Useful tools for
people who sell online.
THE FIRST COLLECTION
Tools for people who sell online.
Plan inventory, price smarter, improve marketplace listings, and prepare better product creative without another login.
CSV to Excel Converter
Convert a local CSV into a real Excel workbook. Preview the rows before downloading an XLSX file, with every cell stored as literal text to protect codes and formula-like values.
Contact Sheet Generator
Arrange local product photos into a labeled contact sheet. Choose the grid, edit the captions, and download one PNG with each original image fitted inside its cell.
Batch Barcode Generator
Create a batch of Code 128 labels from one internal code per line. Preview each label, then download a ZIP of SVG and PNG files with a row-to-code manifest.
JSON to CSV Converter
Turn a local JSON object or record array into a downloadable CSV. Preview the union of its columns, preserve string identifiers, and keep nested values in one JSON cell.
Sales Commission Calculator
Calculate flat or progressive two-tier commission from rates you declare. See the bracket amounts, effective commission rate and optional base pay without applying tax or inventing a compensation plan.
Cost of Quality Calculator
Total prevention, appraisal, internal failure and external failure costs for one scope. See the cost of good quality, cost of poor quality and share of matched sales without inventing avoided losses.
Labor Cost per Unit Calculator
Allocate wages and a burden rate you declare across completed units. See direct wages, added burden, total labor cost and labor minutes per unit for one production run.
ITF-14 Barcode Generator
Generate an ITF-14 barcode from a 13-digit body or a valid 14-digit GTIN. Check the digit, inspect the exact identifier, and download local SVG or PNG artwork.
Manufacturing Lead Time Calculator
Build a manufacturing time ledger from queue, setup, run, move and wait totals. See the run-time share, working-day equivalent and a declared queue-reduction scenario.
Accounts Payable Turnover Calculator
Measure payables turnover from net credit purchases and average accounts payable. Use your actual reporting-period length to show the matching days equivalent.
Inventory Barcode Generator
Turn your internal inventory code into a browser-local Code 128 barcode. Download the label as SVG or PNG without sending the code to a server.
Meta Description Length Checker
Count the Unicode characters, words and UTF-8 bytes in your meta description, then inspect an estimated single-line text width. Google decides the final snippet and may rewrite it.
Price Tag Generator
Create printable price tags from the product name, price and currency you enter. Preview the labels locally, then print or save the sheet through your browser.
Google Sheets Barcode Generator
Validate an internal Code 39 value and get a copy-ready Google Sheets formula. Preview the barcode locally, then apply the Libre Barcode 39 font to the formula cell in Sheets.
LIFO Ending Inventory Calculator
Allocate one sale across up to three purchase layers using last-in, first-out arithmetic. See ending inventory cost, cost of goods sold and the units left in each layer.
Unit Price Calculator
Compare the cost per unit of two packs using the same measurement unit. See which pack is cheaper per unit and how much the difference amounts to.
Sales Growth Calculator
Measure the percentage and absolute sales change between two matched periods. Keep currency, reporting scope and period length aligned before comparing the result.
Retention Rate Calculator
Calculate customer retention from the customers you started with, ended with and acquired during one reporting period. Use a consistent customer definition and exclude new customers from the retained cohort.
Economic Production Quantity Calculator
Calculate a production lot size when replenishment happens gradually. Enter annual demand, working days, daily production rate, setup cost and annual holding cost to inspect the EPQ assumptions and cost balance.
Buy One Get One Free Calculator
Count complete buy-one-get-one-free pairs for identical-price items. See the payable total, free items, effective discount and merchandise contribution, with odd leftover items charged at full price.
Amazon ACOS Calculator
Calculate Amazon ACOS, reciprocal ROAS, and the gap from a declared break-even ceiling.
Freight Class Density Calculator
Calculate LTL density and map it to the current NMFTA 13-subprovision density guideline.
Photo Licensing Fee Calculator
Model a photo license from your own base creative fee and explicit usage multipliers.
Amazon Conversion Rate Calculator
Calculate Amazon unit session percentage from matched ordered units and product sessions.
Google Sheets QR Code Generator
Generate a browser-local QR preview, PNG, and copy-ready Google Sheets formula.
Ad Spend Calculator
Plan an allowable campaign budget from declared revenue and ROAS or conversion and cost targets.
Cost Per Conversion Calculator
Calculate campaign cost per tracked conversion and model a declared target.
Lead Conversion Rate Calculator
Calculate lead-to-customer conversion for one matched cohort and model a declared target.
Etsy Conversion Rate Calculator
Calculate Etsy visit-to-order conversion for one matched Stats period.
FedEx Declared Value Calculator
Estimate the 2026 FedEx U.S. package declared-value charge with current tiers visible.
Cost Per Lead Calculator
Calculate CPL from matched campaign spend and recorded leads, with transparent target scenarios.
Shipping Insurance Calculator
Calculate an insurance charge from declared value and a rate or fixed fee you already know.
Email Bounce Rate Calculator
Calculate bounce rate and delivered messages from one email send, with a declared target scenario.
Retail Conversion Rate Calculator
Calculate physical-store conversion from matched transactions and visitor traffic.
Google Sheets Invoice Generator
Generate a safe copy-ready Google Sheets invoice table with transparent formulas from entered facts.
CPC Calculator
Calculate cost per click from campaign spend and clicks, with the exact arithmetic and matched-scope inputs visible.
Social Media Engagement Rate Calculator
Calculate social engagement rate from entered interactions and a declared reach, impressions, or follower denominator.
Email Open Rate Calculator
Calculate unique email open rate from delivered messages and unique opens while keeping tracking limitations visible.
Email Click-Through Rate Calculator
Calculate email click-through rate from unique clicks and delivered messages using one matched campaign scope.
Landing Page Conversion Rate Calculator
Calculate landing-page conversion rate from conversions and sessions or users in one declared reporting scope.
Pallet Calculator
Calculate carton fit, stack height, payload, utilization, and pallets required from your pallet and carton constraints.
Pallet Space Calculator
Estimate whole floor-level pallet positions from storage-zone area, pallet footprint, clearance, and aisle allowance.
Packing Slip Generator
Generate a print-ready packing slip from shipment facts entered in your browser without inventing prices or fulfillment claims.
Amazon Multi-Channel Fulfillment Fees Calculator
Estimate current U.S. Amazon MCF fulfillment fees by speed, size tier, shipping weight, order quantity, and applicable surcharges.
Stock-to-Sales Ratio Calculator
Calculate stock-to-sales ratio, stock as a percentage of sales, and the inverse sales-to-stock ratio for one matched period and basis.
Credit Card Processing Fee Calculator
Calculate card-processing fees, net receipt, effective rate, and a target-net gross charge from your actual quoted rate.
CPM Calculator
Calculate CPM, ad spend, or impressions from any two known campaign values.
CTR Calculator
Calculate click-through rate, clicks, or impressions from any two known campaign values.
Value of Inventory Calculator
Calculate total inventory value, unit count, and weighted unit cost from itemized SKU quantities and costs.
Google Sheets Purchase Order Generator
Generate a deterministic, copy-ready purchase-order table and formulas for Google Sheets from facts you enter.
PayPal Seller Fee Calculator
Estimate current U.S. PayPal seller fees, net receipt, and the gross charge needed for a target net amount.
GTIN Validator
Validate the length and GS1 modulo-10 check digit of GTIN-8, GTIN-12, GTIN-13, and GTIN-14 codes.
Walmart Profit Calculator
Calculate Walmart Marketplace contribution profit, margin, costs, and break-even sales from an editable order ledger.
UPS Shipping Insurance Cost Calculator
Estimate the 2026 UPS U.S. standard declared-value charge without mislabeling carrier liability as insurance.
Purchase Order Number Generator
Generate deterministic, sequential purchase order numbers from a prefix, optional date token, and padding rule.
Amazon FBA Profit Margin Calculator
Calculate Amazon FBA contribution profit, margin, ROI, and break-even price from a complete per-unit cost ledger.
Average Order Value Calculator
Calculate average order value and model revenue at a target AOV without implying guaranteed lift.
Shopify Profit Margin Calculator
Calculate Shopify per-order contribution profit, margin, ROI, and break-even price from editable fees and costs.
USPS Cubic Pricing Calculator
Calculate USPS cubic volume and tier, check basic parcel eligibility, and apply an entered published postage rate.
Weighted Average Perpetual Inventory System Calculator
Process purchases and issues in sequence to calculate moving weighted-average cost, COGS, and ending inventory.
Amazon Referral Fee Calculator
Estimate Amazon U.S. referral fees by category, tier, and minimum fee.
Shopify Fee Calculator
Estimate Shopify payment-processing and optional third-party transaction fees from editable rates.
TikTok Shop Profit Calculator
Calculate per-order TikTok Shop profit after product, platform, creator, fulfillment, shipping, and ad costs.
Depop Shipping Cost Calculator
Reconcile a Depop label, buyer-paid shipping, packaging, and packed weight without claiming a live quote.
Minimum Order Quantity Calculator
Model the cash, landed cost, sell-through, excess inventory, and profit impact of a supplier MOQ.
Container Loading Calculator
Estimate carton fit, payload limits, and practical utilization for common freight containers.
GMROI Calculator
Calculate gross margin return on inventory investment from direct or derived retail inputs.
USPS Dimensional Weight Calculator
Apply current USPS domestic dimensional-weight thresholds, rounding, and the 139 divisor.
Warehouse Space Utilization Calculator
Calculate usable warehouse volume, occupied capacity, target headroom, and pallet-slot equivalents.
eBay Store Fee Calculator
Compare current U.S. eBay Store subscriptions and fixed-price listing overage costs.
Image Metadata Checker
Inspect image file facts and selected JPEG Exif fields locally without uploading the photo.
Fulfillment Cost Calculator
Calculate monthly and per-order fulfillment cost from a transparent 3PL cost ledger.
Stripe Fee Calculator
Estimate a standard U.S. domestic online-card fee, net receipt, and reverse-calculated gross charge.
Weeks of Supply Calculator
Calculate how many weeks and days current saleable inventory can cover at a declared weekly sales rate.
Poly Mailer Size Calculator
Estimate minimum flat poly-mailer dimensions and round upward to a purchasing increment.
Etsy Shop Name Generator
Generate deterministic Etsy-ready shop names within the current 20-character naming rules.
Retail Margin Calculator
Calculate gross profit, gross margin, and implied markup without mixing the percentage bases.
Image DPI Converter
Change PNG density metadata or resample pixels locally, with print-size consequences shown before download.
Amazon FBA Storage Fee Calculator
Estimate one month of U.S. FBA storage from packaged volume, units, size tier, and month.
Inventory Holding Cost Calculator
Total capital, storage, service, and risk costs and calculate the annual carrying rate.
Economic Order Quantity Calculator
Calculate classic EOQ, estimated order frequency, and annual ordering and holding costs.
Volumetric Weight Calculator
Compare dimensional and actual parcel weight with an explicit carrier divisor.
Contribution Margin Calculator
Calculate contribution dollars, ratio, and per-unit contribution from a variable-cost ledger.
Print-on-Demand Profit Calculator
Calculate POD profit, margin, platform fees, ad headroom, and batch contribution.
Walmart Seller Fee Calculator
Estimate Walmart Marketplace referral fees and pre-other-cost payout from total sales price by category tier.
Landed Cost Calculator
Calculate total import-to-door cost and landed cost per unit from a transparent shipment ledger.
Safety Stock Calculator
Calculate a whole-unit inventory uncertainty buffer with a statistical or average-maximum method.
Customer Acquisition Cost Calculator
Calculate CAC from a complete acquisition-spend ledger and first-time paying customers in one period.
COGS Calculator
Calculate cost of goods sold from beginning inventory, period costs, and ending inventory.
Image File Size Calculator
Calculate uncompressed pixel-data size from dimensions, channels, bit depth, and image count.
Break-Even Units Calculator
Calculate the whole-unit sales threshold needed to cover declared fixed and variable costs.
Product Description Generator
Generate three factual ecommerce descriptions from supplied product details without invented claims.
Shipping Box Size Calculator
Calculate minimum inside box dimensions from product size, packing grid, and clearance.
Image Size Checker
Inspect image dimensions, aspect ratio, megapixels, format, and exact bytes locally against optional targets.
Packaging Cost Calculator
Calculate packaging cost per order and batch from materials, labor, waste, and fixed setup cost.
Markup to Margin Calculator
Convert markup to gross margin or margin back to markup, with a concrete product-pricing example.
eBay Title Generator
Generate deterministic eBay title drafts from supplied product details within the current 80-character limit.
Break-Even ROAS Calculator
Calculate the revenue ROAS required to cover ad spend from product contribution margin.
eBay Fee Calculator
Estimate current basic U.S. eBay final value fees and payout by supported category.
Shopify Image Resizer
Resize product images to a consistent square canvas with crop or contain controls.
Mercari Fee Calculator
Estimate the current U.S. Mercari seller fee and payout from item price and shipping.
Depop Fee Calculator
Estimate regional Depop selling and payment-processing fees without hiding region differences.
TikTok Shop Fee Calculator
Estimate U.S. TikTok Shop referral fees with an explicit category and optional program rate.
Poshmark Fee Calculator
Calculate the current U.S. Poshmark fee and payout across the $15 threshold.
Whatnot Fee Calculator
Estimate Whatnot commission, processing, and payout with separate fee bases by category.
SKU Generator
Generate consistent product and variant SKUs with readable codes and numbered sequences.
Sell-Through Rate Calculator
Calculate sell-through rate and unsold units for one inventory cohort and period.
Wholesale Price Calculator
Calculate wholesale and suggested retail prices from unit cost, margin, and retailer markup.
Inventory Turnover Calculator
Calculate inventory turnover and days on hand from COGS and average inventory value.
Image Aspect Ratio Calculator
Upload an image to detect its ratio automatically, or enter dimensions manually for a proportional target size.
Reorder Point Calculator
Calculate when to reorder inventory from daily sales, supplier lead time, and safety stock.
Etsy Banner Resizer
Resize Etsy shop banners, protect the mobile safe zone, and download the finished image.
Etsy Tag Generator
Turn a product description into 13 focused Etsy search tags.
Etsy Title Generator
Create readable, search-focused Etsy product title ideas in seconds.
Etsy Fee Calculator
Estimate listing, transaction, payment processing, and optional advertising fees.
Etsy Seller Cost Calculator
Combine Etsy charges with product and packaging costs to estimate total cost and take-home revenue.
Etsy Fee and Profit Calculator
Calculate Etsy fees, total costs, net profit, and margin in one view.
Etsy Price Calculator
Work backward from costs and target margin to find a sustainable listing price.
Etsy Profit Calculator
Estimate the earnings and profit margin left after Etsy fees and product costs.
Etsy Shipping Cost Calculator
Estimate package shipping costs across domestic and international routes.
ROAS Calculator
Calculate realized return on ad spend from attributed revenue and advertising cost.
Warehouse Storage Cost Calculator
Calculate monthly warehouse storage cost and allocate it per unit and order.
Grailed Seller Fee Calculator
Estimate current Grailed commission, processing fees, and seller payout.
Amazon Dimensional Weight Calculator
Compare Amazon US dimensional and packaged scale weight for fee planning.
Depop Boosting Fee Calculator
Estimate current Depop Boosted Listings fees and compare boosted payout.
Square Processing Fee Calculator
Estimate current public U.S. Square processing fees and net receipt by plan and payment route.
Days Sales Inventory Calculator
Calculate days sales of inventory, turnover, and daily COGS on one declared cost basis.
UPC Validator
Validate UPC-A and EAN-13 digit structure and GS1 check digits without a product lookup.
Cardboard Box Weight Calculator
Estimate corrugated carton tare from flat blank area and combined-board grammage.
Whatnot Shipping Cost Calculator
Estimate current contiguous-U.S. Whatnot shipping through 5 lb and split buyer and seller cost.
BUILT BY LOOK ATLAS
Your product deserves more than a marketplace thumbnail.
Turn a simple product photo into polished, campaign-ready creative for your store, ads, and social channels. No studio. No reshoots.
Create your first shoot free, then keep going when you’re ready.