Startup burn rate is the amount of cash a company spends each month to keep operating. It’s one of the clearest signals of how fast a business is using the money it has.
A startup burn rate calculator takes three inputs — monthly operating expenses, monthly revenue, and cash available — and produces four outputs: gross monthly burn, monthly revenue, net monthly burn, and estimated runway.
That output answers a question every founder and finance lead needs to know: how long can the business keep running at its current spending level?
Let’s cover what burn rate means, how gross and net burn differ, how runway is estimated, and where the numbers are most useful.
Startup Burn Rate Calculator
Calculate your startup’s monthly burn rate, net burn, and estimated runway.
Step-by-Step Calculation
What Is Startup Burn Rate?
Burn rate is the rate at which a startup uses its cash. It’s usually measured monthly.
If a company spends $80,000 per month on operating expenses and brings in $30,000 in revenue, it’s consuming $50,000 of its cash reserves each month. That $50,000 is the net burn.
Burn rate isn’t a measure of how much a company spends in total. It’s a measure of how much cash leaves the business after accounting for what comes in. That’s why revenue matters in the calculation.
For early-stage companies with no revenue, burn rate equals total monthly expenses. For companies with recurring revenue, burn rate shrinks as revenue grows.
Why Burn Rate Matters for Startups
Burn rate sits at the center of several financial decisions.
Cash management
It shows how quickly the business is using the money it has. Without that number, cash planning is guesswork.
Financial planning
Burn rate feeds directly into how long the business can operate before needing more funding or reaching profitability.
Budget control
Tracking burn monthly makes it easier to spot expense growth before it becomes a problem.
Runway management
Runway is calculated from burn rate. If burn rises, runway shortens even if cash on hand hasn’t changed.
Expense monitoring
Regular burn reviews show which cost categories are growing and which are stable.
Funding planning
Founders use burn rate and runway to decide when to raise, how much to raise, and how much time the raise buys.
A working capital calculator can help show whether current assets cover short-term obligations alongside burn rate analysis.
Gross Burn vs. Net Burn
These two terms get used interchangeably, but they mean different things.
Gross burn is total monthly operating expenses. It ignores revenue entirely.
Net burn is monthly operating expenses minus monthly revenue. It shows the actual cash consumption after incoming money is accounted for.
Gross burn tells you how much it costs to run the business. Net burn tells you how much of your cash reserves are being used each month.
A company with $100,000 in monthly expenses and $40,000 in monthly revenue has a gross burn of $100,000 and a net burn of $60,000.
| Metric | What It Measures | Includes Revenue? |
|---|---|---|
| Gross burn | Total monthly operating expenses | No |
| Net burn | Monthly expenses minus monthly revenue | Yes |
Both are useful. Gross burn shows the cost structure. Net burn shows the cash impact.
What Is Startup Runway?
Runway is how many months a startup can continue operating at its current burn rate before its cash runs out.
Runway = Available Cash ÷ Monthly Net Burn
If a company has $600,000 in the bank and a net burn of $60,000 per month, its runway is 10 months.
Runway is a time measurement, not a dollar amount. It answers the question: how long do we have?
When revenue covers or exceeds expenses, net burn is effectively zero, and the runway calculation changes meaning. A company at that point isn’t consuming cash — it’s sustaining itself or adding to reserves. In that situation, runway is often described as unlimited or not applicable in the burn-based sense.
A DSCR calculator can help if the business carries debt and needs to check whether operating income covers loan obligations.
How to Calculate Startup Burn Rate
The process is straightforward.
- Add up all monthly operating expenses.
- Add up monthly revenue.
- Subtract revenue from expenses to get net burn.
- Divide available cash by net burn to estimate runway.
That’s the whole calculation. The complexity comes from getting the inputs right, not from the math.
Use actual figures from the most recent month or a realistic average across recent months. Estimates based on old data or optimistic projections produce misleading results.
How to Use a Startup Burn Rate Calculator
The calculator takes three inputs and returns four outputs. Here’s how each works.
Monthly Operating Expenses
This is the total cost of running the business each month. Common categories:
- Salaries and payroll costs
- Office or coworking rent
- Software and subscriptions
- Marketing and advertising
- Professional services (legal, accounting)
- Utilities and internet
- Insurance
- Equipment and maintenance
- Other recurring operating costs
Include everything the business pays to operate. Leaving out recurring expenses understates burn and overstates runway.
Monthly Revenue
This is the money the business brings in each month. For net burn, regular or recurring revenue matters most.
One-time revenue spikes can distort the picture. If a business collects a large annual payment in one month, using that month as a baseline makes net burn look artificially low. Use a typical month or a rolling average.
Cash Available
This is the cash the business can access right now. It typically includes bank balances and other liquid funds, but not money that isn’t readily available.
Overestimating available cash is one of the most common burn rate mistakes. Restricted funds, deposits, or money already committed to specific expenses shouldn’t be counted as freely available.
Understanding Your Calculator Results
The calculator produces four outputs.
Gross monthly burn
Total monthly operating expenses. This shows what it costs to run the business, before any revenue.
Monthly revenue
The revenue figure entered. Shown for clarity and comparison.
Net monthly burn
Monthly operating expenses minus monthly revenue. This is the actual cash consumed each month, assuming revenue is less than expenses.
Estimated runway
Available cash divided by net monthly burn. This shows how many months the business can operate at its current burn rate before cash runs out.
Each output answers a different question. Gross burn shows cost structure. Net burn shows cash usage. Runway shows time remaining.
For a broader view of how the business is performing relative to its costs, a SaaS gross margin calculator can help show how much revenue remains after delivery costs.
Burn Rate Example
A simple example with round numbers.
Monthly operating expenses: $80,000
Monthly revenue: $30,000
Cash available: $500,000
Gross monthly burn: $80,000
**Net monthly burn:** $80,000 − $30,000 = $50,000
Estimated runway: $500,000 ÷ $50,000 = 10 months
The business is spending $80,000 per month to operate. Revenue covers $30,000 of that, leaving $50,000 of cash consumed each month. At that rate, the current cash balance supports about 10 months of operation.
This is an illustrative example, not a prediction. Actual runway changes as expenses, revenue, and cash balance change.
Gross Burn and Net Burn: Key Differences
| Gross Burn | Net Burn | |
|---|---|---|
| Definition | Total monthly operating expenses | Monthly expenses minus monthly revenue |
| Revenue included? | No | Yes |
| Main purpose | Show cost structure | Show actual cash consumption |
| Use in runway calculations | Not directly | Used to estimate runway |
Gross burn is the starting point. Net burn is what matters for runway.
How to Reduce Startup Burn Rate
These are general cost-management approaches. None of them guarantee a specific outcome.
- Review recurring subscriptions and cancel unused tools
- Monitor hiring costs and pace new roles carefully
- Review marketing spending and focus on what performs
- Negotiate recurring expenses at renewal
- Prioritize essential expenses over optional ones
- Track monthly cash usage consistently
- Compare vendor costs periodically
- Consolidate software and services where possible
Reducing burn extends runway, but the right balance depends on what the business needs to grow. Cutting too deeply can slow progress.
If acquisition spending is a large part of burn, an LTV to CAC ratio calculator can show whether that spending is producing proportionate revenue.
How Often Should a Startup Calculate Burn Rate?
Monthly is the standard for most startups. It lines up with typical reporting cycles and gives enough data to spot trends.
Rapidly changing businesses may review cash position more frequently — weekly or biweekly — especially when burn is high or runway is short.
The important thing is consistency. Tracking burn on the same schedule each period makes comparisons meaningful. A business overhead expense calculator can help keep the expense side of the calculation current.
Common Startup Burn Rate Mistakes
Watch for these.
- Forgetting recurring expenses — annual or quarterly costs get missed when working from monthly memory
- Ignoring revenue — treating gross burn as net burn overstates cash consumption
- Using outdated expense figures — last quarter’s costs may not reflect this quarter
- Confusing gross burn with net burn — they answer different questions
- Overestimating available cash — counting restricted or committed funds as free cash
- Ignoring one-time expenses — large irregular costs can distort a single month
- Not updating calculations regularly — burn changes as the business changes
A B2B customer retention calculator can help if retention affects how predictable monthly revenue is.
Burn Rate vs. Runway
These two are related but distinct.
Burn rate is a dollar amount per month. It shows how much cash the business uses.
Runway is a number of months. It shows how long the current cash balance will last at the current burn rate.
Burn rate is the speed. Runway is the distance. Changing burn changes runway, but they’re not the same measurement.
A company with a high burn rate and a large cash balance might have a long runway. A company with a low burn rate and a small cash balance might have a short one.
Burn Rate and Startup Financial Planning
Burn rate supports several planning activities.
Cash flow planning
It shows how much cash leaves the business each month, which feeds directly into cash flow forecasts.
Budgeting
Monthly burn tracking keeps the operating budget grounded in actual numbers.
Expense management
Recurring reviews surface expenses that have grown or no longer serve the business.
Revenue planning
Comparing burn to revenue shows how close the business is to covering its own costs.
Fundraising preparation
Investors ask about burn rate and runway. Having accurate numbers ready makes those conversations easier.
Financial forecasting
Burn rate and runway feed into projections for how long current cash lasts and when the next raise may be needed.
A business valuation calculator can help founders put those projections in context when preparing for investor discussions.
Frequently Asked Questions
What is a startup burn rate?
It’s the amount of cash a startup uses each month to operate. It’s typically measured as either gross burn (total expenses) or net burn (expenses minus revenue).
How do you calculate startup burn rate?
Add up monthly operating expenses. Subtract monthly revenue to get net burn. Divide available cash by net burn to estimate runway.
What is the difference between gross burn and net burn?
Gross burn is total monthly operating expenses. Net burn is monthly expenses minus monthly revenue. Net burn shows actual cash consumption.
How is startup runway calculated?
Runway = Available Cash ÷ Monthly Net Burn. The result is the number of months the business can operate at its current burn rate.
What expenses are included in burn rate?
Salaries, office costs, software, marketing, professional services, utilities, insurance, and other recurring operating expenses.
Does revenue reduce net burn?
Yes. Revenue offsets operating expenses in the net burn calculation. When revenue covers or exceeds expenses, net burn is effectively zero.
How often should startups calculate burn rate?
Monthly is standard for most startups. Faster-changing businesses may review cash position weekly or biweekly.
What does a high burn rate mean for cash usage?
A high burn rate means the business is consuming cash quickly. It shortens runway unless revenue grows or expenses decrease.
Can a startup have zero net burn?
Yes. When monthly revenue equals or exceeds monthly operating expenses, net burn is zero or negative. The business isn’t consuming cash at that point.
How does burn rate affect startup runway?
Higher burn shortens runway. Lower burn extends it. Runway is calculated directly from net burn and available cash.
Wrapping It Up
A startup burn rate calculator turns three inputs — monthly expenses, monthly revenue, and available cash — into a clear picture of cash usage and time remaining.
Gross burn shows what it costs to operate. Net burn shows what’s actually leaving the bank. Runway shows how long the business can keep going at that rate.
Review it monthly. Update the inputs as costs and revenue change. A number from three months ago isn’t a plan for the next three.