Free online calculators — 30+ tools for loans, currency, BMI and more, with no signup.
Calculation & Conversion
Free online basic calculator with support for addition, subtraction, multiplication, division, square roots, and parentheses. Fast, accurate, and easy to use.
Advanced scientific calculator with trigonometric functions, logarithms, exponents, factorials, and constants. Perfect for students, engineers, and professionals.
Convert between units of length, weight, area, volume, time, temperature, speed, and data storage. Supports metric, imperial, and many other unit systems.
Convert currencies instantly with real-time exchange rates. Supports 150+ world currencies including USD, EUR, GBP, JPY, KRW, and cryptocurrency rates.
Convert numbers between decimal, hexadecimal, binary, and octal systems instantly. Essential tool for programmers, developers, and computer science students.
Financial & Shopping
Calculate the final discounted price from the original price and discount percentage. See how much you save and the actual price you pay after discount.
Calculate percentage changes, increases, decreases, and ratios with ease. Find what percent one number is of another or calculate percentage differences.
Compare unit prices of multiple products side by side to find the best value for your money. Supports different quantities and units for smart shopping.
Calculate tips based on your bill amount and desired tip percentage. Split the total evenly among multiple people for easy group dining and shared expenses.
Calculate compound interest on deposits and savings accounts. Compare different interest rates, terms, and compounding periods to maximize your returns.
Calculate VAT (Value Added Tax), supply price, and total price including tax. Supports multiple tax rates for different countries and product categories.
Calculate net profit margin by entering selling price, cost price, and additional fees. Analyze profitability and optimize pricing for your products or services.
Calculate your break-even point and target sales quantity by entering fixed costs, variable costs, and selling price. Essential for business planning and analysis.
Calculate monthly loan payments, total interest, and amortization schedules. Compare different loan amounts, interest rates, and repayment periods easily.
Estimate Korean monthly and annual take-home pay after the four major insurances (national pension, health, long-term care, employment) and income/local taxes. Supports dependents, children, and the non-taxable meal allowance.
Estimate Korean statutory severance pay from your hire date, retirement date, last 3 months of wages, annual bonus and unused-leave allowance, based on the average daily wage × 30 days × years of service formula.
Enter principal, annual rate, term, compounding frequency, and a monthly contribution to see how compound interest grows your balance, with a year-by-year breakdown.
Estimate Korean real-estate capital gains tax from sale price, purchase price, expenses, asset type, and holding/residence years — including 1-house exemption, long-term holding deduction, short-term penalty rates, and the 10% local surtax.
Lifestyle & Health
Calculate the number of days between two dates or find a future/past date by adding or subtracting days. Useful for planning deadlines and tracking events.
Calculate Korean man age (international age), counting age, and year age from your birth date. Also shows the total days lived and the countdown to your next birthday.
Count the days remaining until a target date (D-N), the days that have passed (D+N), or simply confirm D-day. Add a start date to also see the percentage progress through the period.
Enter your monthly kWh usage to estimate a Korean residential (low-voltage) electricity bill — base charge, progressive energy charges, 10% VAT, and 3.7% industry fund. Summer relaxation for July–August is supported.
Convert between Korean pyeong (평), square meters (m²), and square feet (ft²). 1 pyeong = 400/121 m² ≈ 3.3058 m² — great for comparing Korean real-estate listings with metric or imperial measurements.
Calculate your Grade Point Average (GPA) by entering course grades and credit hours. Supports 4.0, 4.3, and 4.5 grading scales used by universities worldwide.
Calculate your Body Mass Index (BMI) and Basal Metabolic Rate (BMR) to assess your health status. Get personalized weight category and daily calorie estimates.
Calculate your vehicle's fuel economy (MPG or km/L) by entering distance traveled and fuel consumed. Track and compare fuel efficiency over multiple trips.
Estimate fuel costs for any trip by entering distance, your vehicle's fuel economy, and current fuel price. Plan your travel budget accurately and save money.