Burn Rate Calculator

Use this calculator to estimate your monthly burn rate based on total cash spent over a period. Essential for startups, early-stage businesses, and any company that needs to monitor cash consumption, plan fundraising, and manage runway.

What this calculator does

The burn rate calculator helps you measure how much cash your business is spending on average each month.

It uses:

• total cash spent over a period
• number of months in that period

This gives you your monthly burn rate - the single most important number for understanding how long your current cash balance will last.

How to use the burn rate calculator

1. Enter your total cash spent - the total amount of cash your business has used during the period, including all operating expenses, payroll, rent, software, and any other outflows
2. Enter the number of months - the length of the period you are measuring
3. The calculator instantly shows your average monthly burn rate

Use actual bank outflows rather than accounting expenses for the most accurate burn rate - burn rate is a cash measure, not an accrual measure.

Burn Rate Formula

Burn Rate = Cash Spent / Months

Where:

• Cash Spent = total cash outflow during the period
• Months = number of months in the period
• Burn Rate = average cash spent per month

Example calculation

If:

• Cash spent = 60,000
• Months = 3

Then:

• Burn rate = 60,000 / 3
• Burn rate = 20,000 per month

The business is spending an average of 20,000 in cash every month. At that rate, a cash balance of 200,000 would last approximately 10 months.

What is burn rate?

Burn rate is the rate at which a business spends its cash over time, typically expressed as a monthly figure. It is most commonly used by startups and early-stage businesses to measure how quickly they are consuming capital before reaching profitability or raising additional funding.

There are two versions of burn rate:

• Gross burn rate - total monthly cash outflow, regardless of revenue
• Net burn rate - monthly cash outflow minus monthly revenue - the true rate at which cash is being consumed after accounting for income

This calculator measures gross burn rate. If your business has revenue, subtract monthly revenue from gross burn rate to get your net burn rate.

What is a good burn rate for a startup?

There is no universal benchmark - burn rate must be evaluated in the context of available cash, growth stage, and revenue trajectory:

• Pre-revenue startups - burn rate is entirely a function of operating costs and should be kept as lean as possible until product-market fit is established
• Growth-stage startups - higher burn is acceptable if it is generating proportional revenue growth and the runway to profitability is clear
• Funded businesses - investors typically expect burn rate to be calibrated to the funding runway, with 18 to 24 months of runway considered a healthy buffer

The most useful question is not whether burn rate is high or low in absolute terms, but whether it is sustainable given your current cash balance and revenue trajectory.

Why burn rate matters for startups and growing businesses

Tracking burn rate helps you:

• understand exactly how fast your cash balance is decreasing each month
• calculate how long your current cash will last before you need additional funding or reach profitability
• plan fundraising timing - most investors advise starting a raise when you have 6 to 9 months of runway remaining
• identify cost areas where spending can be reduced to extend runway
• report accurately to investors and board members on financial health

Gross burn rate vs net burn rate

Understanding both figures gives a complete picture of cash consumption.

• Gross burn rate = total monthly cash outflow - shows the full cost of running the business
• Net burn rate = monthly cash outflow minus monthly revenue - shows the true rate at which the cash balance is declining

For pre-revenue businesses, gross and net burn rate are the same. For businesses with revenue, net burn rate is the more meaningful figure for runway planning. Use the Cash Flow Calculator to model both inflows and outflows together.

How to reduce burn rate

Practical approaches for extending runway by reducing cash consumption:

• Audit recurring software and subscriptions - unused or underused tools are a common source of unnecessary burn
• Defer non-essential hiring - payroll is typically the largest component of burn for early-stage businesses
• Negotiate payment terms - extending supplier payment terms reduces short-term cash outflow
• Cut or pause underperforming marketing spend - reduce paid acquisition spend that is not generating proportional returns
• Move to annual billing for key services - often cheaper than monthly and reduces cash variability

When to use this calculator

Use this calculator when you want to:

• calculate your current monthly burn rate for investor or board reporting
• estimate how long your cash balance will last at the current rate of spending
• model the impact of cost reductions on monthly burn and runway
• prepare for a fundraising conversation with data on cash consumption
• compare burn rate across different periods to identify spending trends

Common mistakes when calculating burn rate

Common mistakes include:

• using accounting expenses rather than actual cash outflows - burn rate is a cash metric, not an accrual metric
• including one-off large payments without noting they are non-recurring, which can distort the monthly average
• confusing gross and net burn rate - using gross burn for runway calculations overstates how quickly cash is being consumed if the business has meaningful revenue
• comparing burn rate across periods of very different length without adjusting for seasonality or one-time events

Burn rate vs cash runway

These two metrics work together to give a complete picture of cash position.

• Burn rate shows how much cash is being spent each month
• Cash runway shows how many months of cash remain at the current burn rate

Burn rate is the input - cash runway is the output. Use the Cash Runway Calculator to calculate how long your current cash balance will last based on your burn rate.

Burn rate vs cash flow

These are related but measure different things.

• Burn rate focuses specifically on cash outflow and is used to assess consumption rate and runway
• Cash flow measures the net movement of cash - both inflows and outflows - and is used to assess overall liquidity

Use the Cash Flow Calculator for a complete view of cash movement including revenue, and burn rate when you want to focus specifically on the rate of cash consumption.

Related calculations

Once you know your burn rate, you may also want to:

• Use the Cash Runway Calculator to calculate how long your cash balance will last
• Use the Cash Flow Calculator to model total cash movement including revenue
• Use the Working Capital Calculator to assess short-term liquidity position
• Use the Revenue Forecast Calculator to model when revenue might offset burn rate

Useful resources

• Stripe - payment infrastructure and financial reporting for startups and subscription businesses
• QuickBooks - accounting software for tracking cash outflows and monitoring burn rate over time
• Xero - cloud accounting platform with cash flow reporting and expense tracking for early-stage businesses
• Brex - business banking and spend management platform designed for startups and growth-stage companies

FAQs

What is burn rate?

Burn rate is the average amount of cash a business spends each month. It is most commonly used by startups to measure how quickly they are consuming capital before reaching profitability or raising additional funding.

How do you calculate burn rate?

Burn Rate = Cash Spent / Months. Divide total cash outflow over a period by the number of months to get the average monthly burn rate.

What is the difference between gross and net burn rate?

Gross burn rate is total monthly cash outflow. Net burn rate subtracts monthly revenue from gross burn - it shows the true rate at which the cash balance is declining after accounting for income.

What is a good burn rate for a startup?

It depends on available cash, revenue stage, and growth plans. The key metric is runway - most investors recommend maintaining at least 18 months of runway at all times and beginning fundraising conversations when 6 to 9 months remain.

How does burn rate relate to runway?

Cash runway = Cash Balance / Monthly Burn Rate. A business with 300,000 in the bank and a 25,000 monthly burn rate has 12 months of runway.

Is a lower burn rate always better?

Not necessarily. A low burn rate with slow growth may be less attractive to investors than a higher burn rate generating strong revenue growth. What matters is the efficiency of spend - whether the cash being consumed is generating proportional value.

How often should I calculate burn rate?

Monthly is standard for most startups and growth-stage businesses. Weekly tracking is useful during periods of rapid change or when runway is short.

When should a startup start worrying about burn rate?

When runway drops below 12 months, burn rate becomes critical. Most experienced founders recommend starting a fundraising process when you have 9 months of runway remaining - raising capital takes longer than most first-time founders expect.

Interpreting your result

Your burn rate result should always be interpreted in context:

• compare it against your historical baseline
• review it alongside the main commercial or operational drivers behind the metric
• compare it across products, channels, periods, or segments where relevant
• avoid interpreting the result in isolation without checking the underlying input values

A single period can be noisy, so trend direction over several periods is usually more useful than one standalone result.

Data quality checklist

Before acting on this result, verify:

• the inputs use the same time period and reporting basis
• one-off anomalies are identified separately from steady-state performance
• discounts, refunds, taxes, or fees are handled consistently where relevant
• the underlying values are complete enough to support a meaningful conclusion

Small input inconsistencies can materially change the result.

How to improve this metric

Practical ways to improve this metric depend on the underlying business model, but often include:

• identify the main driver behind the result before making changes
• test one variable at a time so the impact is easier to measure
• compare performance by segment rather than only at an overall level
• review the metric regularly so changes can be caught early

Improvement is most reliable when measurement definitions remain stable over time.

Benchmarks and target setting

A good target depends on your industry, business model, and stage of growth.

When setting targets:

• compare against your own historical trend before relying on outside benchmarks
• define both minimum acceptable and aspirational target ranges
• review targets whenever pricing, cost, demand, or channel mix changes materially
• pair benchmark review with the underlying commercial context, not just the final number

Your own historical performance is usually the most practical benchmark.

Reporting cadence and decision workflow

For most teams, a simple cadence works best:

• Weekly: monitor the metric when trading conditions or campaign activity change quickly
• Monthly: compare the result against target and prior periods
• Quarterly: reassess assumptions, targets, and the main drivers behind the metric

A practical workflow is to calculate the metric, identify the primary driver of change, test one improvement, and then review the next comparable period before scaling.

Common analysis scenarios

You can use this metric in several practical scenarios:

• monthly performance reviews
• pricing, margin, or cost analysis
• planning and forecasting discussions
• investor, lender, or management reporting

In each scenario, pair the result with the underlying business context so decisions are not made on one number alone.

FAQ extensions

Should I compare this metric across channels?

Yes, but only when definitions and attribution rules are consistent.

How many periods should I review before making changes?

At least 3 comparable periods is a good baseline unless there is a clear data issue or one-off event.

What should I do if this metric improves but profit declines?

Check whether costs, discounts, conversion quality, or downstream profitability changed at the same time.