Side Business Revenue Calculator

This tool helps entrepreneurs, e-commerce sellers, and small business owners estimate monthly and annual revenue for side ventures. It factors in sales volume, pricing, and common business expenses to show net profit. Use it to validate pricing strategies or forecast growth for your side hustle.
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Side Business Revenue Calculator

Revenue Breakdown

Gross Monthly Revenue
Total Monthly COGS
Total Monthly Sales Fees
Total Monthly Expenses
Net Monthly Profit (After Tax)
Projected Annual Net Profit
Net Profit Margin
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How to Use This Tool

Follow these steps to generate an accurate revenue estimate for your side business:

  1. Select your preferred currency from the dropdown menu to format all monetary values.
  2. Enter your average price per unit sold (e.g., $29.99 for a handmade product).
  3. Input your average monthly sales volume (total number of units sold per month).
  4. Add your cost of goods sold (COGS) per unit, including materials and direct labor.
  5. List your monthly fixed expenses, such as software subscriptions, marketing costs, or shipping supplies.
  6. Enter your sales channel fee rate (e.g., 15% for Etsy, 3% for Stripe, 8% for Amazon FBA).
  7. Input your estimated combined tax rate (self-employment tax plus income tax, e.g., 25% for US-based sellers).
  8. Click the Calculate Revenue button to view your detailed breakdown.
  9. Use the Reset button to clear all fields and start a new calculation.

Formula and Logic

This calculator uses standard small business revenue and profit formulas to generate accurate results:

  • Gross Monthly Revenue = Average Price Per Unit × Monthly Sales Volume
  • Total Monthly COGS = COGS Per Unit × Monthly Sales Volume
  • Total Monthly Sales Fees = Gross Monthly Revenue × (Sales Channel Fee Rate ÷ 100)
  • Total Monthly Expenses = Total Monthly COGS + Total Monthly Sales Fees + Monthly Fixed Expenses
  • Net Monthly Profit (Before Tax) = Gross Monthly Revenue - Total Monthly Expenses
  • Net Monthly Profit (After Tax) = Net Monthly Profit (Before Tax) × (1 - (Tax Rate ÷ 100))
  • Projected Annual Net Profit = Net Monthly Profit (After Tax) × 12
  • Net Profit Margin = (Net Monthly Profit (After Tax) ÷ Gross Monthly Revenue) × 100

All calculations round to two decimal places for currency values and two decimal places for percentages.

Practical Notes

Apply these real-world business benchmarks and tips to interpret your results:

  • Healthy side business profit margins typically range from 10% to 20%. Margins below 5% indicate a need to adjust pricing, reduce COGS, or cut fixed expenses.
  • Common sales channel fee rates: Etsy (15% including transaction and listing fees), Amazon FBA (8-15% depending on category), Shopify (2.9% + 30¢ per transaction via Stripe), Fiverr (20% service fee).
  • Fixed expenses for side businesses often include website hosting ($10-$30/month), email marketing tools ($15-$50/month), paid social media ads ($50-$500/month), and shipping supplies ($20-$100/month).
  • US-based sellers should account for 15.3% self-employment tax plus federal and state income tax (total 20-35% combined for most side hustle income brackets).
  • COGS includes only direct costs tied to each unit sold: raw materials, packaging, and labor for production. Do not include fixed expenses in COGS.

Why This Tool Is Useful

Side business owners often overestimate revenue by ignoring hidden fees and expenses. This tool eliminates guesswork by:

  • Factoring in often-overlooked costs like sales channel fees and taxes that eat into profit.
  • Providing a clear profit margin metric to validate pricing strategies before launching a new product.
  • Allowing quick scenario testing: adjust price, volume, or expenses to see how changes impact annual profit.
  • Generating a copyable breakdown to share with co-founders, accountants, or investors.

Frequently Asked Questions

What counts as a fixed expense for my side business?

Fixed expenses are costs that remain consistent month-to-month regardless of sales volume. Examples include website hosting, software subscriptions (e.g., Canva Pro, QuickBooks), monthly marketing retainers, rent for a workspace, and insurance. Variable costs like COGS or per-transaction fees are not included in fixed expenses.

How do I estimate my sales channel fee rate?

Check your sales platform's fee schedule: Etsy charges a 6.5% transaction fee plus 20¢ per listing and 3% + 25¢ payment processing fee. Amazon FBA fees vary by product category (8-15% referral fee plus fulfillment fees). For direct sales via your own website, use your payment processor's rate (e.g., Stripe's 2.9% + 30¢).

Is this calculator accurate for international side businesses?

Yes, use the currency selector to format results for your local currency. Note that tax rates, sales channel fees, and COGS costs vary by country: EU sellers must account for VAT (19-25% depending on country), while Canadian sellers need to factor in GST/HST. Adjust inputs to match your local business environment.

Additional Guidance

Maximize the value of this calculator with these tips:

  • Track actual sales data for 3 months to get accurate volume and price inputs, rather than estimating.
  • Re-run calculations quarterly as you adjust pricing, add new products, or scale marketing spend.
  • If your profit margin is below 10%, test raising prices by 5-10% to see how it impacts sales volume and profit.
  • Use the projected annual profit to set aside tax savings monthly, avoiding a large bill at tax time.