Every calculator you need, in one place
VAT, BMI, pyeong, age, date difference, percentages and more.
Free to use — no sign-up required.
Calculator list
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.
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.
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.
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.
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.
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 2025 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.
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.
What is CalcHub?
Free · No sign-up
Use every calculator without limits, for free. No login or installation required.
Accurate standards
Reflects up-to-date Korean standards such as the international age law and KSSO BMI criteria.
Examples and FAQ
We don't just show results. Each calculator comes with worked examples and frequently asked questions.