All Calculators

Calculator

A free online calculator you can use right in your browser. Supports addition, subtraction, multiplication, division, percent, and sign toggle, with full keyboard input.

Scientific Calculator

A free online scientific calculator with sine, cosine, tangent, logarithms (log and ln), exponents, and square roots. Type full expressions with parentheses, operator precedence, and DEG/RAD angle modes.

Fraction Calculator

Add, subtract, multiply, and divide fractions with automatic simplification. A free fraction calculator that shows the result as a simplified fraction, mixed number, and decimal.

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal numbers instantly. A free base converter powered by BigInt for exact results with no digit limit.

Character Counter

Count characters with and without spaces, bytes, words, and lines in real time. A free character counter for personal statements, essays, and reports with length limits.

Unit Converter

Convert length, weight, temperature, area, data, and speed units instantly. A free unit converter for inch to cm, pound to kg, mile to km, Fahrenheit to Celsius, and more.

Lotto Number Generator

Free number generator for Korean Lotto 6/45. Instantly draws 6 unique numbers from 1–45 for up to 5 games at once, displayed in the official lotto ball colors.

QR Code Generator

Enter any text or URL to instantly create a QR code and save it as a PNG. Free and unlimited with no sign-up or watermark — everything is processed in your browser, nothing is sent to a server.

VAT Calculator (Korea 10%)

Calculate Korean VAT (10%) automatically. Add VAT to a net amount or extract VAT from a tax-inclusive total with this free VAT calculator.

Korea Salary Take-Home Pay Calculator

Estimate your monthly take-home pay from a Korean annual salary. Deducts the four major insurances (pension, health, long-term care, employment) and income tax at 2026 rates.

Loan Payment Calculator

Enter a loan amount, annual interest rate, and term to calculate your monthly payment and total interest. Supports amortized, equal-principal, and interest-only (bullet) repayment.

Korea Severance Pay Calculator

Estimate your Korean severance pay (toejikgeum) under the Employee Retirement Benefit Security Act. Enter your start date, end date, and recent salary to see your average daily wage and expected payout.

Hourly Wage to Monthly Salary Calculator

Convert an hourly wage to a monthly salary under Korean labor rules. Enter your hourly rate, daily hours, and days per week to get weekly and monthly pay including weekly holiday pay (juhyu sudang).

Korea Weekly Holiday Pay Calculator

Calculate Korea's weekly holiday pay (juhyu sudang) from your hourly wage and weekly working hours. See weekly and monthly amounts plus your effective hourly rate with this free calculator.

Savings Interest Calculator

Calculate interest on installment savings (monthly deposits) or a lump-sum time deposit, with simple or monthly compound interest and Korea's 15.4% interest income tax.

BMI Calculator

Calculate your BMI (Body Mass Index) from height and weight and see whether you are underweight, normal, overweight, or obese. A free BMI calculator using the Asia-Pacific criteria.

Calorie Calculator (BMR & TDEE)

Calculate your BMR (basal metabolic rate) and daily calorie needs (TDEE) from your sex, age, height, weight, and activity level. A free calorie calculator using the Mifflin-St Jeor equation.

Pyeong to Square Meters Converter

Convert square meters (m²) to pyeong and pyeong to square meters instantly. A free converter for understanding Korean apartment sizes, exclusive area, and supply area.

Korean Age Calculator

Calculate your international age and Korean year age from your date of birth. This free age calculator follows Korea's 2023 age standardization law and also shows your zodiac sign and days until your next birthday.

Percentage Calculator

Find what percent one value is of another, calculate percentage increase or decrease, and get X% of any number. A free percentage calculator for discounts, raises, and ratios.

Date Difference Calculator (D-day)

Calculate the number of days, weeks, months, and years between two dates. A free date calculator for D-day countdowns, anniversaries, and working-day estimates.

Korea Military Discharge Date Calculator

Calculate your discharge date from mandatory military service in South Korea. Enter your enlistment date and branch (Army, Marines, Navy, Air Force) to see your discharge D-day and service progress.

Working Days Calculator

Count the working days (weekdays excluding weekends) between two dates. A free business-day calculator for payroll proration, project schedules, and deadlines.

Pregnancy Due Date Calculator

Calculate your pregnancy due date and current week of pregnancy from your last menstrual period. Based on Naegele's rule with cycle-length adjustment, including a D-day countdown and trimester.