Free Online Calculators & Tools Collection
💼 Financial Calculators
💵 Minimum Wage Calculator (South Korea)
Calculate daily, weekly, monthly pay from South Korea's 2026 minimum wage
🔄 Wage Converter (South Korea)
Convert between hourly, daily, weekly, monthly wages for South Korea
💵 Loan Interest Calculator (South Korea)
Detailed calculation of monthly payments and total interest (South Korea finance)
🏠 Acquisition Tax Calculator (South Korea)
Calculate real estate acquisition tax based on South Korean tax law
📅 Annual Leave Calculator (South Korea)
Calculate vacation days based on South Korean labor standards
📈 Compound Interest Calculator
Calculate compound returns and investment growth
💰 Salary Calculator (South Korea)
Calculate take-home pay for South Korea (4대보험, tax deductions)
📊 2026 Salary Table (South Korea)
View take-home pay for salaries from 20M to 300M KRW in South Korea
💪 Health Calculators
⚖️ BMI Calculator
Calculate body mass index from height and weight
🍎 Calorie Calculator
Calculate daily calorie intake recommendations
💧 Water Intake Calculator
Calculate daily water intake based on weight and activity
🥗 Macro Calculator
Calculate protein/carb/fat ratios by diet style
🏃 Exercise Calorie Calculator
Calculate calorie burn by exercise type
😴 Sleep Cycle Calculator
Optimal wake/sleep times based on 90min cycles
🔊 Noise Decibel Meter
Measure real-time noise levels in dB
🤰 Due Date Calculator
Calculate pregnancy week and due date
📅 Date & Time Calculators
🌙 Lunar Calendar
Convert between solar and lunar calendar dates
📆 Date Calculator
Calculate date intervals and specific dates
⏰ Time Calculator
Add and subtract time
📍 D-Day Calculator
Count days until target dates
🎂 Age Calculator
Calculate age from date of birth
📅 Day of Week Calculator
What day was it? Find day of week for any date
🛍️ Black Friday
Check days until Black Friday sale
🔢 General Calculators
📊 Percentage Calculator
Calculate percentages, increases, and decreases
💳 Tip Calculator
Calculate tips and split bills easily
🍽️ Dutch Pay Calculator
Split bills evenly
🎰 Lotto Generator
Generate random lottery numbers
🍳 Recipe Converter
Automatically scale ingredient quantities by serving size
📊 Statistics Calculator
Calculate mean, variance, standard deviation, median, mode
📏 Unit Converter
Convert length, weight, temperature, volume, speed and more
📐 Pyeong Converter
Convert between pyeong (坪) and square meters (㎡)
➗ Fraction Calculator
Add, subtract, multiply, divide fractions
🔬 Scientific Calculator
Trigonometry, logarithms, exponents
📐 Aspect Ratio Calculator
Calculate and convert image/video ratios
📏 Pixels to Inches
Convert between pixels and inches by DPI
🎮 Games/Tests
⌨️ Typing Test
Measure typing speed (WPM) and accuracy
⚡ Reaction Test
Measure click reaction time in milliseconds
🧠 Memory Test
Number/pattern memory brain training
🎯 Random Picker
Spin the wheel to pick winners
⚡ Internet Speed Test
Measure ping, download, and upload speed
🔋 Battery Information
Check battery status and charging info
⌨️ Keyboard Tester
Test keyboard input and shortcuts
🎮 Gamepad Tester
Test controller buttons and sticks
🖱️ Click Speed Test
Measure CPS (clicks per second)
📊 Polling Rate Tester
Measure mouse polling rate (Hz)
🎲 Dice Roller
Roll D4, D6, D8, D12, D20 dice
🃏 Card Deck Shuffle
52-card poker deck shuffling simulator
🎰 Random Number Generator
Generate random numbers in custom range
📍 Seat Assignment
Auto-assign seats by entering names
🎯 Bingo Generator
Auto-generate 5x5 bingo boards with caller
🕐 Clock Tools
⏰ Pomodoro Timer
25min focus + 5min break for productivity
⏱️ Stopwatch & Timer
Accurate time measurement and timer functions
🌍 World Clock
Check current time in major cities worldwide
🌏 Time Difference Calculator
Calculate time differences between cities
🎵 Metronome
Online metronome with adjustable BPM
🥁 BPM Counter
Tap to measure music BPM
🎹 Note Frequency Calculator
Musical note Hz frequency chart
🎯 Focus Timer
Flexible timer for deep work (90min focus, 50min study, 25min creative)
💻 Developer Tools
🔐 Base64 & URL Encoder/Decoder
Base64 and URL encoding/decoding tool
🔍 Regex Tester
Test regular expression patterns and view match results
🔗 URL Parser Tool
Extract domain, path, query, and UTM parameters from URLs
🕒 Time Format Converter
Convert between 12/24h, Unix Timestamp, ISO 8601 formats
🔄 CSV JSON Converter
Easily convert between CSV and JSON formats
📄 JSON Formatter
Format, minify, validate, and sort JSON
🔑 UUID Generator
Generate and validate UUID v4/v1 identifiers
🔤 Unicode Converter
Convert between text and Unicode/HTML entities
🔐 Hash Generator
Generate MD5, SHA256 and other hashes
🖥️ Browser/Device Info
User-Agent parsing, screen resolution, browser info
🔑 JWT Decoder
Decode and verify JWT tokens
🔣 Image to Base64
Encode images to Base64 strings
📝 Lorem Ipsum Generator
Generate dummy text (paragraphs/sentences/words)
⏰ Cron Expression Generator
Generate crontab schedule expressions
🗃️ SQL Formatter
Format and beautify SQL queries
🎯 Regex Cheatsheet
Common regular expression patterns collection
🎨 Tailwind CSS Color Generator
Auto-generate Tailwind color palettes
📐 CSS Flexbox Generator
Visual Flexbox code generator
🌈 CSS Animation Generator
Create keyframe animations
📱 Responsive Viewport Simulator
Test on various screen sizes
📝 Text Tools
📝 Text Analyzer
Real-time character, word, paragraph, and sentence counter
🔤 Text Formatter
Convert case, sort, remove duplicates, replace characters
📋 Text Diff Tool
Compare two texts and highlight added/deleted changes
✨ Text Decorator
Transform text with special character styles
📝 Markdown Preview
Markdown to HTML conversion preview
📊 Excel Viewer
View Excel files directly in browser
🔢 Number to Words Converter
Read numbers in Korean/English (check writing, amounts)
📝 Page Count Converter
Convert character count to A4 pages (10pt, 11pt, report)
🔐 Security Tools
📱 QR/Barcode
🔄 Converter Tools
🎲 Generators
🎮 Nickname Generator
Generate fun nicknames for games and social media
💕 Name Compatibility Test
Check compatibility score by names
🐉 Zodiac Compatibility
Fun compatibility test based on Korean 12-tti zodiac
🎨 Gradient Generator
Visually create CSS gradients and copy code
🌑 Shadow Generator
Visual CSS box-shadow/text-shadow creator
⭕ Border Radius Generator
Visual CSS border-radius adjuster
📄 PDF Tools
🖼️ Image Tools
📐 Image Resizer
Easily resize photos by pixels or percentage
🗜️ Image Compressor
Reduce image file size for web optimization
🔄 Image Format Converter
Convert between JPG, PNG, WebP, GIF formats
🎨 Image Filter
Apply grayscale, sepia, brightness, contrast and more
🔄 Image Rotate/Flip
Rotate images 90°, 180°, 270° or flip horizontally/vertically
💧 Add Watermark
Add text watermarks to protect your images
✂️ Background Remover
Remove image background to make it transparent
📷 EXIF Viewer/Remover
View photo metadata and remove for privacy
🎬 GIF Maker
Create animated GIF from multiple images
🎨 Icon Generator
Convert images to various favicon/app icon sizes
🔲 Mosaic/Blur
Apply mosaic or blur effect to image areas
✂️ Image Crop
Crop images to desired size and ratio
🔗 Image Merge
Combine multiple images horizontally or vertically
📸 Screenshot Beautifier
Add beautiful backgrounds and frames to screenshots
🖍️ Coloring Page Converter
Convert photos to coloring pages by extracting outlines
🎨 Canvas Drawing
Online drawing tool - brushes, shapes, and text
⏩ GIF Speed Controller
Adjust GIF animation playback speed
✍️ Handwriting Converter
Convert text to handwritten style images
Health-related calculators are for informational purposes only and do not constitute medical advice. Always consult a qualified healthcare professional.