Finance/Tax Calculators
VAT & Tax Calculator
Calculate VAT inclusive/exclusive and withholding tax for business income.
Retirement Pay Calculator
Automatically calculate expected retirement pay based on years of service and average salary.
Loan Interest Calculator
Calculate loan repayment amount and total interest for equal installment methods.
Loan Repayment Simulator
Calculate monthly payment and total interest by repayment method. (2025 standard)
Savings Calculator
Simulate how much you can save in a year by quitting smoking, coffee, etc.
Deposit Interest Calculator
Calculate total interest and after-tax amount. Choose compound/simple interest. (2025 standard)
Salary Converter
Automatically calculate hourly/monthly wage based on annual salary and weekly hours.
Salary Increase Calculator
Automatically calculate salary increase rate and suggest appropriate increase based on 2025 inflation rate (2.3%). Real wage growth analysis.
Salary Projection Calculator
desc_salary_projection
Stock Valuation Calculator
Calculate valuation, average price, and required shares. Useful for stock investment.
Credit Card Payoff Calculator
Enter current balance, interest rate, monthly payment to calculate payoff period and total interest.
calc_stock_option_tax
desc_stock_option_tax
calc_transfer_tax
desc_transfer_tax
calc_gift_tax
desc_gift_tax
calc_income_tax
desc_income_tax
calc_property_holding_tax
desc_property_holding_tax
Lottery
Perfect Lotto Generator
Generate Lotto 6/45 combinations from selected numbers. Real-time analysis of even/odd, high/low, and number distribution for optimal combinations.
Filtering Lotto Generator
Create optimal lotto combinations with 7-step filtering by scientifically selecting exclusion numbers. Various conditions such as fixed numbers, consecutive numbers, AC values can be set.
Smart Lotto Generator
AI automatically generates balanced combinations by simply selecting desired numbers without complex settings.
Lotto Combination Analyzer
Analyze all statistics of entered numbers in detail including AC value, odd/even, high/low, prime numbers, composite numbers, ending digits.
Pick Numbers Lotto Generator
Select 12 or 20 numbers and generate optimal 6-number combinations from them. Suitable for expert fixed number strategies.
Semi-Auto Lotto Generator
Select 1-4 core numbers and heuristic algorithm fills remaining numbers to complete balanced combination.
Real Estate/Housing
Rent Calculator
Convert deposit to monthly rent and vice versa. Applies rental conversion rate.
Rent vs Buy Calculator
Compare renting vs buying from long-term perspective. Financial analysis considering opportunity cost, loan interest, price appreciation, taxes. (2025 standard)
Real Estate Acquisition Tax
Automatically calculate acquisition tax, education tax, and special rural tax based on purchase price and number of homes. (2025 standard)
Capital Gains Tax Calculator
Calculate capital gains and tax when selling real estate. Auto-determine 1 home tax exemption. (2025 standard)
Property Tax Calculator
Automatically calculate comprehensive real estate tax based on official price and number of homes. (2025 standard)
Real Estate ROI Calculator
Automatically calculate actual ROI considering rental income, expenses, and loan interest. (2025 standard)
Registration Cost Calculator
Calculate total costs including stamp duty, registration fees, legal fees based on sale price. (2025 standard)
calc_commission
desc_commission
calc_home_afford
desc_home_afford
Health/Exercise
Date/Time
Age Calculator
Calculate international age, Korean age, and year age from date of birth.
Workday Calculator
Automatically calculate weekdays/weekends for a specific period.
Moving Day Calculator
Find auspicious days for moving based on Korean tradition. Monthly calendar shows good moving days (Son-eomneun-nal).
Moving Checklist
Step-by-step checklist from pre-move preparation to post-move organization. Prepare for a perfect move without missing anything.
calc_baby_milestone
desc_baby_milestone
calc_day_of_week
desc_day_of_week
calc_week_number
desc_week_number
calc_date_calc
desc_date_calc
calc_golden_hour
desc_golden_hour
calc_49jae
desc_49jae
calc_dday
desc_dday
calc_months
desc_months
calc_leap_year
desc_leap_year
calc_lunar_solar
desc_lunar_solar
calc_expiry_date
desc_expiry_date
calc_holiday
desc_holiday
Transportation/Utilities
Fuel Calculator
Calculate estimated fuel costs based on distance and fuel efficiency. Supports electric and hybrid vehicles.
Car Tax Calculator
Automatically calculate acquisition tax and registration fees based on vehicle price.
Electricity Bill Calculator
Calculate household/industrial rates based on usage (kWh).
Water Bill Calculator
Automatically calculate household water bill based on usage.
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Other Utilities
Parcel Tracker
Integrated tracking for major courier services (CJ, Hanjin, Post Office, Logen). Check delivery status by tracking number.
calc_zodiac
desc_zodiac
calc_samjae
desc_samjae
calc_area_code
desc_area_code
calc_zodiac_sign
desc_zodiac_sign
calc_pet_age
desc_pet_age
calc_dutch_pay
desc_dutch_pay
calc_tip
desc_tip
calc_random
desc_random
calc_country_code
desc_country_code
calc_box_volume
desc_box_volume
calc_computer_elec
desc_computer_elec
Inch Converter
Convert inches to centimeters, millimeters, and meters. Easy tool for converting TV, monitor sizes, and pipe specifications from inches to metric units.
Pound Converter
Convert pounds to kilograms and grams. Easy tool for converting body weight and cargo weights from pounds to metric units.
Mile Converter
Convert miles to kilometers and meters. Easy tool for converting driving and jogging distances from miles to metric units.
Ounce-ml Converter
Convert fluid ounces to milliliters and liters. Easy tool for converting beverage volumes and recipe measurements from ounces to metric units.
Hectare Converter
Convert hectares to pyeong, square meters, and acres. Easy tool for converting farmland and land areas from hectares to Korean pyeong and other units.
GCF Calculator
Calculate the greatest common factor (GCF) of two or more numbers using Euclidean algorithm with prime factorization visualization. Useful for fraction reduction and ratio calculations.
Prime Number Calculator
Primality testing, prime factorization, prime generation with Sieve of Eratosthenes, and twin prime finder. Useful for mathematics and cryptography.
Fibonacci Sequence Calculator
Generate Fibonacci sequence up to 100 terms and analyze golden ratio convergence. Calculate nth term directly using Binet's formula.
Confidence Interval Calculator
Confidence interval calculator using Z-distribution (large sample) and T-distribution (small sample). Calculate mean/proportion CI, sample size, and margin of error.
P-Value Calculator
P-value calculator using Z-test and T-test. Used for hypothesis testing, significance level analysis, and statistical significance determination.
Percent Error Calculator
Calculate percent error between measured and actual values. Useful tool for experimental error analysis and measurement accuracy evaluation.
Polynomial Factorization Calculator
Factorize quadratic and cubic polynomials and find roots. Calculate real and complex roots using quadratic formula and discriminant.