14 free tools · no sign-up

Free calculators for Amazon, eBay, Etsy and Shopify sellers

Price a product, plan stock and cash, and trace payout gaps. Each tool runs in your browser and shows the formula it uses.

Marketplace fees and profit

Know what each order leaves after marketplace and payment fees.

  • Amazon profit calculator

    Compare FBA and FBM profit, margin, ROI on landed cost, and break-even prices using your entered fees and costs.

  • eBay profit calculator

    Estimate selling fees, proceeds, contribution profit, and a break-even item price after your direct costs.

  • Etsy fee and profit calculator

    Estimate US Etsy order fees, proceeds after fees, contribution profit, and a break-even item price.

  • Shopify fee calculator

    Estimate your monthly Shopify subscription and Shopify Payments card fees by plan, billing period and average payment.

  • Stripe fee calculator

    Estimate processing fees and net amounts, or find a charge for your target using U.S. card, ACH and custom rates.

Pricing and advertising

Set prices, test a discount, and cap what ads can cost.

Inventory and cost of goods

Turn shipments into unit costs and plan when to reorder.

  • Landed cost calculator

    Break down one shipment’s product, freight and import costs into a batch total and average cost per unit.

  • Cost of goods sold calculator

    Calculate period COGS from opening inventory, net purchases and closing inventory at cost.

  • Inventory turnover calculator

    Calculate period turns and days in inventory from costs. Use a provided average and compare your own target.

  • Reorder point calculator

    Set a SKU reorder trigger from demand, lead time and safety stock. Compare inventory position with stock physically available.

Cash and reconciliation

Plan cash and trace why a deposit looks wrong.

  • Cash flow planner

    Compare 13 weeks of cash receipts and payments. Test payout delays, inventory spending and gaps below your chosen buffer.

  • Payout mismatch checker

    Compare a payout breakdown, platform total and bank entry. Separate the differences and download a local worksheet.

Templates and comparisons

Templates, fee guides, and cost comparisons.

  • Ecommerce chart of accounts template

    Adapt an editable CSV account list for sales, clearing accounts, fees, refunds, inventory, and operating costs.

  • eBay fee calculator

    See the existing fee estimator and its assumptions in the eBay seller fee guide.

  • A2X cost comparison

    Compare the published plan costs used by the existing A2X and Taxomate pricing calculator.

Formulas shown on every page

Each tool explains its math and its assumptions, so you can compare the estimate with your marketplace reports.

From an estimate to your books

A payout combines sales, refunds, and fees from different dates. See the integration guides or find help in the accountant directory.

Private by default

The calculators run in your browser. No account and no email needed.