, which cuts the things that produce revenue alongside the things that do not.
Sort spending by what it does rather than by size. Costs that directly generate revenue, costs that keep the business running, and costs that are optional or aspirational. The third group goes first and usually amounts to more than expected once subscriptions, tools and discretionary projects are listed honestly.
There are also levers that improve cash without reducing spend at all: collecting faster, negotiating longer supplier terms, moving an annual prepayment to monthly, or delaying a purchase by a quarter. Those buy time without damaging capacity, and they are worth exhausting before cutting anything that generates revenue.
Reporting Burn to a Board or an Investor
Burn and runway are the two figures an investor will ask about first, and the way they are presented affects how the conversation goes.
- Give gross and net separately, since one shows the cost base and the other the position after revenue
- State the period the average covers, and flag anything unusual in it
- Show runway on the current plan and on a reduced plan, because the second is the question that follows the first
- Include the months a raise would consume, since runway that ends during a process is not really runway
- Show the trend rather than a single month, because direction is what is being assessed
The presentation that builds confidence is the one that has already asked the obvious follow-up question. Arriving with the reduced plan already modelled says more than the headline number does.
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FAQs
What's a good burn rate for a startup?
There's no universal good number as it depends entirely on stage, funding, and growth rate. What matters is the relationship between burn and runway: most investors want to see 18+ months at all times, with clear milestones hit before that runway expires. A high burn rate can be entirely justified if it's buying faster growth and unit economics are moving in the right direction.
How often should burn rate actually be calculated?
Monthly at minimum. Many well-run startups also track a rolling 13-week cash flow alongside the monthly burn number, the 13-week view catches short-term cash gaps that a monthly average can smooth over and hide. Recalculate runway immediately after any significant change in revenue or costs, not just on the regular monthly cadence.
Should burn rate include one-time expenses?
Generally no, not in the recurring number you use for runway planning: a one-time legal cost or equipment purchase distorts the trend and makes next month look artificially better by comparison. Track one-time costs separately, and factor them into cash reserves directly rather than folding them into the burn rate itself.
Is a rising burn rate always bad?
Not necessarily. a burn rate that's rising because of new hires directly tied to revenue growth, or because of a deliberate push before a raise, can be a sign of intentional investment rather than a problem. The distinction is whether burn is rising with a plan behind it and a runway calculation that still works, or rising because costs are drifting unnoticed.
What is the difference between gross burn and net burn?
Gross burn shows how much cash the business spends each month before considering revenue. Net burn accounts for the cash coming in, so it shows how quickly the company's cash reserves are actually declining. Track both: gross burn helps you understand your cost base, while net burn is more useful for calculating runway.
Written by
Abhinav Gupta, CPA, CA, MBA
Abhinav works with business owners across the US on industry-specific bookkeeping, from dental practices and restaurants to construction and e-commerce. He writes about what each trade's books actually need. Connect on LinkedIn
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