QuickBooks Bookkeeping for Amazon FBA & Shopify | Thelonex
Quick, no-signup calculators for the numbers ecommerce sellers check most often — profit margin, sales tax, FBA fees, break-even, and more. Results update instantly, right in your browser.
Enter your cost and selling price to see your margin and markup instantly.
Work out sales tax owed and total price for any subtotal and tax rate.
See your real profit per unit after Amazon's referral and fulfillment fees.
Find out how many units you need to sell each month to cover your costs.
Estimate Social Security and Medicare withholding on any gross paycheck.
Know exactly when to reorder stock based on sales pace and lead time.
Yes, completely free, no signup or email required. They run in your browser and nothing you type is saved or sent anywhere.
They're solid estimates for planning purposes using standard formulas. Your actual numbers can vary by state, entity type, and fee structure — treat results as a starting point.
No. It only estimates Social Security and Medicare (FICA) withholding, not federal or state income tax, which depends on each employee's W-4 and location.
Yes — book a free 30-minute consultation and a QuickBooks-certified specialist can walk through your specific numbers with you.
