Starting a Business? Here's How to Calculate If It'll Be Profitable
For informational purposes only, not financial advice. Full disclaimer
Passion doesn't pay the bills — profit does. Before you invest your savings and quit your job, you need to answer one question: can this business actually make money? Not "do I think it could eventually make money" but "do the numbers work right now?" Here's how to run those numbers honestly.
I have started, scaled, and invested in businesses across EdTech, DefTech, premium merchandise, and mobile apps (some reaching nine-figure annual revenue). The one constant across all of them: the businesses that survived were the ones where I ran honest financial projections before committing capital. The ones that failed were the ones where I let excitement outrun arithmetic.
Alex B.
Step 1: Calculate Your Break-Even Point
Your break-even point is the minimum sales volume needed to cover all costs — no profit, no loss. You need three numbers: fixed costs per month (rent, utilities, insurance, software, loan payments), variable cost per unit (materials, shipping, transaction fees), and selling price per unit.
Break-Even Units = Fixed Costs / (Price per Unit - Variable Cost per Unit)Example Calculation
You're opening an online store selling handmade candles. Monthly fixed costs: $3,200 (workspace rent, website, insurance, marketing). Each candle costs $8 to make and sells for $28.
- Contribution margin per candle: $28 - $8 = $20
- Break-even: $3,200 / $20 = 160 candles per month
- That's about 5-6 candles per day, every day
- At $28 each, you need $4,480 in monthly revenue just to break even
You need to sell at least 160 candles per month ($4,480 revenue) to cover costs. Every candle beyond 160 generates $20 in profit. To earn $40,000/year, you need 160 + (3,333/20) = 327 candles per month.
Enter your fixed costs, variable costs, and selling price to instantly see how many units you need to sell to cover your expenses.
Try Break-Even CalculatorStep 2: Estimate Realistic Revenue
Most new businesses overestimate revenue and underestimate costs. Use these reality checks:
- Research what similar businesses actually earn (not what they claim on social media)
- Plan for 50% of your optimistic projection — if that number still works, you're in good shape
- Expect no revenue in month 1-2, building slowly through months 3-6
- Factor in seasonality — many businesses have slow months
- Account for returns, refunds, and non-paying customers (typically 2-10%)
Step 3: Know Your Target Margins
Healthy profit margins by business type:
- Service businesses (consulting, freelancing): 50-80% gross, 15-30% net
- E-commerce: 40-60% gross, 10-20% net
- Software/SaaS: 70-90% gross, 15-25% net
- Restaurants: 55-65% gross, 3-9% net
- Retail: 25-50% gross, 2-5% net
- Manufacturing: 25-35% gross, 5-10% net
If your projected margins are below these benchmarks, re-evaluate your pricing, costs, or business model before launching.
Step 4: Calculate Your Startup Runway
Runway is how long your savings can sustain you before the business needs to be profitable. Most businesses take 6-18 months to reach profitability. Calculate: Monthly burn rate (fixed costs + your personal expenses), Savings available for the business, Runway = Savings / Monthly burn rate. If your runway is under 12 months, you need more savings or a plan to earn income while building.
Red Flags: When the Numbers Don't Work
- Break-even requires more customers than your market can realistically provide
- Your margins are thin and a small cost increase makes you unprofitable
- You need more than 18 months to reach profitability and don't have the runway
- Your price point is above what competitors charge and you don't have a clear differentiator
- Customer acquisition cost exceeds the profit from a single sale (and customers don't repeat)
After two decades of building and funding companies, the single best predictor of business survival I have found is this: how quickly the founder can identify and respond to a red flag in their unit economics. The founders who check their numbers monthly and adjust survive. The founders who wait for quarterly reports to tell them something is wrong rarely make it.
Alex B.
Don't forget to include your own salary as a fixed cost. If you need $50,000/year to live, that's $4,167/month the business must generate above all other costs before it's truly "profitable." A business that covers costs but can't pay its owner is just an unpaid job.
Bottom Line
Calculate your break-even point before spending a dollar. If the math works — your break-even is achievable, your margins are healthy, and you have 12-18 months of runway — move forward with confidence. If the numbers are tight, don't ignore them. Either fix the model (raise prices, cut costs, find cheaper suppliers) or start the business as a side project while keeping your day job until revenue proves the concept.
Frequently Asked Questions
How do I know if my business idea is profitable?+
How long until a new business is profitable?+
What is a good profit margin for a small business?+
Related Calculators
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Consult a qualified financial advisor for decisions about your specific situation.