Free Online Calculators & Tools Collection

🔍

🆕 New Features

11

Recently added new tools

🧩 Sudoku

Classic Sudoku puzzle - unlimited generation by difficulty

🔢 Permutation & Combination

Calculate nPr, nCr with step-by-step solutions

😀 Emoji Search & Copy

Search emojis & copy with one click

🔢 2048 Game

Slide number tiles to merge and reach 2048

🏁 Maze Game

Generate random mazes & solve them

🔗 GCD & LCM Calculator

Auto-calculate GCD/LCM with Euclidean algorithm

📊 Matrix Calculator

Matrix addition, multiplication, inverse & determinant

📐 Equation Solver

Solve linear & quadratic equations automatically

🔍 Prime Number Checker

Check primality, find Nth prime, factorize

📏 Shape Area/Volume Calculator

Circle, triangle, sphere, cylinder & more

🧮 Arithmetic Quiz

Solve math problems within time limit

💰 Salary & Employment

15

Severance, insurance, unemployment, weekly allowance & salary calculators

💰 Severance Pay Calculator (South Korea)

Calculate severance pay based on Korean labor law

🏥 4 Social Insurances (South Korea)

Calculate Korean National Pension, Health, Employment & Industrial Insurance

💵 Unemployment Benefits (South Korea)

Estimate Korean unemployment benefit amount and duration

💸 Weekly Holiday Allowance (South Korea)

Calculate Korean weekly holiday pay for part-time workers

👶 Parental Leave Pay (South Korea)

Estimate Korean parental leave benefit payments

💵 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

📅 Annual Leave Calculator (South Korea)

Calculate vacation days based on South Korean labor standards

💰 Salary Calculator (South Korea)

Calculate take-home pay for South Korea (social insurance, tax deductions)

📊 2026 Salary Table (South Korea)

View take-home pay for salaries from 20M to 300M KRW in South Korea

💰 Salary Per Second

Real-time counter showing your earnings per second

🏦 Retirement Pension DC vs DB (South Korea)

Compare Korean DC and DB pension plans

💼 Freelancer 3.3% Tax Calculator

Calculate net income after 3% income tax + 0.3% local tax withholding

⏰ Work Hours Timesheet

Track daily work hours with weekly/monthly auto summation

🔌 EV Charging Cost Calculator

Calculate charging costs by battery capacity, compare provider rates

🏦 Loans & Savings

10

Loan interest, installment, deposit, revolving & refinancing calculators

💵 Loan Interest Calculator (South Korea)

Detailed calculation of monthly payments and total interest (South Korea finance)

📋 Loan Amortization Schedule

Monthly/yearly repayment breakdown with interest comparison

🚗 Car Installment Calculator (South Korea)

Calculate monthly car payments and interest in KRW

💳 Card Installment vs Lump Sum

Compare installment fees, interest-free benefits, and lump sum discounts

📈 Compound Interest Calculator

Calculate compound returns and investment growth

🏦 Savings Interest Calculator

Calculate savings & deposit interest, tax, and net amount

💰 Deposit/Savings Interest Calculator

Calculate after-tax interest for time deposits and installment savings

📉 Early Termination Penalty Calculator

Calculate losses from early termination of deposits, savings, and insurance

💳 Card Revolving Interest Calculator

Simulate credit card revolving interest and total cost analysis

🔄 Loan Refinancing Calculator

Calculate net profit, prepayment fees, and break-even for loan refinancing

🏠 Real Estate & Tax

6

Acquisition tax, capital gains, jeonse vs wolse, inheritance & housing

🏠 Acquisition Tax Calculator (South Korea)

Calculate real estate acquisition tax based on South Korean tax law

🏠 Capital Gains Tax Calculator

Calculate Korean property/stock transfer tax with deductions

💰 Inheritance & Gift Tax (South Korea)

Calculate Korean inheritance and gift tax with deductions

🏠 Jeonse vs Wolse (South Korea)

Compare Korea's unique Jeonse deposit vs monthly rent

🏢 Real Estate ROI (South Korea)

Analyze Korean property rental yield, capital gains & leverage

🏠 Housing Subscription Points (South Korea)

Calculate Korean housing subscription score and competitiveness

🚗 Automobile

4

Car costs, insurance, EV comparison & depreciation calculators

🚗 Car Lease/Buy/Rent Compare (South Korea)

Compare total cost of buying, leasing, or renting a car in Korea

🚗 Car Insurance Estimate (South Korea)

Estimate Korean car insurance premiums by vehicle and driver

⚡ EV vs Gas Cost Comparison

Compare EV and gasoline car fuel, maintenance, and total costs

🚗 Car Depreciation Calculator

Calculate current value and depreciation by vehicle type & year

⚡ Utility & Living

6

Electricity, water/gas, wedding budget, travel & subscription calculators

⚡ Electricity Bill Calculator

Calculate KEPCO residential electricity with progressive tier rates

🚰 Water & Gas Bill Calculator

Calculate Seoul water, sewage, and city gas bills

💒 Wedding Budget Planner (South Korea)

Plan Korean wedding costs: venue, studio, gifts & honeymoon

✈️ Travel Expense Calculator

Calculate flight/hotel/food/transport totals and per-person split

💳 Subscription Cost Calculator

Track Netflix/YouTube/Music subscription totals and find waste

🧾 VAT Calculator

Reverse calculate supply price, VAT (10%), and total amount

💪 Health Calculators

10

BMI, calorie, sleep, exercise & 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

👁️ Color Vision Test

Test your color perception with 10 challenges

🔥 BMR & Body Fat Calculator

BMR (3 formulas) + body fat % + TDEE calculation

📅 Date & Time Tools

15

Date calculations, D-Day, world clock, timers & more

🌙 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

📚 2027 CSAT D-Day (South Korea)

Countdown to Korea's College Scholastic Ability Test

🛍️ Black Friday

Check days until Black Friday sale

⏰ 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

🎯 Focus Timer

Flexible timer for deep work (90min focus, 50min study, 25min creative)

🌍 Timezone Meeting Planner

Find overlapping work hours between two cities

📅 Date Unit Converter

Convert days/months/years/minutes/seconds

🔢 Math & Unit Calculators

28

Percentage, unit conversion, statistics & math tools

📊 Percentage Calculator

Calculate percentages, increases, and decreases

💳 Tip Calculator

Calculate tips and split bills easily

🍽️ Dutch Pay Calculator

Split bills evenly

🧾 Group Settlement Calculator

Category-based expense management with minimum transfer settlement

📊 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

🔢 Decimal Rounding Tool

Round, ceil, floor numbers and add thousands separators

🧮 Base Converter

Convert between binary, octal, decimal, hexadecimal

📐 Coordinate Converter

Convert Lat/Lng, UTM, Plane Rectangular coordinates

🍳 Recipe Converter

Automatically scale ingredient quantities by serving size

📍 Distance Calculator

Calculate straight-line distance between two points

⛽ Fuel Efficiency Calculator

Calculate fuel economy (km/L) and trip costs

👗 Size Converter

Convert clothing & shoe sizes between KR, US, EU, UK, JP

🎓 GPA Calculator

Calculate college grade point average (4.5/4.3 scale)

🚀 Speed · Distance · Time

Calculate speed, distance, or time from physics formulas

🎨 Paint / Tile Calculator

Estimate paint cans and tile count by area

📝 CSAT Grade Calculator

Convert CSAT scores to grades with yearly grade cut tables

🎓 GPA Simulator

Calculate required grades in remaining credits for target GPA

🚖 Taxi Fare Calculator

Estimate Regular/Deluxe/Jumbo taxi fares by distance and time

🔢 Permutation & Combination

Calculate nPr, nCr with step-by-step solutions

🔗 GCD & LCM Calculator

Auto-calculate GCD/LCM with Euclidean algorithm

📊 Matrix Calculator

Matrix addition, multiplication, inverse & determinant

📐 Equation Solver

Solve linear & quadratic equations automatically

🔍 Prime Number Checker

Check primality, find Nth prime, factorize

📏 Shape Area/Volume Calculator

Circle, triangle, sphere, cylinder & more

🎮 Tests & Games

25

Typing, reaction, device tests & fun games

⌨️ 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

🎰 Lotto Generator

Generate random lottery numbers

🧩 Unit Conversion Quiz

Learn unit conversions through fun quiz games

🧠 Number Memory Game

Memorize increasingly longer numbers! Test your memory

🧩 Spreadsheet Number Puzzle

Excel-style grid puzzle matching row/column target sums

🌀 Gravity Puzzle

Change gravity direction to group and clear same-colored tiles

🛡️ Grid Protocol

Cross-toggle puzzle matching sums, ON-count, and anti-streak rules

🧩 Sudoku

Classic Sudoku puzzle - unlimited generation by difficulty

🔢 2048 Game

Slide number tiles to merge and reach 2048

🏁 Maze Game

Generate random mazes & solve them

🧮 Arithmetic Quiz

Solve math problems within time limit

💻 Developer Tools

18

JSON, regex, encoding, UUID & development tools

🔐 Base64 & URL Encoder/Decoder

Base64 and URL encoding/decoding tool

🔍 Regex Tester

Test regular expression patterns and view match results

🎯 Regex Cheatsheet

Common regular expression patterns collection

🔗 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

🔑 JWT Decoder

Decode and verify JWT tokens

🖥️ Browser/Device Info

User-Agent parsing, screen resolution, browser info

🔣 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

🌐 IP Address Lookup

Instantly check your public IP and geolocation

🔗 UTM Link Builder

Generate UTM parameter URLs for campaign tracking

🔤 HTML Entity Converter

Encode/decode HTML special character entities

🎨 Design & CSS Tools

12

Color, gradient, CSS layout & design tools

🎨 Color Code Converter

Convert HEX, RGB, HSL color codes in real-time

🎨 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

🎨 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

📐 Aspect Ratio Calculator

Calculate and convert image/video ratios

📏 Pixels to Inches

Convert between pixels and inches by DPI

✂️ CSS Clip-Path Generator

Visually edit clipping paths with drag controls

⏱️ Cubic Bezier Generator

Visualize animation timing functions

📝 Text & Document Tools

13

Character count, text conversion, speech 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)

🎙️ Speech to Text (STT)

Real-time voice recognition to text

🔊 Text to Speech (TTS)

Read text aloud with natural voices

📝 OCR Result Cleanup

Normalize line breaks, whitespace, and special characters

📇 Business Card to vCard

Extract name/phone/email from business card photos, save as vCard

😀 Emoji Search & Copy

Search emojis & copy with one click

🔐 Security Tools

4

Password, hash & email validation tools

🔐 Password Generator

Generate secure passwords and check strength

🔒 Password Strength Checker

Analyze password security strength

✉️ Email Validator

Validate email format and validity

🔐 Hash Generator

Generate MD5, SHA256 and other hashes

📱 QR/Barcode

2

QR code/barcode generation & scanning

📱 Barcode/QR Code Generator

Easily generate and download barcodes and QR codes

📱 QR Code Reader

Scan and decode QR codes

🖼️ Image Tools

30

Resize, filter, background removal & image editing

📐 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

🔍 AI Image Upscaler

Upscale images 2x/4x with Lanczos algorithm

🎨 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

📄 Image Text Extraction (OCR)

Extract text from images automatically (Korean/English/Japanese)

🎨 AI Style Transfer

Transform photos into oil painting, watercolor, pop art styles

🗺️ AI Depth Estimation

Generate 3D depth maps, visually distinguish near and far objects

✂️ 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

📷 Document Scanner

Scan documents with camera and apply filters

📸 ID Photo Maker

Create passport/resume photos with background change

😂 Meme Generator

Add text to images to create memes

🎨 Image Color Extractor

Extract color palettes from photos automatically

🖼️ Photo Collage

Combine multiple photos into one collage

⭐ Sticker Maker

Create custom stickers from your photos

👾 Pixel Art Converter

Convert photos into retro pixel art

🔄 AI Photo Restorer

Restore old/damaged photos with AI automatically

📄 PDF Tools

7

PDF viewer, merge, split, compress & convert

📄 PDF Viewer

View PDF files directly in browser

📎 PDF Merge

Combine multiple PDF files into one

✂️ PDF Split

Split PDF pages and extract

🗜️ PDF Compress

Reduce PDF file size

🖼️ PDF to Image

Convert PDF to PNG/JPEG images

🔒 PDF Redaction

Hide SSN/account numbers with black box overlay

📊 PDF/Receipt Table Extractor

Extract tables from PDFs, receipts, and documents to CSV/JSON

🎵 Music Tools

3

Metronome, BPM counter & note frequency

🎵 Metronome

Online metronome with adjustable BPM

🥁 BPM Counter

Tap to measure music BPM

🎹 Note Frequency Calculator

Musical note Hz frequency chart

🎲 Fun & Fortune

17

Saju analyzer, dream interpretation, name & zodiac compatibility

🎮 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

📛 Name Generator & Hanja

Korean name analysis with Hanja meanings & stroke fortune

🔍 Name Analyzer

Predict age, gender & nationality from any name using AI stats

🍸 Cocktail Recipe

Search cocktail recipes by name or ingredient

🍳 Meal Recipe

Search meal recipes by name or ingredient

🧠 Trivia Quiz

Test your knowledge across categories and difficulty levels

🔮 Saju Analyzer

Four Pillars of Destiny analysis from birth date & time

🌙 Dream Interpretation

Search traditional dream meanings by keyword

🤖 AI Face Analysis

AI analyzes face symmetry, shape, golden ratio & physiognomy

🐾 AI Animal Face Type

AI analyzes your face to find your animal doppelganger

🔮 Face Reading

Traditional physiognomy-based personality & fortune analysis

🃏 Tarot Card Reading

22 Major Arcana tarot reading

⏱️ Life Timer

See heartbeats, breaths, blinks and more in real-time

🩸 Blood Type Compatibility

Check love, friendship & work compatibility by blood type

⭐ Horoscope

Check today's horoscope and lucky info for 12 zodiac signs

Health-related calculators are for informational purposes only and do not constitute medical advice. Always consult a qualified healthcare professional.

Link copied!