Free toolkit
Free tools for ecommerce operators
Calculators, checkers and generators that surface the money quietly leaking out of your shipping and post-purchase operations — overcharges, returns, chargebacks, surcharges and more. Every tool is free and works without an account.
Cost & rates
Shipping Savings Calculator
See how much you could save by switching to discounted carrier rates.
Carrier Invoice Audit
Estimate the refunds and overcharges hiding in your UPS/FedEx/USPS bill.
Dimensional Weight Calculator
Find the billable DIM weight carriers will charge before the invoice lands.
Carrier Surcharge Checker
See which accessorial surcharges apply and how much they add.
Freight Class Calculator
Get your NMFC freight class from pallet weight and dimensions.
Landed Cost & Duty Calculator
Estimate import duties, taxes and fees so you can price DDP.
Cheapest Way to Ship
Compare USPS Flat Rate with Ground Advantage and Priority Mail prices by zone.
USPS Zone Chart
Estimate the USPS zone between two ZIP codes or see a zone chart for your origin.
Shipping documents
Bill of Lading Generator
Fill out a BOL for LTL or truckload freight and download a print-ready PDF.
Commercial Invoice Generator
Make a customs-ready commercial invoice with HS codes, plus CN 22/CN 23-style declarations.
Packing List Generator
List packages, contents, weights, dimensions and total cube, then download a PDF.
Packing Slip Generator
Create a branded packing slip with your logo, items and return instructions.
Packaging & freight space
Cubic Feet Calculator
Get cubic feet, cubic meters and freight density for boxes, cylinders and shipments.
CBM Calculator
Total cubic meters, air chargeable weight and containers needed for a shipment.
Pallet Calculator
How many cartons fit on a pallet, layer by layer, within height and weight limits.
Container Load Calculator
Cartons or pallets per 20ft, 40ft, high cube container or 53ft trailer.
Box Size Calculator
Find the smallest box for your items, its DIM weight and Flat Rate boxes that fit.
Moving Box Calculator
Estimate how many moving boxes of each size you need, plus tape and paper.
USPS Box Sizes
Every USPS Flat Rate box and envelope size with prices, plus a box finder.
Marketplace seller fees
eBay Fee Calculator
Final value fees by category, per-order fee, payout and profit for an eBay sale.
Amazon FBA Calculator
2026 referral and FBA fulfillment fees, peak rates and storage, FBA vs FBM profit.
Etsy Fee Calculator
Listing, transaction, processing and Offsite Ads fees with your profit per sale.
Poshmark Fee Calculator
See Poshmark’s cut and what you earn after shipping discounts.
Mercari Fee Calculator
Mercari’s 10% selling fee, Instant Pay and your profit.
Walmart Seller Fees Calculator
Walmart Marketplace referral fees and WFS fulfillment fees per sale.
Shopify Fee Calculator
Card processing, transaction fees and plan cost per Shopify order.
Customs & trade
HTS Code Lookup
Search the full US Harmonized Tariff Schedule by product or code, with duty rates.
De Minimis & Tariff Checker
US de minimis status and the Section 301/232 tariffs that may apply to an import.
Incoterms® 2020 Chart
Who pays freight, carries the risk and clears customs under all 11 rules, plus a rule selector.
Labels, barcodes & addresses
Barcode Generator
UPC, EAN, Code 128, Code 39, ITF-14 and QR codes as SVG, PNG, PDF or label sheets.
SKU Generator
Readable SKUs for every size, color and model combination, with CSV export.
ZIP Code Lookup
City, state and county for any ZIP code, or every ZIP code for a city.
Free Address Verification
Check that a US address is deliverable and get it standardized with the ZIP+4.
Return Address Labels
Printable return address label sheets (30, 80 or 10 per sheet) with an optional logo.
4×6 Shipping Label Template
Address labels with box numbering, a reference barcode and handling marks. No postage.
Returns & disputes
Compliance & policies
Want us to find the leaks for you?
Connect your store or send a recent carrier invoice and we’ll run a free profit-leak audit — overcharges, late-delivery refunds, chargeback risk, return leakage and surcharge errors.