Quick calculators for tax, ratios, units, and everyday math.
A scientific calculator with trig, log, roots, exponents, and factorials.
Find X% of a number, what percent one value is of another, and percent change.
Compute PPI (DPI), aspect ratio, megapixels, and dot pitch from resolution and screen size.
Enter the price and discount to see the final price and how much you save.
Simplify a ratio or solve a proportion like A:B = C:?.
Convert between binary, octal, decimal, and hexadecimal.
Compute your GPA from course credits and grades. Supports 4.5/4.3/4.0 scales.
Get mean, median, standard deviation, variance, and more from a list of numbers.
Convert length, weight, temperature, and speed units.
Instantly calculate net amount, VAT, and gross total — both adding and extracting VAT.
Estimate monthly take-home pay after Korean social insurance and income tax.
Calculate Korean national pension, health, long-term care, and employment insurance from monthly pay.
Compute Korean income tax and local tax from a taxable base using progressive rates.
Estimate monthly withheld income and local tax from pay and number of dependents.
Estimate Korean severance pay from start/end dates and average salary.
Compute Korean weekly holiday pay, weekly and monthly pay from hourly wage and hours.
Calculate Korean annual-leave allowance from monthly ordinary wage and unused days.
Compute the Korean 3.3% freelancer withholding — both gross↔net directions.
Calculate monthly repayment and total interest with equal-payment or equal-principal methods.
Calculate maturity amount and after-tax interest for installment/lump savings (simple or compound).
Project future value from principal, rate, term, compounding frequency, and contributions.
Estimate the early-repayment fee from amount, fee rate, and remaining term.
Compute Korean DSR and DTI ratios from income and loan repayments to gauge borrowing limits.
Convert between Korean jeonse deposit and monthly rent using the conversion rate.
Calculate Korean property acquisition tax, education tax, and rural tax from the price.
Calculate the maximum Korean realtor commission for sales and leases.
Estimate Korean capital gains tax and local tax from the gain and holding period.
Calculate Korean property tax and education tax from the official price and fair-market ratio.
Convert between the Korean area unit pyeong and square meters (m²).
Estimate total Korean property registration costs: acquisition tax, stamp duty, bonds, and scrivener fees.
Find the maximum mortgage and additional borrowing limit from home price and LTV ratio.
Calculate annual Korean car tax and education tax from engine size and vehicle age.
Calculate fuel needed and total fuel cost from distance, economy, and price.
Compute fuel economy (km/L) and liters per 100 km from distance and fuel used.
Calculate Korean car acquisition tax by price and vehicle type, including light-car relief.
A reference table of Korean fines and demerit points for speeding, signals, parking, and DUI.
Find a date N days before/after, or count the days between two dates.
Calculate Korean military discharge date, D-day, and service progress from enlistment date and branch.
Estimate your due date and current gestational age from the last menstrual period.
Find your body mass index (BMI), weight category, and healthy weight range.
Calculate ideal body weight and healthy range from height and sex.
Estimate basal metabolic rate and daily calorie needs (TDEE) from sex, age, height, and weight.
Estimate calories burned from exercise type, body weight, and duration.