Running an online store is fundamentally a math problem. Every decision — what to price, when to discount, whether to expand to Amazon — has a number behind it. These 8 free calculators give you those numbers in seconds.
The 8 calculators and when to use each
1. Shopify Profit Calculator
Use this before setting a product price or after a month of sales to understand your true net margin. It accounts for Shopify's payment processing fee (2.9% + 30¢ on Basic), transaction fee (0.5–2% if not using Shopify Payments), outbound shipping, product cost, marketing spend, packaging, refund rate, and app costs.
Most sellers are surprised: a $50 product with a healthy gross margin can have a net margin below 15% once every cost is included.
2. Amazon FBA Calculator
Amazon's fee structure has multiple layers. This calculator combines referral fees (8–15% by category), FBA fulfillment fees (by size tier), monthly storage fees, inbound shipping to Amazon, advertising costs, and return rates. Enter your selling price and costs to see your net profit per unit.
3. Profit Margin Calculator
Calculates gross, operating, and net profit margins with a full expense waterfall. Use it to understand how each cost layer erodes revenue — and which costs have the most leverage.
4. Break-Even Calculator
Formula: Break-Even Units = Fixed Costs ÷ (Selling Price − Variable Cost per Unit)
Enter your monthly fixed costs (rent, salaries, software) and your contribution margin per unit to see exactly how many units you need to sell before making a profit.
5. GST Calculator India
Supports all four Indian GST slabs (5%, 12%, 18%, 28%) with CGST/SGST/IGST split for intra-state and inter-state transactions, in both inclusive and exclusive modes.
6. VAT Calculator (GCC)
Handles UAE (5%), Saudi Arabia (15%), Bahrain (10%), Oman (5%), and custom rates. Add VAT to a net price or extract VAT from a VAT-inclusive price.
7. Discount Calculator
Find the sale price from a percentage off, reverse-calculate the original price from a sale price, or calculate stacked discounts (e.g., 20% off + extra 10%).
8. Pricing Calculator
Find the optimal price using three strategies: cost-plus (cost × markup), competitive (position relative to competitor price), and value-based (what the customer is willing to pay). Compare all three side by side.
Which calculator should you start with?
- Just launched on Shopify: Start with the Shopify Profit Calculator to verify your pricing covers all costs.
- Evaluating Amazon FBA: Use the Amazon FBA Calculator to compare net profit against your Shopify margins.
- Planning a launch: Run Break-Even first to know your minimum viable sales volume, then use Pricing to set the right price.
- Selling in India or GCC: Use GST or VAT calculators to verify your listed prices are correct for your customers' region.
All 8 ecommerce calculators — free, no signup, instant results:
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