Free FBA tools
Amazon FBA Calculators
Free, interactive calculators for the inventory math every Amazon FBA seller runs: when to reorder, how much buffer to hold, and how much to order. Each runs entirely on the numbers you type. No login, no ASIN, nothing stored, and free to embed on your own site.
New here? Start with the FBA restock calculator to find your reorder point, then read the reorder point guide and safety stock guide for the full walkthrough.
Inventory planning
EOQ Calculator
Find the order quantity that minimizes combined ordering and holding cost, with a live cost curve.
Open calculatorFBA Restock Calculator
Get your Amazon reorder point, safety stock, and exactly how many units to send to FBA from your sales velocity and real lead times.
Open calculatorInventory Turnover Calculator
Get your inventory turnover, days of inventory (DSI), and GMROI from your sales, average stock, cost, and price, with a health benchmark.
Open calculatorReorder Point Calculator
Apply the reorder point formula: lead-time demand plus safety stock, so you know the exact stock level that should trigger your next order.
Open calculatorSafety Stock Calculator
Size the buffer that keeps you in stock through demand swings, using the statistical service-level formula.
Open calculatorSell-Through Rate Calculator
See what share of a shipment has sold, how fast it's moving, and how many days until the rest clears, from your units sent and sold.
Open calculatorFees and cost
FBA Fee Calculator
Get the 2026 FBA fulfillment and referral fees for your product from its size, weight, and price, with the size tier classified for you.
Open calculatorFBA Profit Calculator
See your net profit, margin, ROI, and break-even price per unit after Amazon fees and your costs.
Open calculatorFBA Reimbursement Calculator
Estimate the FBA reimbursements Amazon may owe you for lost and damaged inventory, and whether a recovery service is worth its cut.
Open calculatorFBA Storage Fee Calculator
See your monthly FBA storage cost and the Q4 peak swing from your product size, and what it costs to hold a batch across the season.
Open calculatorImport Duty & Customs Fee Calculator
Estimate what US customs collects on your shipment: duty, Section 301 tariffs, and the MPF and HMF user fees, per shipment and per unit.
Open calculatorLanded Cost Calculator
Roll supplier price, freight, duty, and prep into your true per-unit landed cost, ready to drop into the profit calculator.
Open calculatorShipping and operations
CBM Calculator
Turn carton dimensions and count into shipment volume in cubic meters, the number your freight forwarder quotes on, with container fill.
Open calculatorChargeable Weight Calculator
See whether air, courier, or sea freight bills your shipment on actual weight or volume, with the volumetric weight for each mode.
Open calculatorContainer Check Digit Validator
Check an ISO 6346 container number's check digit, or compute the missing one, before a mistyped container number stalls your booking.
Open calculatorFBA Pallet Calculator
Fit your master cartons to Amazon's 40x48 pallet rules, including the 72 inch height and 1,500 lb weight caps, and count pallets for your LTL shipment.
Open calculatorFreight & Container Load Calculator
Turn a unit count into master cartons, shipment volume (CBM), and weight, and see how it fills a 20ft, 40ft, or 40ft high-cube container.
Open calculatorUPC & Barcode Validator
Check a UPC, EAN, or GTIN check digit, or compute the missing one, before you create an Amazon listing with a bad barcode.
Open calculatorInventory Hero
Run this math automatically for every SKU
Log in and Inventory Hero already knows each SKU's sales velocity, demand variability, and lead time, so it tells you what to reorder and when, and keeps it current as your sales and suppliers change.
14-day free trialNo credit card required.