Shipping Box Size Optimizer - Online Fit Items into Carton
Enter item dimensions and find the smallest rectangular box that can fit them (simple packing heuristic). Helps reduce shipping costs. Local algorithm.
UD5 Toolkit
Plan, distribute, and lighten your load for a more comfortable trek
Enter item dimensions and find the smallest rectangular box that can fit them (simple packing heuristic). Helps reduce shipping costs. Local algorithm.
Plot weekly weight gain against recommended ranges based on pre-pregnancy BMI. IOM guidelines displayed. Data stored in localStorage.
Enter baby's weight in lbs or kg to see suggested diaper sizes across major brands. General reference, no data collected.
Find your healthy weight range using multiple medical formulas (Hamwi, Devine, Robinson, Miller). Frame size adjustment included. Instant local computation.
Enter your snake's weight and species to get recommended rodent size and feeding frequency. Avoid under/overfeeding.
Add appliances with running and starting watts to estimate needed generator capacity. Prevent overload.
Look at a color‑coded BMI table for your height and see the healthy weight range. Simple reference.
Enter gestational week to see baby's approximate size compared to a fruit/veg. Visual fun.
Estimate body fat percentage using neck, waist, hip (if female) measurements. Supports US Navy, Covert Bailey, and 3-site skinfold methods. No data sent to server.
Knit a swatch, measure before and after felting, and let this tool calculate the shrink percentage. Plan your felted projects accurately.
Estimate filament usage: enter weight or length and get the remaining value plus cost. PLA/ABS density reference. Local calculation.
Estimate your one‑rep max (1RM) from weight and reps. Supports multiple formulas (Epley, Brzycki). Training percentages table.
Enter head circumference to get crown diameter and length. Perfect fit top‑down hats.
Calculate your one-rep max using Epley, Brzycki, Lombardi or O'Conner formulas. Predict maximum lifting capacity and plan progressive overload. 100% local processing.
Interactive guide to understanding standard 16/24 inch stud spacing. Visualize wall internals. Useful before drilling.
Paste a raster image and an SVG, see the file size and rendering time. Understand when to use vector. Local.
Enter length, width, thickness to approximate surfboard volume. Compare to your ideal volume based on weight.
Enter current ball size and target to find approx rubber bands required. Fun and satisfying.
Estimate your one‑rep max from weight and reps. Supports Epley, Brzycki, Lombardi formulas. See your strength level.
Toggle print‑specific styles like removing backgrounds, showing link URLs, and adding page breaks. Generate a complete print stylesheet instantly.
Enter two tire sizes and see a side‑by‑side comparison of diameter, width, and speedometer error. Local math.
Generate a Lit Element web component skeleton with styles and properties. Copy and start coding immediately.
Calculate the appropriate hide box dimensions based on your reptile’s length and girth. A snug hide reduces stress and promotes natural behavior.
Enter viewing distance to get the minimum readable print font size. Design posters and signs.
Apply will‑change to any element and see its effect on compositing. Learn best practices for smooth animations.
Estimate board feet of spray foam needed for a cavity. Compare closed‑cell and open‑cell.
Drag to resize a box and see the Resize Observer callback fire. Get contentRect and borderBoxSize. Learn the API.
Enter your hammock length to get the ideal fixed ridgeline length (83% of hammock length). Achieve a consistent, comfortable sag.
Add print styles like removing backgrounds, adding page breaks, setting margins. See print preview instantly.
Select any element on the test page and monitor its size changes with ResizeObserver. See log of all entries.