UD5 Toolkit
Water Hardness Converter – Grains, ppm, mg/L & dH
Convert water hardness readings between grains per gallon, parts per million, milligrams per liter, and German degrees. Perfect for aquarium keepers and espresso lovers.
Converters - Format & Unit Conversion
99+ toolsMarkdown to Plain Text Converter – Strip Formatting
Paste Markdown and receive clean, readable plain text with formatting removed. Useful for repurposing blog content for email or plain‑text editors.
JSON to CSV Table – Flatten Nested Objects Online
Convert a JSON array into a CSV table that you can view, sort, and download. Automatically flattens simple nested objects into dot‑notation columns.
ASCII Text to SVG Converter – Monospaced Diagram Art
Paste ASCII art or text‑based diagrams and convert them into a crisp SVG image. Preserves spacing and can be styled with CSS for documentation.
Rabbit Age to Human Years Converter – Bunny Life Stage
Find out how old your rabbit is in human years. Understand the difference between a 6-month-old bunny and a senior rabbit in terms of human life stage.
Parrot Age to Human Years Converter – Budgie, Cockatiel & Macaw
Convert your parrot's age into equivalent human years based on species-specific lifespan data. Covers budgies, cockatiels, African greys, macaws, and more.
EU to US Clothing Size Converter – Dresses, Shirts & Pants
Convert European clothing sizes to US equivalents. Includes women's dresses, men's shirts, pants waist, and general tops with measurement guidance.
UK to US Shoe Size Converter – Men, Women & Kids
Easily convert UK shoe sizes to US sizes (and vice versa) for men, women, and children. Avoid ordering the wrong size when shopping internationally.
Frequency to Wavelength Converter – c = λf Calculator
Convert between frequency and wavelength for electromagnetic and sound waves. Use the speed of light or custom wave speed to get precise results instantly.
Tablespoons to ml Converter – Cooking Measurement Quick Tool
Convert tablespoons to milliliters and other common cooking volume units. Also covers teaspoons, cups, fluid ounces, and milliliters for precise liquid measuring.
Cups to Grams Converter – Baking Ingredients Weight
Convert US cups to grams for common baking ingredients including flour, sugar, butter, and more. Get accurate measurements for consistent baking results.
Fahrenheit to Celsius Quick Converter – Oven Temps & Weather
Convert Fahrenheit to Celsius (and vice versa) with a clean, fast interface. Includes common oven temperatures and weather reference points for everyday use.
MPH to KPH Converter – Speed Conversion for Travel
Instantly convert miles per hour to kilometers per hour. Handy for driving abroad, understanding international speed limits, or comparing vehicle performance.
Running Pace Converter – min/mile to min/km
Convert your running pace between minutes per mile and minutes per kilometer. Also see equivalent finish times for 5K, 10K, half marathon, and marathon distances.
kg to lbs & Stone Converter – Weight Conversion Online
Convert kilograms to pounds and stones accurately. Also works for lbs to kg and stone to kg. Perfect for tracking weight loss or cooking with international recipes.
cm to Feet & Inches Converter – Height & Length Quick Tool
Quickly convert centimeters to feet and inches, and vice versa. Essential for international height comparison, furniture dimensions, and understanding metric vs imperial.
Microwave Wattage Converter – Adjust Cooking Time
Your microwave wattage differs from the recipe? Use this tool to adjust the cooking time accurately. Avoid undercooked or overcooked meals by matching the correct wattage.
Instant Pot Time Converter – Stovetop & Slow Cooker to Pressure
Convert recipe cooking times from stovetop, oven, or slow cooker to Instant Pot pressure cooking times. Also includes liquid adjustment tips for best results.
Air Fryer Conversion Calculator – Oven to Air Fryer Time & Temp
Quickly convert conventional oven recipes for your air fryer. Adjust temperature and cooking time so your food comes out crispy and perfectly cooked every time.
Baking Pan Size Converter – Round to Square & Volume
Adapt any recipe to the pan you own. Convert between round, square, and rectangular pans by volume, and see how to adjust baking time and temperature.
Seam Allowance Converter – Imperial & Metric Quick Reference
Convert common seam allowances between inches and centimeters. See visual guides for 1/4″, 3/8″, 1/2″, 5/8″, and more, to avoid cutting errors in your sewing projects.
Knitting Needle Size Converter – US, UK, Metric & Japan
Instantly convert knitting needle sizes between US, UK, metric (mm), and Japanese systems. Never be confused by international patterns again.
Cat Age to Human Years Converter – Updated Formula
Convert your cat's age into equivalent human years using the latest veterinary guidelines. Understand the difference between a 1-year-old and a 15-year-old feline.
Ordinal Date Converter – Day of Year to Calendar Date
Convert an ordinal date (day 1–365/366) to a standard calendar date and vice versa. Useful for agriculture, project planning, and understanding day-of-year notations.
APY to APR Converter – Calculate Effective Annual Rate Online
Quickly convert between Annual Percentage Yield (APY) and Annual Percentage Rate (APR) with compounding frequency. Understand the true cost of loans or real return on savings in a simple online tool.
Thread Weight Converter – Online Tex, Denier, Wt, Nm
Convert between thread weight systems: Tex, denier, Nm, and cotton count. Accurate sewing.
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.
Frequency Ratio to Cents Converter – Online Microtonal Tool
Convert a frequency ratio (e.g., 3/2) to cents and vice versa. Explore just intonation and microtones.
Historical Pitch Converter – Online A415, A430, A440, A465
Transpose a note between modern concert pitch and common historical pitches. Early music helper.
Sax/Clarinet Reed Strength Converter – Online Vandoren to Rico etc.
Convert reed strength between different brands (Vandoren, Rico, D'Addario). Cross‑reference chart.
Herb Drying Method Converter – Online Dehydrator ↔ Oven ↔ Air
If a recipe calls for a dehydrator, convert the time and temperature to a low‑oven method.
Charcoal BTUs vs Gas – Online Grill Conversion Guide
How many charcoal briquets equal a gas burner's BTUs? Enter target heat to see approximate briquet count.
Baking Pan Size Converter – Online Round, Square, Rectangle Volume
Enter an original pan size and find an alternative pan with the same batter volume. Never overflow or underfill.
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.
Number to Ordinal (1st, 2nd, 3rd) – Online Multi‑Language
Enter a number and see its ordinal representation in English, Spanish, French, etc. Localized rules.
Ring Size Converter – Online Circumference/Diameter to US, UK, EU
Measure a ring's inside diameter or circumference and convert to US, UK, European, and Japanese sizes.
International Bra Size Converter – Online US, UK, EU, FR, AUS
Convert band and cup sizes between US, UK, European, French, and Australian systems. Accurate shopping abroad.
Slow Cooker Time Converter – Online High to Low & Stovetop
Convert a recipe from oven or stovetop to slow cooker (high/low) and vice versa. Perfect doneness.
Stove BTU to Temperature Estimator – Online Gas Mark Conversion
Convert between BTU, gas marks, and approximate Fahrenheit temperatures. Understand your burner output.
Cooking Unit Fool‑Proof Converter – Online Easy Scale & Unit Swap
Select ingredient and convert between grams, cups, ounces, etc. with built‑in density estimates. Also scale recipe.
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.
Climbing Grade Converter – Online V‑Scale to Font & YDS
Convert climbing difficulty between V‑scale, Fontainebleau, and Yosemite Decimal System. Quick reference for gym climbers.
Dvorak Layout Text Converter – Online See Typed Words in QWERTY
Type on your QWERTY keyboard and see the text as if you were on a Dvorak layout. Helps learn Dvorak without switching.
Yarn Weight Converter – Online Wrap Per Inch & Gauge Tester
Use wrap‑per‑inch (WPI) to identify mystery yarn and see equivalent standard weights (fingering, worsted). Compensate gauge.
Air Fryer Conversion Calculator – Online Oven to Air Fryer
Convert oven recipe temperature and time to air fryer settings. Quick reference.
Instant Pot Time Converter – Online Stove to Pressure
Convert traditional cooking time to electric pressure cooker time. Reference chart.
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.
Leather Thickness Conversion – Online oz to mm Chart
Convert between ounces and millimeters for leather. Visual guide to common project thicknesses.
Video Still Frame to GIF – Online Snap & Animate
Extract a few seconds from a video and convert to a short looping GIF. Use browser video decoder.
Number to English Words (Decimal) – Online Check Writer
Convert a number like 1234.56 to English words 'one thousand two hundred thirty-four and 56/100'. For checks.
Advanced Case Converter – Online snake_case camelCase kebab-case
Convert text between various programming case styles. Includes SCREAMING_SNAKE, PascalCase, etc.
Salary to Hourly Rate Converter – Online with Vacation Factor
Convert annual salary to effective hourly rate considering holidays, vacation, and work hours per week.
JSON to PlantUML Diagram – Online Visualize Data Structure
Paste a JSON object and generate PlantUML code for a class or object diagram. Preview rendered image.
Markdown to Word Snippet – Online Copy Formatted Text
Render Markdown and copy the formatted output as rich text to paste directly into Word or Google Docs.
UwU / OwO Text Converter – Online Furry Speak Generator
Transform normal sentences into cutesy UwU speak. Customizable intensity. Internet fun.
Aircraft Tail Number to Phonetic Callsign – Online Convert
Enter a registration (e.g., N123AB) and convert to the standard phonetic callsign. Aviation enthusiast tool.
Nautical Mile & Knot Converter – Online Marine Units Tool
Convert between nautical miles, statute miles, kilometers, and knots to mph/kmh. Essential for navigation.
CSS Color Converter All-in-One: Hex, RGB, HSL, OKLCH
Enter color in any CSS format and see all other representations. Live preview. Swatch history.
Text to Unicode HTML Entities – Online Convert All Chars
Type text and get every character converted to &#xxxx; entities. Useful for encoding.
Embroidery Thread Converter - Online DMC to Anchor to Madeira
Find equivalent colors across DMC, Anchor, and Madeira embroidery floss brands. Enter a code to see matches. Local reference database.