UD5 Toolkit
Postal Volumetric Weight Calculator – DIM Factor for Shipping
Calculate the chargeable weight of a package for courier services like UPS, FedEx, and DHL. Enter dimensions and actual weight to see volumetric weight and shipping cost estimate.
Shipping Box Size Optimizer - Online Fit Items into Carton
Carton Dimensions (inner)
cm
cm
cm
Items to Pack
Max 30 items; allowed rotation: all 6 orientations.
Frequently Asked Questions
It calculates the optimal placement of rectangular items into a shipping carton, considering all possible rotations, to maximize space utilization and minimize unused volume. You input carton inner dimensions and item dimensions, and it provides a visual packing plan and utilization metrics.
We use a heuristic (greedy with maximal spaces) that produces high-quality results for most practical cases. It is not guaranteed to find the perfect global optimum, but it outperforms simple volume-comparison tools and works reliably for up to 30 items.
Yes, the optimizer automatically considers all 90-degree rotations (length, width, height permutations) for each item to find the best fit.
Utilization % = (total volume of placed items / carton inner volume) × 100. It reflects how efficiently the carton volume is used.
Currently this tool handles only rectangular boxes. Weight distribution and irregular shapes are not supported.
3D Packing Visualization
Drag to rotate (placeholder)
Enter carton and items, then click Optimize Packing.
Crochet Hook Size Converter – Online US, UK, Metric, JP
Enter a hook size in any system and instantly see the equivalent in all other standards.
Isometric Box CSS Generator – Online 3D Cube Builder
Set width, height, depth, and colors to generate an isometric box using CSS transforms. Copy to your project.
Worm Bin Sizing Calculator – Online Square Feet per Person
Estimate the worm bin surface area needed based on the amount of kitchen scraps your household produces weekly. Right‑size your worm farm.
Pop Rivet Size Selector – Online Sheet Thickness Guide
Enter material thickness and get the recommended pop rivet diameter and grip range.
Skateboard Deck Size Selector – Online Shoe Size & Style
Select shoe size and riding style to get recommended deck width. Visual comparison.
Bird Harness Size Guide – Online Measurement & Fit
Enter your bird species and weight to find the correct harness size. Visual adjustment guide.
Envelope Size Finder – Online Match Paper & Card
Enter the dimensions of your insert and get the correct envelope size (DL, C6, etc.). Quick mail guide.
Windshield Wiper Size Finder – Online by Vehicle
Look up front and rear wiper blade sizes by car model. Never buy the wrong length again.
Crochet Hat Sizing Guide – Online Measure & Increase
Enter head circumference to get crown diameter and length. Perfect fit top‑down hats.
Jigsaw Puzzle Size Calculator – Online Table Size for Pieces
Enter piece count and piece size to estimate finished dimensions. Check if it fits your table.
Blanket Size Chart – Online Crib, Throw, King Dimensions
Reference for standard blanket and afghan sizes in inches and cm. Perfect for knitters and crocheters.
Backpack Weight Planner – Online Distribute Load & Reduce kg
List each item with weight, see total load. Color-coded recommendations for reducing pack weight. Local storage.
Moving Box Calculator - Online Estimate How Many Boxes You Need
Enter number of rooms and get an estimate of how many moving boxes in each size you'll need. Plan your move efficiently. Local tool.
Luggage Size Checker - Online Airline Carry-On Compliance Tool
Enter your bag dimensions and compare against major airline carry-on and checked limits. Visual pass/fail gauge. Avoid gate fees.
Running Shoe Size Converter - Online US UK EU CM Chart
Convert running shoe sizes between US (men/women), UK, EU, and centimeters. Also includes brand-specific fit notes (general guide).
Diaper Size Finder - Online Weight-Based Size Guide
Enter baby's weight in lbs or kg to see suggested diaper sizes across major brands. General reference, no data collected.
Sewing Pattern Layout Optimizer - Online Minimize Waste
Place rectangular pattern pieces on a virtual fabric width to optimize cutting layout and reduce waste. Simple manual drag & drop. Local only.
Paper Size Converter - Online A4, Letter, Legal Dimensions
See exact mm and inch dimensions of ISO A-series and US paper sizes. Visual comparison tool. Also calculates weight based on GSM and dimensions.
PDF Compressor - Online Reduce File Size Locally
Shrink a PDF file size with configurable image quality and object removal. All processing stays in your browser.
Viewport & Document Size Viewer - Online Real‑Time
See the current viewport width/height, document size, scrollbar width, and pixel ratio. Essential responsive data.
Element Resize Detector - Online Monitor Size Changes
Select any element on the test page and monitor its size changes with ResizeObserver. See log of all entries.
Resize Observer Playground - Online Watch Element Size
Drag to resize a box and see the Resize Observer callback fire. Get contentRect and borderBoxSize. Learn the API.
Inline SVG Optimizer - Online Clean & Minify Embedded SVGs
Take a bloated inline SVG and clean it: remove unnecessary attributes, apply CSS shorthand. Smaller markup. Pure parser.
Screen Reader Text Optimizer - Online Improve Alt & Link Text
Analyze text for screen reader friendliness: detect vague link text, missing alt suggestions. Get a report. Local.
SVG Optimizer - Online Minify & Clean Vector File
Strip metadata, comments, and unnecessary precision from SVG files. Reduce file size. Pure browser SVG parser.
CSS Aspect Ratio Box Generator - Online Intrinsic Size
Create a responsive box that maintains a specific aspect ratio using the aspect‑ratio property. Copy the simple CSS.
DOM Size Inspector - Online Count & Warn for Performance
Count total DOM nodes on the current page and show warnings if limits exceed best practices. Keep the DOM lean.
Web Image Size Calculator - Online KB & Dimensions Tool
Predict the file size of an image based on pixel dimensions and format (JPEG, PNG, WebP). Rough estimate. Local.
Tire Size Visualizer - Online Compare & Dimensions
Enter two tire sizes and see a side‑by‑side comparison of diameter, width, and speedometer error. Local math.