Startup Burn Rate: What It Is, How to Calculate It, and What It Means for Your Business
Burn rate is the single most important financial metric for any startup or pre-profit business. Here's how to calculate it, what it tells you, and how to improve it.
Burn rate is the speed at which your business is spending its cash reserves. For pre-revenue and early-revenue businesses, it's the most important financial metric you track — because it tells you how long you have before you run out of money.
Understanding burn rate doesn't require an accounting degree. Here's what it is, how to calculate it, and what to do about it.
What Is Burn Rate?
Burn rate is how much cash your business consumes each month beyond what it earns.
There are two types:
Gross burn rate: Total cash spent per month, regardless of revenue.
Net burn rate: Cash spent minus cash received. This is the number that actually matters for runway.
If you're spending $20,000/month and earning $8,000/month in revenue, your net burn rate is $12,000/month.
How to Calculate Burn Rate
Gross Burn Rate
Gross burn rate = Total monthly expenses
Add up every expense for the month: salaries, rent, software, marketing, legal, etc.
Net Burn Rate
Net burn rate = Total monthly expenses − Monthly revenue
A business with $20,000 in expenses and $8,000 in revenue has a net burn rate of $12,000/month.
If revenue exceeds expenses, you're not burning — you're profitable. At that point burn rate becomes less relevant.
Runway
Runway is how many months you can operate before running out of cash at your current burn rate.
Runway (months) = Cash on hand ÷ Monthly net burn rate
Example:
- Cash on hand: $120,000
- Net burn rate: $15,000/month
- Runway: 8 months
Most advisors recommend maintaining at least 12 months of runway. Below 6 months, you should be actively fundraising or cutting costs.
Why Burn Rate Matters for Canadian Startups
For incorporated Canadian businesses, burn rate connects directly to your financial strategy:
- Investor conversations: Any serious investor will ask for your burn rate and runway before anything else
- Salary decisions: The single largest lever on burn rate is usually founder salary — understanding burn rate helps you make rational decisions about compensation
- Hiring timing: Know exactly how much each new hire extends or compresses your runway
- Tax planning: A corporation with a high burn rate and funding may structure compensation differently than a profitable one
How to Reduce Burn Rate
Immediate levers
- Defer non-essential software: Audit your subscriptions quarterly — most businesses have 3–5 they've forgotten about
- Delay hiring: Can the work be done by contractors or part-time before you commit to full-time salaries?
- Negotiate rent: Especially in a hybrid/remote environment, office space is often the second-largest expense
Revenue-side improvements
Increasing revenue reduces net burn rate even if gross burn stays the same. A focus on revenue growth often has a larger impact than cost-cutting.
Founder salary calibration
If you're paying yourself market rate and it's compressing your runway, consider a temporary reduction in exchange for more equity or a future catch-up mechanism.
Burn Rate and Bookkeeping
You can't calculate burn rate without clean books. Specifically:
- Monthly P&L showing all expenses categorized
- Cash flow statement showing actual cash movement (not just accrual P&L)
- Current bank balance
If your books are 2 months behind, your burn rate calculation is 2 months stale — and decisions made on that data are wrong.
This is one of the clearest examples of why real-time bookkeeping matters. See our guide on when to hire a bookkeeper if your books aren't current.
Monthly Review Cadence
For any startup or early-stage business, review these monthly:
| Metric | What it tells you | |--------|------------------| | Net burn rate | How fast you're consuming cash | | Runway | How long you have at current rate | | Revenue vs. plan | Are you tracking toward breakeven? | | MoM expense change | Is any category growing unexpectedly? | | Gross margin | Are you making money on what you sell? |
A 30-minute monthly financial review prevents the slow-motion surprise of discovering your runway is 4 months when you thought it was 10.
The Bottom Line
Burn rate is not a complex concept — but it's the single most important number for any business that's not yet consistently profitable. Know it. Track it monthly. Make decisions based on it.
For the bookkeeping foundation that makes this possible, start with our complete bookkeeping guide for Canadian small businesses.
Bookkeeper's real-time P&L and cash flow reports give you your burn rate automatically every month. Start free.
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