Math Calculators
Free math calculators for everyday calculations — percentages, fractions, area, and more. Get instant, accurate results.
Percentage Calculator
Calculate percentages quickly with three modes: find X% of Y, find what percent X is of Y, and calculate percentage change between two values.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions. Automatically simplifies results and converts between fractions and mixed numbers.
Age Calculator
Calculate your exact age in years, months, and days. Find total days lived, weeks, and your next birthday countdown from any date of birth.
Square Footage Calculator
Calculate the area of any space in square feet. Supports rectangular, circular, and triangular shapes with unit conversions between sq ft, sq m, and acres.
Angle Converter
Convert between degrees, radians, gradians, and turns. Essential for math, engineering, and programming where different angle units are used.
Area Converter
Convert between square inches, square feet, square yards, acres, square miles, square centimeters, square meters, hectares, and square kilometers.
College GPA Calculator
Calculate your semester and cumulative GPA. Add your courses with credit hours and grades to see where you stand on the 4.0 scale.
Data Storage Converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Uses standard SI (base-10) definitions.
Energy Converter
Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and BTUs. Useful for science, nutrition, and energy cost comparisons.
Final Grade Calculator
Find out exactly what score you need on your final exam to achieve your desired course grade. Enter your current grade and the exam's weight to see your target.
Frequency Converter
Convert between hertz, kilohertz, megahertz, gigahertz, and RPM. Useful for electronics, audio engineering, and mechanical applications.
Fuel Economy Converter
Convert between miles per gallon (MPG), kilometers per liter (km/L), and liters per 100 kilometers (L/100km). Compare fuel efficiency across different measurement systems.
GPA Calculator
Calculate your semester or cumulative GPA. Add your courses with grades and credit hours to see your grade point average on the standard 4.0 scale.
Length Converter
Convert between inches, feet, yards, miles, millimeters, centimeters, meters, and kilometers. Enter a value and see all conversions instantly.
Power Converter
Convert between watts, kilowatts, horsepower, BTU per hour, and foot-pounds per second. Useful for comparing engines, motors, and electrical equipment.
Pressure Converter
Convert between psi, bar, atmospheres, pascals, kilopascals, mmHg, and inHg. Essential for engineering, weather, and tire pressure conversions.
Speed Converter
Convert between miles per hour, kilometers per hour, meters per second, feet per second, and knots. Enter a speed and see all conversions instantly.
Study Hours Calculator
Calculate how many hours you should study each week based on your course load and difficulty levels. Get a personalized weekly study plan for each class.
Temperature Converter
Convert temperatures between Fahrenheit, Celsius, and Kelvin instantly. Enter a value in any unit and see the equivalent in all other scales.
Time Converter
Convert between seconds, minutes, hours, days, weeks, and years. Enter a time value and see the equivalent in all other common time units instantly.
Time Zone Converter
Convert times between any two time zones instantly. Select your source and target time zones, enter the time, and see the converted result with day change indicators.
Unit Converter
Convert between common units of length, weight, temperature, and volume instantly. Select a category, enter your value, and see the result in real time.
Volume Converter
Convert between teaspoons, tablespoons, fluid ounces, cups, pints, quarts, gallons, milliliters, and liters. Perfect for cooking and recipe conversions.
Weight Converter
Convert between ounces, pounds, stones, grams, and kilograms. Enter a weight in any unit and see the equivalent in all other common weight units instantly.