Free tool
Startup Cost Calculator
One-time setup, product, and months of operating — your real launch budget.
Most founders budget for the obvious one-time costs and forget the months of operating spend before revenue shows up. This calculator adds both into the real number you need to launch and survive.
The number founders most often underestimate is the months of operating costs — add a buffer, because everything takes longer and costs more than the plan says.
Total to launch = one-time setup + product or inventory build + (monthly operating costs × the months you fund up front before revenue or a raise).
The part people underestimate is the operating months, not the setup. Rent, tools, and your own time keep costing money long after launch day, and revenue almost always arrives later than planned.
Add a buffer to whatever the calculator says. A common rule is to budget for more months than you think you'll need, because everything in a startup takes longer and costs more than the plan.
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Common questions
How much does it cost to start a business?
It depends entirely on the type, but the honest figure is one-time setup plus product build plus several months of operating costs before revenue covers you. The operating months are the part most founders underestimate. Enter your numbers above for a real total.
What startup costs do founders forget?
The ongoing operating costs between launch and revenue. Setup costs are visible and easy to plan, but rent, software, and your own runway keep burning for months while sales ramp up slower than expected — so budget several months of operating spend up front.
How much buffer should I add to my startup budget?
Budget for more months of operating costs than you think you'll need. Things consistently take longer and cost more than planned, so a buffer on the operating-months figure is the cheapest insurance against running out at the worst time.