How do I track burn rate and runway for my startup?
Burn rate is how much cash your startup spends each month. Runway is how many months you can operate before the money runs out. Both metrics require accurate financial records to calculate correctly.
Gross burn rate is your total monthly cash outflow. Add up everything you spend in a month including payroll, software, rent, contractors, and operating expenses. Net burn rate accounts for revenue, so if you spend $50,000 but bring in $20,000, your net burn is $30,000. Early-stage startups with minimal revenue often focus on gross burn since that’s what drains the bank account.
To calculate runway, divide your current cash balance by your monthly burn rate. If you have $300,000 in the bank and burn $30,000 per month, your runway is 10 months. This assumes burn rate stays constant, which it rarely does, so treat runway as an estimate rather than a guarantee.
Tracking these numbers requires closing your books monthly. You need reconciled bank accounts, categorized expenses, and accurate cash balances. If your books are two months behind or transactions are miscategorized, your burn rate calculation will be wrong. Tech startups often move fast and let bookkeeping slide, but that creates blind spots exactly when visibility matters most.
Pull the same report each month to track trends. Your accounting software can generate a cash flow statement or profit and loss that shows total expenses. Watch for spikes that indicate one-time costs versus baseline operating expenses. A month with a big equipment purchase or annual software renewal will skew your average if you don’t account for it.
Many founders check their bank balance and guess at burn rate. That works until you forget about the quarterly tax payment hitting next week or the annual insurance premium due in two months. Proper tracking means forecasting known upcoming expenses, not just looking backward at what you already spent.
Investors will ask about burn rate and runway during due diligence. Having clean monthly financials and a clear answer builds credibility. Scrambling to reconstruct numbers from bank statements signals that financial management isn’t a priority.
The mechanics aren’t complicated. Run a small business bookkeeping service that closes your books by the 15th of each month. Pull your cash balance and total expenses. Calculate burn and runway. Review trends over time. The discipline of doing this consistently matters more than sophisticated analysis.
If your burn rate is climbing or runway is shrinking faster than expected, you’ll catch it early when you have options. Waiting until the bank account looks scary means you’re reacting instead of planning.
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