How startup costs, runway, and break-even are calculated
Startup costs fall into two types: one-time setup costs (equipment, registration, deposits) paid before or at launch, and monthly operating costs (rent, salaries, subscriptions) that recur every month. Together they determine how much funding you need and how long it will last.
Total startup investment = one-time costs + first month operating costs + contingency
Monthly burn rate = total monthly operating costs
Net burn = monthly burn − monthly revenue
Runway (months) = available funding ÷ net burn
Break-even revenue = monthly operating costs (the revenue needed to cover all costs)
Runway assumes flat costs and revenue. Real startups typically see costs rise and revenue grow, so model conservatively.
What to include in startup costs
One-time costs include business registration and legal fees, equipment and hardware, initial inventory, website development, deposits, branding and design work, and any fit-out or installation costs. Monthly costs include staff salaries and contractor fees, rent and utilities, software subscriptions, marketing and advertising spend, insurance, and professional services retainers.
Frequently Asked Questions
How much runway should a startup aim for?+
Most advisors recommend a minimum of 12 months of runway at launch, with 18 months being a more comfortable target. This gives enough time to validate your business model, acquire initial customers, and make meaningful iterations before running out of cash. If you are raising investment, you typically want enough runway to close the next funding round, which can take 6 to 9 months from the start of the process. Building in a contingency buffer of 15 to 25 percent on your estimated costs is also standard practice, as first-year costs almost always exceed initial estimates.
What is the difference between burn rate and net burn?+
Gross burn rate is the total monthly cash outflow, meaning all your operating costs before any revenue. Net burn is gross burn minus monthly revenue. If you spend $10,000 per month and generate $3,000 in revenue, your gross burn is $10,000 and your net burn is $7,000. Runway should always be calculated using net burn because revenue reduces the rate at which you consume cash. At break-even, net burn reaches zero and your cash balance no longer decreases.
What is break-even and how do I reach it faster?+
Break-even is the monthly revenue level at which your income exactly covers all operating costs. Below break-even you are consuming cash; above it you are generating a surplus. To reach break-even faster you can either increase revenue (pricing, volume, faster sales cycles) or reduce costs (defer non-essential hires, find cheaper suppliers, cut subscriptions not driving growth). Most early-stage startups focus on reducing costs first because it provides faster, more predictable improvement to the runway than revenue growth.
Should I include my own salary in startup costs?+
Yes. If you plan to pay yourself a salary from the business, it should be included as a monthly operating cost. Many founders exclude their own salary to make the numbers look better, but this understates the true cost of the business and produces an overly optimistic runway and break-even figure. If you genuinely plan to take no salary during the early period, you can set it to zero, but be realistic about how long that is sustainable. Unpaid founder time is often the largest hidden cost of a startup.
Why add a contingency buffer?+
No startup cost estimate is ever fully accurate. Equipment costs more than expected, legal fees run over, launches get delayed, and unexpected expenses appear in every business. A 15 to 25 percent contingency buffer on estimated costs gives you a realistic picture of the funding you need. Without a buffer, a single surprise expense can reduce your runway significantly. Investors and advisors will also expect to see a contingency line in any financial projection, and the absence of one signals inexperience with how businesses actually operate.