Category
Free Online Calculators
Free online calculators for everyday math — tip, bill splitting, birthday, days between dates, and more.
Acceleration Calculator
Acceleration calculator. Enter initial velocity, final velocity, and time to calculate acceleration. Includes the acceleration formula and examples.
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.
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.
Business Days Calculator
Free business days calculator. Calculate working days between dates excluding weekends and holidays. Add custom holidays for accurate business day counting in any country.
Countdown Calculator
Free countdown calculator. Calculate the exact number of days, hours, minutes, and seconds until your event, deadline, or special date. Perfect for weddings, vacations, project deadlines, and birthdays.
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.
Fraction Calculator - Add, Subtract, Multiply, Divide
Free fraction calculator. Add, subtract, multiply, and divide fractions with step-by-step solutions. Simplify fractions and convert between mixed numbers and improper fractions.
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.
Median Calculator
Median calculator. Paste a list of numbers to instantly find the median (middle value). Includes the median formula, steps, and a worked example. Free and easy to use for statistics and data analysis.
Military Time Converter
Free military time converter. Convert between 24-hour military time and 12-hour standard time instantly. Perfect for reading military schedules, train times, and international formats.
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.
Probability Calculator
Free probability calculator. Calculate the probability of events, conditional probability, union, intersection, and complementary probability with step-by-step explanations.
Ratio Calculator
Simplify ratios, scale them up or down, and solve for a missing value in a proportion.
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
Standard deviation calculator with steps on how to calculate standard deviation by hand. Computes standard deviation, variance, and mean for a list of numbers (sample or population).
Time Zone Converter - World Time
Free time zone converter. Convert times between different time zones worldwide. Compare local times across cities and schedule international meetings with ease.
Triangle Calculator
Free triangle calculator. Solve triangles using SSS, SAS, ASA, or AAS methods. Calculate area, perimeter, angles, and side lengths with step-by-step solutions.
Velocity Calculator
Velocity calculator. Enter distance and time to calculate average velocity in m/s, km/h, mph, or ft/s. Includes the velocity formula, examples, and multiple unit conversions. Free physics tool.
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.
Working Days Calculator
Free working days calculator. Calculate the number of business days between two dates, excluding weekends. Perfect for project planning, deadline tracking, and calculating delivery times.
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.