UD5 Toolkit
Duct Tape Sheet Calculator – Online Length for Wallet or Purse
Enter wallet size and get the exact length of duct tape strips needed to build a sheet. DIY crafting.
All Tools
999+ toolsCrochet Hook Size Converter – Online US, UK, Metric, JP
Enter a hook size in any system and instantly see the equivalent in all other standards.
Median Filter Denoiser – Online Remove Salt & Pepper Noise
Apply a simple median filter to remove speckle noise. Adjust kernel size. Fully local canvas processing.
Accessible Chart Palette Builder – Online Data Visualization
Build a color palette for charts that works for protanopia, deuteranopia, and grayscale. Export as array.
Coin Toss Probability Demonstrator – Online Long‑Run Simulator
Virtual flip coins thousands of times and see the heads/tails ratio converge to 50%. Interactive law of large numbers.
Kanji Stroke Count Quiz – Online Guess & Order
A kanji appears; you guess how many strokes it has. Learn stroke order awareness.
Poetry Meter Detector – Online Iambic, Trochaic, etc.
Paste a line of poem and see which syllable stresses create a particular meter. Educational tool.
Drum Shell Fundamental Note Calculator – Online Bearing Edge
Enter drum diameter, depth, and material to find the shell's approximate fundamental note. For tuning reference.
Carnivorous Plant Water Guide – Online PPM & TDS Reference
Learn what water is safe (rain, distilled, low PPM) for pitcher plants and flytraps. Visual PPM scale.
Air Plant Soaking Timer – Online Weekly Tillandsia Care
Set weekly reminders to soak your air plants. Timer and drying instructions included.
Pond Algaecide Dose Calculator – Online Gallons & Product %
Enter pond volume and product concentration to determine safe ml or teaspoon of algaecide.
Wine Chilling Estimator – Online Fridge vs. Ice Bucket Cooling
Enter starting room temp, target temp, and method to see how many minutes to chill your wine perfectly.
Dishwasher Rinse Aid Refill Tracker – Online Cycle Count
Log how many cycles since last refill and get an alert when it's likely empty.
Iron Absorption Optimizer – Online Timing & Food Pairing
Schedule your iron supplement away from inhibitors (coffee, calcium). Visual reminder and log.
Injection Site Rotation Calendar – Online Abdomen, Thigh, Arm
Plan insulin or other injection sites with a visual body map and date log. Prevent lipohypertrophy.
DIY Electrolyte Powder Calculator – Online Sodium Potassium Glucose Ratio
Create your own oral rehydration solution by mixing salt, potassium, and sugar to WHO formula. Convert to teaspoon amounts.
Microwave Wattage Converter – Online Recipe Time Adjuster
Enter the recipe's wattage and your microwave's wattage to convert cooking time. Prevent burnt or cold food.
Caulk & Sealant Selector – Online Bathroom, Kitchen, Exterior
Answer where you're sealing (shower, window, baseboard) to get the right type of caulk (100% silicone, acrylic latex, etc.). Avoid moldy seals.
Emoji Version Checker – Online See Unicode Support per OS
Enter an emoji or browse to see which Unicode version introduced it and whether older OS versions might fail.
CSS Blend Mode Playground – Online background-blend-mode & mix-blend-mode
Load images or use colors and apply all 15 CSS blend modes. Visual tester for creative effects.
Mac Keyboard Shortcut Visualizer – Online Modifier Key Cheatsheet
Press a combination of modifier keys and see which common macOS shortcuts use them. Learn by experimentation.
Pub Trivia Host Toolkit – Online Score & Answer Checker
Enter the correct answer and accept player entries. Highlights correct ones. Simple scorekeeper for home trivia.
Snowboard Stance Width Finder – Online Height & Riding Style
Enter your height and riding style to get a recommended stance width and binding angles. Centered and balanced.
Tennis String Tension Guide – Online Racquet, String & Play Style
Select your racquet head size, string type, and play style to get a recommended tension range. Find your sweet spot.
Golf Club Distance Logger – Online Track Average Carry per Club
Record shot distances for each club and see averages. Identify gaps in your bag. Local storage.
Chess Opening Trainer – Online ECO Code Flashcard Practice
Drill opening names from their ECO codes. See a code and recall the opening. Improve your chess vocabulary.
Cast & Bandage Shower Timer – Online Waterproof Cover Check
Timer to remind you to limit shower water exposure even with a cast cover. Keep your cast dry.
Shoe Wear Pattern Diagnosis – Online Pronation & Gait Guide
Compare your worn sole pattern with reference images to determine pronation type and get shoe recommendations.
Shoelace Length Calculator – Online Eyelet Pairs & Pattern
Enter number of eyelet pairs and lacing style to find the correct shoelace length in inches/cm. Never buy too short.
Trumpet Mouthpiece Comparator – Online Cup, Throat, Backbore
Compare mouthpiece specifications side‑by‑side. See how changes affect tone and range. Educational for brass players.
Coffee Extraction Estimator – Online TDS & Yield from Refractometer
If you have a refractometer reading, enter TDS and brew weight to get extraction yield. Dial in your pour‑over.
Jerky Marinade Ratio Calculator – Online Soy, Worcestershire, Cure
Scale a jerky marinade recipe based on meat weight. Includes optional cure #1 calculation for safety.
Snake Prey Size & Feeding Schedule – Online Weight‑Based Guide
Enter your snake's weight and species to get recommended rodent size and feeding frequency. Avoid under/overfeeding.
Fish Quarantine Countdown – Online New Arrival Observation
Set a date when a new fish arrives and get a daily checklist for observation. Countdown to safe introduction.
Hole Saw Speed & Feed Calculator – Online Diameter & Material
Enter hole saw diameter and material to find the recommended RPM and feed pressure. Prevent burning and kickback.
Spray Paint Distance & Coverage Calculator – Online Even Coat Tool
Enter nozzle type and surface area to get optimal spray distance, sweep speed, and estimated cans needed. Prevent runs and drips.
Candlepin Bowling Score Calculator – Online Small Ball Scoring
Keep score for candlepin bowling with its unique rules. No strike carries automatic strikes. For New England enthusiasts.
Tea Leaf Expansion Calculator – Online Pot Size & Leaf Weight
Enter pot volume and tea type to find the right amount of dry leaf considering expansion. Avoid overflowing.
What Fruit Are You? Fun Personality Quiz – Online Cute Generator
Answer 5 silly questions and get a fruit personality result with a description. Harmless fun, local only.
Hijri to Gregorian Converter – Online Umm al‑Qura Estimate
Convert dates between Hijri and Gregorian using the Umm al‑Qura algorithm. Approximate local moon sighting may vary.
Koi Pond Stocking Calculator – Online Gallons per Fish
Enter pond dimensions and filtration type to estimate safe number of adult koi. Prevent overcrowding.
Erg Stroke Rate & Split Predictor – Online Concept2 Pace Chart
Enter distance and time to get your 500m split. Also predicts how a change in stroke rate affects power output.
Morse Code Speed Tapping Game – Online Decode & Type Race
Morse characters flash on screen; you must tap them correctly on a single button. Points for accuracy and speed. Learn Morse in a fun way.
Old English / Anglo‑Saxon Word Lookup – Online Basic Translator
Type a modern English word and get a possible Old English equivalent. Works offline with a limited but curated wordlist. Learn history.
Recorder Fingering Chart – Online Baroque & German System
Interactive soprano recorder chart showing which holes to cover for each note. Switch between baroque and German fingering.
Soda Ash Soak Calculator – Online Tie‑Dye Prep Ratio
Calculate water and soda ash needed to pre‑soak fabric for tie‑dye. Achieve vibrant, long‑lasting colors.
Candle Wick Testing Log – Online Record & Compare Burn Results
Log pool depth, flame height, and soot for each wick series. Quickly identify the best wick for your wax and vessel.
Opened Paint Freshness Checker – Online Smell & Consistency Guide
Enter the approximate age of opened paint and answer visual/olfactory questions to see if it's still usable. Reduce waste.
Cutoff Wheel Life Logger – Online Tracks Cuts & Diameter
Log initial wheel diameter and after some cuts to see wear rate and estimate remaining life. Made for metalworking and hobbyists.
Safe Room Size Calculator – Online Occupancy & Ventilation Check
Enter number of people and desired duration to estimate the minimum square footage and ventilation CFM for a residential storm shelter.
Solar Light Sun Exposure Plotter – Online Daily Direct Sun Check
Select your latitude and day of year to see sun path and identify spots with the most direct sunlight for solar garden lights. Simple visual tool.
Chicken Feed Ration Calculator – Online Layer, Broiler, Chick
Mix your own feed by entering grain percentages and see the resulting crude protein. Formulate a balanced diet for your flock.
Wine Must Adjuster – Online Sugar, Acid & Tannin Calculator
Enter your must volume and current Brix, TA, and pH to calculate additions of sugar, acid blend, or tannin. Standard winemaking formulas.
Soap Superfat & Lye Purity Adjuster – Online Cold Process Calc
Adjust your lye amount based on lye purity (KOH/NaOH) and desired superfat percentage. Provides safety check for handmade soap recipes.
Time‑Lapse Interval Calculator – Online Shoot Duration & Playback Length
Plan your time‑lapse by entering desired clip length, fps, and event duration to find the shooting interval and total frames needed. Avoid under‑ or over‑shooting.
Citrus Juice & Zest Converter – Online Lemon/Lime/Orange
Convert between whole fruit, juice volume, and zest quantity. Never wonder how many lemons for 1/4 cup.
Bolt Torque to Tension Estimator – Online Simple Calculator
Enter bolt diameter and applied torque to estimate clamping force. Use standard friction factors.
Resin Casting Volume Calculator – Online Mold & Part A/B
Enter mold dimensions or water weight to get total resin needed, including Part A and B.
Saponification Value Lookup – Online Oils & Butters
Search for the NaOH and KOH sap values of various oils. Reference for cold process soap makers.
Tap to Morse Code Keyboard – Online Touch & Decode
Tap short/long on the screen to create Morse characters, and see the decoded text appear.