How to Calculate Burn Rate in One Line
Burn rate is how much cash your startup loses each month, calculated as the cash you had at the start of the month minus the cash you have at the end. If you began March with $500,000 and ended with $450,000, your burn rate is $50,000 per month. That is the whole idea.
Burn rate is the single most important operating number a pre-profit founder tracks, because it determines your runway, which determines when you must raise again. Every investor you pitch will ask for it, and a founder who cannot answer instantly looks like they are not watching the tank.
Knowing your burn tells you the deadline. Knowing your burn plus a live investor pipeline tells you whether you will beat it. Round Funded gives you the pipeline: 10,000+ active investors filtered by stage, so you start raising before the runway runs out.
Gross Burn vs Net Burn: The Distinction That Matters
Gross burn is your total monthly cash spend; net burn is that spend minus your monthly revenue. The difference matters because a company with real revenue burns far less net cash than its gross spending suggests, and investors care about the net number.
Here is how they split:
| Metric | Formula | What it tells you |
|---|---|---|
| Gross burn | Total monthly operating expenses | Your full cost to operate |
| Net burn | Gross burn minus monthly revenue | How fast you actually lose cash |
A worked example: you spend $80,000 a month on salaries, tools, and rent (gross burn), and you bring in $30,000 in revenue. Your net burn is $50,000. If you have $500,000 in the bank, your runway is based on the $50,000 net figure, not the $80,000 gross figure. Revenue directly buys you months of survival.
Track both. Gross burn shows your cost discipline; net burn shows your true cash clock.
Turning Burn Rate Into Runway
Runway is your cash balance divided by your monthly net burn, and it is the number that actually sets your fundraising deadline. Burn rate on its own is trivia. Burn rate expressed as runway is a countdown.
The formula:
Runway (in months) = Current cash / Monthly net burn
If you have $600,000 in the bank and burn $50,000 net per month, you have 12 months of runway. Simple. Now the important part: you do not wait until month 12 to start raising. A round takes three to six months to close, so you begin the raise when you have roughly six months of runway left.
That means your real fundraising deadline is month 6, not month 12. Founders who miss this raise from a position of desperation, which weakens every term they negotiate. Start early, with a full pipeline. To learn how to read runway more precisely, see our guide to cash runway.
The Burn Numbers Investors Expect in 2026
Investors judge burn against progress, not against an absolute dollar figure. A high burn with fast growth is fine; a high burn with flat metrics is a red flag. There is no single "good" burn rate, only burn relative to what it buys you.
What investors actually look for:
- A burn multiple (net burn divided by net new ARR) under 1.5x at growth stage, and ideally under 1x. Burn less than a dollar to add a dollar of recurring revenue.
- At least 12 months of runway after a raise, ideally 18 to 24, so you have time to hit the next milestone.
- Burn that scales with results. Rising burn is fine if revenue is rising faster.
- A founder who knows the number cold. The instant, confident answer is itself a signal.
The worst position is high burn, low growth, and a short runway. It forces a raise at a weak moment. Watch the burn multiple, not just the dollar amount.
Where Round Funded Fits: Beat the Runway Deadline
Round Funded exists because burn rate creates a deadline, and the only way to beat a deadline is to start early with a full pipeline. Most founders discover their runway is short, then scramble to find investors from scratch. That scramble is the expensive part.
Round Funded removes it:
| The runway problem | How Round Funded helps |
|---|---|
| A hard deadline set by your burn | 10,000+ active investors ready to build a pipeline now |
| Wasting weeks finding investor names | Filter by stage, sector, geo, and last-investment date |
| Slow, manual outreach | Send personalized emails and track opens and replies |
| Raising from a position of weakness | Start early, run a full process, negotiate from strength |
The math is simple: if a round takes three to six months and your runway is twelve, you start the moment you have six months left. Round Funded lets you start that day, not weeks later after building a list by hand.
Browse 10,000+ active investors on Round Funded ->
Step by Step: Calculate and Act on Your Burn
Here is the practical sequence.
- Pull your cash balance at the start and end of last month from your bank account. The difference is your gross monthly cash change.
- Separate revenue from spend to get gross burn (spend) and net burn (spend minus revenue).
- Divide cash by net burn to get your runway in months.
- Subtract your raise time. A round takes three to six months, so your real deadline is that many months before zero.
- Start your pipeline at the deadline. Use Round Funded to build a list of active, stage-matched investors and begin outreach the day you hit six months of runway.
- Recalculate monthly. Burn changes as you hire and grow. Track it every month so the deadline never surprises you.
Frequently Asked Questions
What is a good burn rate for a startup?
There is no universal figure. A good burn rate is one that buys proportional progress. Investors judge it with the burn multiple: net burn divided by net new ARR. Under 1x is excellent, under 1.5x is healthy. High burn with flat metrics is the real problem, not the dollar amount itself.
How much runway should I have before raising?
Start raising when you have roughly six months of runway left, because a round typically takes three to six months to close. Waiting longer forces you to raise from weakness. Build your investor pipeline early via Round Funded so you can start the process the day you hit that mark.
What is the difference between gross burn and net burn?
Gross burn is your total monthly cash spend. Net burn is that spend minus your monthly revenue. Net burn is the number that sets your runway, because revenue offsets your spending. A company with strong revenue has a much lower net burn than its gross spending suggests.
How do I calculate runway from burn rate?
Divide your current cash balance by your monthly net burn. If you have $600,000 and burn $50,000 net per month, you have 12 months of runway. Then subtract your fundraising timeline (three to six months) to find your real deadline to start raising.
Should I lower my burn or raise more money?
It depends on your growth. If burn is buying strong growth, raising more to keep momentum is often right. If burn is high with flat metrics, cut first, because investors will not fund inefficient growth. Either way, line up investors early on Round Funded so you have the option to raise on your terms.
Does revenue count against my burn rate?
Yes, for net burn. Net burn subtracts monthly revenue from monthly spend, so every dollar of revenue directly extends your runway. This is why net burn, not gross burn, is the number investors and founders use to plan the next raise.
Know the Deadline, Then Beat It
Burn rate is not a number to fear. It is a number to respect. It tells you exactly when you must raise, which means you can plan the raise instead of being ambushed by it. The founders who get crushed are the ones who calculate their runway too late and start their investor search from zero.
Do not be that founder. Calculate your burn, find your deadline, and build your pipeline before you need it.
Start raising from 10,000+ active investors ->
Watch the tank, start early. Find your next investor on Round Funded.
