Ecommerce Calculators
& Tools
Free interactive tools for product images, inventory, shipping, and multichannel operations. No signup required.
Safety Stock Calculator
Calculate optimal safety stock levels and reorder points to prevent stockouts while minimizing excess inventory holding costs.
Inventory Turnover Calculator
Measure how efficiently you sell and replace inventory with turnover ratio, days of inventory, and industry benchmark comparisons.
DIM Weight & Packaging Analyzer
Calculate DIM weight across all carriers, compare standard box sizes, optimize packaging, and check FBA size tier boundaries.
SKU Generator
Generate well-structured SKU codes following industry best practices. Input product attributes and get formatted SKU suggestions instantly.
Demand Forecaster
Project future order volumes for the next 12 months based on historical sales data, growth trends, and seasonal patterns.
Multichannel Profit Calculator
Compare profit per unit across Amazon, eBay, Shopify, and Walmart. Factor in marketplace fees, shipping costs, and product costs.
ROI Calculator
Calculate the return on investment of switching to Nventory. Estimate time saved, error reduction, and revenue recovered from stockouts and oversells.
Multichannel Readiness Assessment
Evaluate whether your business is ready to scale to multichannel selling. Get a readiness score across inventory, operations, technology, and strategy.
Barcode Generator
Generate barcodes in 8 formats including QR Code, EAN-13, UPC-A, and Code-128. Download as PNG, SVG, or JPEG for labels and packaging.
Purchase Order Generator
Create professional purchase orders with line items, addresses, and terms. Download as PDF or print directly from your browser.
Shipping Label Generator
Create shipping labels with sender and recipient addresses, tracking numbers, and service types. Download as PDF or print directly.
Packing Slip Generator
Generate packing slips with order details, line items, and shipping quantities. Download as PDF or print for your shipments.
Reorder Point Calculator
Calculate your reorder point and safety stock using daily usage and lead time. Download a PDF report with the formula breakdown.
Break-Even Calculator
Calculate your break-even point in units or revenue. Enter fixed costs, variable costs, and price per unit to see when you start profiting.
Wholesale Price Calculator
Calculate wholesale pricing from cost, overhead, and profit margin. Supports 8 currencies. Download a PDF report with the full formula breakdown.
EOQ Calculator
Calculate Economic Order Quantity using annual demand, order cost, and holding cost. Download a PDF report with a worked example.
Marketplace Image Resizer
Resize product photos to exact marketplace specifications. Supports Amazon, eBay, Shopify, Etsy, Walmart, and TikTok Shop with batch processing.
Product Background Remover
Remove backgrounds from product photos using AI. Replace with pure white for Amazon compliance, transparent, or custom colors. Fully client-side.
Marketplace Image Compliance Checker
Check if your product images meet marketplace requirements. Validates dimensions, file size, format, background color, and text overlay compliance.
Product Image Watermarker
Add logo or text watermarks to product images in bulk. Control position, opacity, size, and tiling. Protect your product photos from theft.
Bulk Product Image Compressor
Compress product images to meet marketplace file size limits. Presets for Amazon, eBay, Shopify, and Etsy with quality control and batch processing.
Product Image Collage Maker
Create product image collages for marketplace listings. Templates for multi-angle views, what's-in-the-box shots, and feature callouts.
Marketplace CSV Converter
Upload a product CSV from one marketplace and download it reformatted for another. Supports Shopify, Amazon, eBay, Walmart, Google Shopping.
Product Feed Validator
Upload your product feed CSV and validate every row against marketplace-specific rules. Catches errors before submission.
Bulk Price Adjuster
Upload product CSV, apply pricing rules (percentage, fixed, rounding, floor/ceiling), see every change, download modified file.
GTIN Batch Validator
Paste or upload thousands of GTINs, UPCs, or EANs and validate check digits, detect format, and lookup country of origin instantly.
Listing Bulk Checker
Upload a CSV of product listings and check every title and description against marketplace compliance rules.
Order Data Merger
Upload order CSVs from multiple sales channels, merge and deduplicate into one unified file with normalized data.
FBA Size Tier Explorer
Interactive 3D visual — adjust product dimensions and weight, see Amazon FBA size tier and fees update in real-time with boundary alerts.
Image URL Bulk Checker
Paste or upload product image URLs and check every one for accessibility, dimensions, and marketplace compliance.
Need more than calculators?
Automate your operations.
You just ran the numbers. Now let Nventory handle the execution — sync inventory, route orders, and prevent overselling across every channel.