Category
Free Online Calculators
Free online calculators for everyday math — tip, bill splitting, birthday, days between dates, and more.
Age Calculator
Free age calculator. Enter your date of birth to find your exact age in years, months, and days. Also shows total days, weeks, and hours lived.
Area Calculator
Calculate the area of a rectangle, circle, triangle, trapezoid, ellipse, and more — with formulas explained.
Average Calculator
Calculate the mean, median, mode, min, max, sum, and count of a list of numbers instantly.
Bill Splitter
Free bill splitter calculator. Enter the total bill, tip percentage, and number of people to find out exactly how much each person owes.
Free Birthday Calculator
Free birthday calculator. Enter your birth date to find your exact age in years, months, and days, plus a countdown to your next birthday.
Free BMI Calculator
Free BMI calculator. Enter your height and weight in metric or imperial units to get your Body Mass Index and see which BMI category you fall into.
Compound Interest Calculator
Calculate compound interest and see how your investment grows over time — free online compound interest calculator.
Days Between Two Dates Calculator
Free date calculator. Enter any two dates to get the exact number of days, weeks, months, and years between them. Results update instantly.
Discount Calculator
Calculate the sale price and money saved for any discount percentage — free online discount calculator.
Dog Years Calculator
Convert your dog's age to human years using both the simple multiply-by-7 method and the scientifically accurate formula based on DNA methylation.
Golf Handicap Calculator
Calculate your golf handicap index using the World Handicap System (WHS) formula with course rating and slope rating.
GPA Calculator
Free GPA calculator. Add your courses, grades, and credit hours to calculate your cumulative GPA on a 4.0 scale instantly.
Heart Rate Zone Calculator
Calculate your 5 heart rate training zones based on your age or maximum heart rate.
Inflation Calculator
Free inflation calculator. Enter an amount and annual inflation rate to see how purchasing power changes over time, with a year-by-year breakdown.
Interest Calculator
Free interest calculator. Calculate simple and compound interest — enter your principal, rate, and time to see final balance, total interest earned, and a year-by-year breakdown.
Loan Calculator
Calculate monthly loan repayments, total interest paid, and the full repayment schedule for any loan — free online loan calculator.
Maintenance Calories Calculator
Calculate your maintenance calories (TDEE) based on your age, height, weight, sex, and activity level.
Free Mortgage Calculator
Free mortgage calculator. Enter your loan amount, interest rate, and loan term to calculate your monthly payment, total interest, and full amortization schedule.
Odds Converter
Convert betting odds between decimal, fractional, American (moneyline), and implied probability formats instantly.
Percentage Calculator
Free percentage calculator. Find what percent one number is of another, calculate percentage increase or decrease, and work out percentage of a total.
Pregnancy Weeks Calculator
Calculate how many weeks pregnant you are and your due date from your last menstrual period (LMP).
Ratio Calculator
Simplify ratios, scale them up or down, and solve for a missing value in a proportion.
Rent vs Buy Calculator
Should you rent or buy a home? Compare the true cost of renting vs buying over time, including mortgage, taxes, maintenance, and home equity.
ROI Calculator
Calculate return on investment (ROI) from your initial cost and final value, with annualised ROI for multi-year investments.
Rounding Calculator
Free rounding calculator. Round any number to the nearest whole number, tenth, hundredth, or custom decimal place. Instant results shown.
Square Footage Calculator
Calculate the square footage of a room or space from its length and width. Add multiple rooms and get the total.
Standard Deviation Calculator
Calculate the standard deviation, variance, and mean of a list of numbers. Supports both population and sample standard deviation.
Free Tip Calculator
Free tip calculator. Enter your bill total and choose a tip percentage to instantly see the tip amount and grand total per person or for the group.
Wedding Anniversary Calculator
Free wedding anniversary calculator. Enter your wedding date to see how long you've been married and which traditional anniversary year you're celebrating.
Our free online calculators handle everyday math so you don't have to. From splitting a restaurant bill and working out a tip, to finding your age in days, calculating your BMI, or the exact days between two dates — each tool gives an instant, accurate result with no sign-up required. All calculations run in your browser, so your data stays private.