A startup cost calculator helps founders and small business owners estimate every expense before they open their doors. From one-time setup costs to recurring monthly overhead, this tool creates a realistic financial picture so you can plan funding needs and avoid running out of cash.
How to Use This Calculator
- List all one-time startup costs — legal fees, equipment, initial inventory, website development, licenses.
- List all monthly operating costs — rent, salaries, software subscriptions, utilities, marketing.
- Enter how many months of runway you want before reaching profitability.
- Click Calculate to see total capital required and monthly burn rate.
What This Calculator Measures
- One-time costs — Expenses you pay once at launch: incorporation, branding, equipment, deposits.
- Monthly burn rate — Total recurring expenses per month before revenue.
- Runway — How many months your capital will last at the current burn rate.
- Total capital needed — One-time costs + (monthly burn × runway months).
Formula or Logic
Monthly Burn Rate = Sum of all recurring monthly expenses
Total Capital Needed = One-Time Costs + (Monthly Burn Rate × Desired Runway in Months)
Most advisors recommend 12–18 months of runway to give a startup enough time to find product-market fit and reach revenue milestones.
Example Calculations
Example 1: One-time costs = $15,000. Monthly expenses = $8,000. Desired runway = 12 months. Total needed = $15,000 + ($8,000 × 12) = $111,000.
Example 2: E-commerce startup with $5,000 setup costs and $3,500/month overhead seeking 6 months runway → $5,000 + $21,000 = $26,000 needed.
Understanding Your Results
The total capital figure should inform your fundraising or savings goal. Add a 20–30% buffer for unexpected costs — most first-time founders underestimate expenses significantly.
Common Mistakes to Avoid
- Forgetting one-time costs like security deposits, business registration, and professional services.
- Underestimating time to first revenue — many startups take 6–12 months longer than projected.
- Ignoring the owner's own salary in the burn rate calculation.
- Not accounting for seasonality or slow months in early operations.