UD5 Toolkit
Simple Haversine Distance Calculator – Online City‑to‑City
Enter two city names or coordinates and get the straight‑line distance in miles/km. Local calculation.
Portable Generator Sizing – Online Wattage Estimator
Total Running Watts
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watts
Peak Surge Watts
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watts
Min Generator Size
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watts (starting)
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🔧 Related Tools
Fishing Sinker Weight vs. Depth Calculator – Online Drift Speed
Estimate the sinker weight needed to hold bottom in current based on line diameter, depth, and current speed.
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.
Toilet Paper Stock Calculator – Online How Long Will It Last?
Enter rolls remaining and household size to estimate weeks of supply. A humorous yet practical aid.
Popcorn Yield Calculator – Online Kernels to Popped Volume
Enter amount of kernels and see estimated popped volume. Plan movie night snacks perfectly.
Speaker Placement Calculator - Online Home Theater Stereo Angle
Calculate ideal stereo speaker placement (toe-in, distance from wall) for best soundstage. Visual diagram. For audiophiles. Local tool.
TV Viewing Distance Calculator - Online Size vs Resolution Guide
Find the optimal TV size for your room or the best viewing distance based on screen size and resolution (1080p, 4K, 8K). Simple THX/SMPTE reference.
Blood Alcohol Content Estimator - Online BAC Calculator
Estimate BAC based on gender, weight, drinks consumed, and time. Uses Widmark formula. Educational tool, never encourage drunk driving. Local only.
Default Wi‑Fi Password Calculator - Online ISP Router Keygen
Enter a router's MAC address or serial and generate the common default WPA passphrase for major ISP brands. Educational purpose only.
Week Number & Start/End Dates - Online ISO 8601
Enter any date and get its ISO week number, plus the start and end dates of that week. Quick reference.
Shadcn/UI Theme Builder - Online Custom CSS Variables
Pick colors for the shadcn/ui design system and generate the complete CSS variable theme file. Copy into your project.
Relative Luminance Calculator - Online WCAG Metrics
Enter a hex color and get its relative luminance per WCAG definition. Understand why this matters for contrast.
Random Medieval Profession - Online RPG Background
Generate a random medieval occupation with a short description. For NPCs or historical curiosity. Local list.
Fancy Title Generator - Online Royal & Noble Names
Generate a grand, aristocratic title like 'Duke of Waffleshire'. Perfect for silly fun or RPG characters. Local.
CSS Glow Hover Effect - Online Animated Box Shadow
Design a button or card that glows on hover. Adjust shadow color, spread, and transition. Copy the CSS. Rich UI.
CSS Checkerboard Pattern - Online Background Generator
Create a customizable checkerboard or grid background using pure CSS gradients. Adjust cell size and colors. Copy the code.
Workday Calculator with Holidays - Online Add Business Days
Add N business days to a date, skipping weekends and optionally entering custom holidays. Regional presets.
CSS Progress Bar Generator - Online Animated & Styled
Create a custom HTML/CSS progress bar with percentage, colors, and animation. Copy the code. Modern UI element.
Random Song Lyric Generator - Online Fake Music Line Creator
Generate a random, somewhat meaningful song lyric line. Write your own hit with AI‑free randomness. All local.
Exoplanet Name Generator - Online Alien World Catalog
Generate a realistic‑sounding exoplanet designation (e.g., Kepler‑442b) and a sci‑fi planet description. For worldbuilding.
Bubble Tea Recipe Calculator - Online DIY Boba Proportions
Choose your cup size and sweetness level, and get exact proportions for tea, milk, syrup, and tapioca pearls. Perfect homemade boba every time.
Battery Series/Parallel Calculator - Online Voltage & Capacity
Combine multiple identical batteries in series and parallel and see the resulting voltage and total capacity. Electronics helper.
Bayes' Theorem Calculator - Online Probability Update Tool
Easily compute posterior probabilities given prior, likelihood, and marginal likelihood. Visual diagram. All local.
Megapixel Calculator - Online Print Size & Resolution
Find out how large you can print based on image resolution in pixels. Understand DPI and megapixels.
F‑Stop Calculator - Online Aperture & Depth of Field Reference
Learn about f‑stops and their effect on light and depth. Calculate equivalent exposure adjustments. Educational.
Day of the Week Calculator - Online Find Weekday from Date
Find what day of the week any past or future date falls on. Uses Zeller’s congruence. Fun historical reference tool.
Magic Square Generator - Online Create n x n Constant Sum Grid
Generate magic squares of odd order (3x3, 5x5, …). See the sum constant and verify rows, columns, diagonals. Educational math toy.
Excuse Generator - Online Funny & Creative Reasons
One click to get a hilarious excuse for being late, missing homework, or not doing chores. Pure comedy.
Tip Pool Calculator - Online Fair Share Splitter for Staff
Fairly distribute pooled tips among staff based on hours worked or points. Customizable percentages. All calculations local and private.
Mortgage Calculator - Online Home Loan & Amortization Tool
Estimate monthly mortgage payments with amortization schedule. Input loan amount, interest rate, and term. All calculations performed securely on your device.