판매세 계산기 - 세율 계산기
판매세와 최종 가격을 즉시 계산하세요. 미국 주별 세율과 사용자 정의 세율 옵션이 있는 무료 온라인 판매세 계산기.
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Markdown to HTML Converter
Convert Markdown to HTML instantly with live preview. Free online tool for developers, bloggers, and writers.
Strong Password Generator
Generate secure, random passwords with customizable length and character options. Free online password generator with strength meter.
BMI Calculator - Body Mass Index
Calculate your Body Mass Index (BMI) instantly. Free online BMI calculator with health categories and weight status.
BMR Calculator - Basal Metabolic Rate
Calculate your Basal Metabolic Rate (BMR) and daily calorie needs instantly. Free online BMR calculator with TDEE and macronutrient breakdown.
Body Fat Calculator - Body Fat Percentage
Calculate your body fat percentage instantly using the US Navy method. Free online body fat calculator with lean mass and health category analysis.
Percentage Calculator
Calculate percentages instantly. Free online percentage calculator for discounts, tips, taxes, scores, and more.
Age Calculator
Calculate your exact age from birthdate instantly. Free online age calculator with years, months, days and detailed statistics.
Color Converter (HEX/RGB/HSL)
Convert colors between HEX, RGB, and HSL formats instantly. Free online color converter for designers and developers.
Unit Converter
Convert units instantly - length, weight, temperature, volume, area, speed, and more. Free online unit converter for everyday use.
QR Code Generator
Generate custom QR codes instantly for URLs, text, WiFi, emails, and more. Free online QR code creator with download option.
Hash Generator (MD5/SHA-1/SHA-256/SHA-512)
Generate cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) instantly. Free online hash generator for developers and security professionals.
JSON Formatter & Validator
Format, validate, and minify JSON instantly. Free online JSON tool for developers with syntax highlighting and error detection.
UUID/GUID Generator & Validator
Generate UUIDs (v1, v3, v4, v5) and validate UUID formats. Free online UUID generator for developers with batch generation.
Time Zone Converter - World Clock
Convert time between time zones instantly. Free online world clock and time zone converter for global meetings and travel planning.
Word & Character Counter - Text Analyzer
Count words, characters, paragraphs, and sentences in real-time. Perfect for writers, students, and content creators.
Calorie Calculator - TDEE & Macros
Calculate your daily calorie needs, TDEE (Total Daily Energy Expenditure), and macronutrient breakdown. Free online calorie calculator for fitness and weight management.
Base64 Encoder/Decoder
Encode or decode Base64 data instantly. Free online Base64 converter for developers with URL-safe and line-wrap options.
Loan & Mortgage Calculator
Calculate loan payments, mortgage installments, and total interest instantly. Free online loan calculator with amortization schedule and extra payment analysis.
Case Converter - Text Case Changer
Convert text between UPPER, lower, Title, Camel, snake, kebab and more cases instantly. Free online text case converter for developers and writers.
Date Calculator - Days Between Dates
Calculate days between dates, add/subtract days from a date, and find exact date differences. Free online date calculator.
Tip Calculator - Restaurant Gratuity Calculator
Calculate restaurant tips and split bills instantly. Free online tip calculator with customizable tip percentages and bill splitting.
Water Intake Calculator - Daily Hydration Calculator
Calculate your daily water intake needs based on weight, activity level, and conditions. Free online hydration calculator with personalized recommendations.
Discount Calculator - Sale Price Calculator
Calculate discounts and final prices instantly. Free online discount calculator with percentage off, amount off, and multiple discount options.
Inflation Calculator - Purchasing Power Calculator
Calculate inflation and purchasing power changes over time. Convert dollar amounts between different years using CPI data. Free online inflation calculator.
Pregnancy Due Date Calculator - Baby Due Date Calculator
Calculate your baby's due date instantly from your last period date. Free online pregnancy calculator with trimester info, milestones, and pregnancy week tracker.
Ovulation Calculator - Fertile Window & Ovulation Date
Calculate your fertile window and ovulation date instantly. Free online ovulation calculator to help plan pregnancy with accurate fertile days prediction.
Crypto Profit Calculator - Investment Return Calculator
Calculate cryptocurrency investment profits and losses with buy/sell prices, fees, and ROI analysis. Free online crypto profit calculator.
Currency Converter - Exchange Rate Calculator
Convert currency between USD, EUR, KRW, JPY, GBP and more. Free online exchange rate calculator with real-time rates.
Aspect Ratio Calculator - Video/Image Ratio Calculator
Calculate aspect ratios instantly for videos, images, and screens. Free online ratio calculator with common presets and scaling dimensions.
GPA Calculator - Grade Point Average
Calculate your GPA (Grade Point Average) instantly. Free online GPA calculator with letter grade and percentage options for students.
Stopwatch - Online Timer with Lap Function
Free online stopwatch with millisecond precision, lap function, and pause/resume capabilities. Perfect for timing workouts, cooking, and more.