Burn Rate Calculator
Calculate gross burn, net burn, and startup runway from monthly cash inflows, outflows, and current cash reserves.
Burn Rate Calculator
A burn rate calculator shows how quickly a business is using cash over a month when operating expenses are higher than incoming cash. Founders, finance teams, startup operators, and agency owners use a burn rate calculator to understand how much cash is leaving the business, how long reserves may last, and when they need to cut costs, raise funding, or increase revenue.
The result matters because a business can look busy and still run out of cash. Burn rate turns scattered spending and revenue numbers into a simple monthly pressure check. When you pair it with current cash on hand, it also helps estimate runway.
How to Use the Burn Rate Calculator
- Enter the cash going out each month, such as payroll, rent, software, contractors, loan payments, and marketing spend.
- Enter the cash coming in during the same month, such as recurring revenue, collected invoices, or other operating inflows.
- Add your current cash balance if the calculator also estimates runway.
- Review the net burn rate and, if shown, the number of months of runway remaining.
- Re-run the numbers with hiring changes, lower ad spend, or different revenue assumptions before making operating decisions.
Use the same period for every input. Mixing monthly expenses with quarterly revenue will make the result misleading.
What the Burn Rate Calculator Measures
The burn rate calculator measures how much cash the business loses over a period after cash inflows are offset against cash outflows.
| Input | What it means | Example |
|---|---|---|
| Monthly cash outflows | Total cash paid out during the month | USD 85,000 |
| Monthly cash inflows | Revenue or other operating cash collected | USD 25,000 |
| Cash balance | Cash reserves available today | USD 360,000 |
| Output | Net burn and runway | USD 60,000 burn, 6 months runway |
That makes the tool useful for startup planning, budget reviews, lender discussions, and board updates.
Burn Rate Formula
Most teams use two related views:
Gross burn rate = Total monthly cash outflows
Net burn rate = Monthly cash outflows - Monthly cash inflows
Cash runway in months = Current cash balance / Net burn rate
Gross burn tells you how expensive the business is to operate. Net burn tells you how much cash the business actually loses after revenue is counted.
Example Burn Rate Calculation
Suppose a startup spends USD 85,000 in one month and collects USD 25,000 from customers during that same month. It has USD 360,000 in the bank.
The calculation is:
Gross burn = 85,000
Net burn = 85,000 - 25,000 = USD 60,000
Runway = 360,000 / 60,000 = 6 months
That means the company is currently losing about USD 60,000 per month and has roughly 6 months of runway if nothing changes.
Gross Burn vs Net Burn
Gross burn
Gross burn focuses only on cash going out. It is useful when you want to understand the size of the cost base before revenue enters the discussion.
Net burn
Net burn is the more practical decision metric because it shows how much cash the business must cover from reserves or new funding after revenue is collected.
Why both matter
A company can reduce net burn by increasing revenue, but gross burn still matters because a large fixed cost base raises operating risk if sales slow down.
What Changes Burn Rate Most
- Headcount growth usually has the biggest impact because salaries, benefits, and contractors are recurring costs.
- Marketing spend can move burn rate quickly, especially when campaigns are scaled before payback is proven.
- Revenue collection timing matters. A profitable month on paper can still create cash stress if invoices are paid late.
- Office, software, and financing costs often look small individually but add up into meaningful fixed overhead.
Common Burn Rate Mistakes
- Mixing booked revenue with collected cash.
- Treating one-time revenue as if it will repeat every month.
- Ignoring taxes, annual renewals, or debt payments that hit cash later.
- Looking only at burn rate without checking current cash balance.
- Assuming runway stays constant even when hiring plans or ad spend are about to change.
If you also want to see how long current reserves may last, compare this page with a Cash Runway Calculator, Cash Flow Calculator, Startup Cost Calculator, or Working Capital Calculator.
FAQ
What is a burn rate calculator?
It is a tool that estimates how much cash a business is using over a period, usually a month, and may also show how many months of runway remain.
What is the difference between gross burn and net burn?
Gross burn is total cash outflows. Net burn subtracts cash inflows from cash outflows, so it shows the actual monthly cash loss.
Is burn rate the same as profit?
No. Burn rate is a cash metric, while profit is an accounting metric. A business can report revenue but still have a cash problem if collections are slow or expenses hit earlier.
What is a healthy burn rate?
There is no universal number. A healthy burn rate is one the business can fund safely relative to cash reserves, growth targets, and the time needed to reach the next milestone.
Why should I calculate runway with burn rate?
Because burn rate alone tells you the speed of cash loss, while runway shows how long current reserves may support that pace before more funding or cost changes are needed.