Free Online Calculators for Loans, Currency, BMI & More

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.

Check current time in major cities worldwide and convert between time zones instantly. Essential for scheduling international meetings and global collaboration.

Convert between solar (Gregorian) and lunar calendar dates easily and accurately. Includes traditional holiday dates and supports a wide range of years.

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 take-home pay after the four major insurances and income/local taxes, with support for dependents, children, and meal allowance.

Estimate Korean statutory severance pay from hire and retirement dates and your last 3 months of wages, using the average daily wage × 30 × years 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 and purchase price, expenses, and holding years — with 1-house exemption and long-term deduction.

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 days remaining until a target date (D-N), days passed (D+N), or confirm D-day. Add a start date to see your percentage progress through the period.

Estimate a Korean residential electricity bill from monthly kWh usage — base charge, progressive energy charges, 10% VAT, fund, and summer relaxation.

Convert between Korean pyeong, square meters (m²), and square feet (ft²). 1 pyeong ≈ 3.3058 m² — ideal for comparing real-estate listings.

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 ovulation date and fertile window based on your menstrual cycle length and last period date. Track your most fertile days for family planning.

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.