Free Math Calculators Online – Percentage, CGPA, BMI, Age & More
From percentage calculations to CGPA, BMI to countdown timers - these free math calculators online cover the numeric tasks that appear constantly in everyday academic and professional life. Every calculator runs in your browser and updates as you type, and some show their working - the Mixed Fraction Calculator lists each step, and the Age Calculator gives total months and weeks alongside the exact age. No math background needed; no app install required.
Percentage Calculator
Free online math tool to calculate percentages instantly.
CGPA Calculator
Calculate your semester GPA and cumulative CGPA using courses, grades, and credit hours, with multiple grading scales and Excel import supported.
Age Calculator
Free online age calculator to find exact age in years, months, days, total weeks, and next birthday countdown from date of birth.
BMI Calculator
Free BMI calculator to check body mass index, healthy weight range, and approximate weight change from height and weight.
Discount Calculator
Free online discount calculator to find sale price, savings amount, final checkout total, and tax impact from original price and discount percentage.
Average Calculator
Free online average calculator to find mean, median, total sum, and count from a list of numbers for marks, prices, and datasets.
Scientific Calculator
Free scientific calculator online for arithmetic expressions, brackets, powers, square roots, and fast math calculations.
Fraction Calculator
Free fraction calculator to add, subtract, multiply, divide, and simplify fractions with decimal, mixed number, and percentage output.
Mixed Fraction Calculator
Calculate addition, subtraction, multiplication, and division of mixed numbers with exact reduced fractions, improper fraction conversion, and step-by-step solutions.
Time Duration Calculator
Free time duration calculator to find the difference between two dates and times in days, hours, and minutes.
Unit Converter
Free online unit converter for length, weight, and temperature conversions used in school, travel, shipping, and daily calculations.
Pomodoro Timer
Free online Pomodoro timer with customizable focus and break durations. Track sessions, manage short and long breaks, and stay productive.
Random Number Generator
Free online random number generator to generate single or multiple random numbers within any range. Set min, max, and quantity. Browser-based, no login, instant results.
Countdown Timer
Free online countdown timer to any future date and time. See exactly how many days, hours, minutes, and seconds remain until your event, deadline, or launch date.
Aspect Ratio Calculator
Free online aspect ratio calculator. Enter any two dimensions to find the missing value while keeping the correct aspect ratio for images, videos, and screens.
How to use these tools
Select the tool that matches your task, open it, and follow the steps below.
- Pick the calculator for the question: a percentage, a fraction or mixed number, an average, an age or date span, an aspect ratio, a unit conversion, or a timer.
- Enter your numbers or dates. Results update as you type, and nothing you enter is sent to a server.
- Read the result and the limits listed on that page - for example, the Unit Converter covers length, weight and temperature only.
Common ways to use these tools
- Work out a tip, a test score as a percentage (45 out of 60 is 75%), or the percent change between two prices.
- Add, subtract, multiply or divide fractions and mixed numbers and see the simplified result and its decimal value.
- Find the mean, median and sum of a list of marks or measurements.
- Check an exact age in years, months and days, or the time between two dates in days, hours and minutes.
- Keep a video or image in proportion - 1920×1080 at 16:9 scaled to a width of 1280 is 1280×720.
- Run 25-minute Pomodoro focus sessions with short and long breaks, or count down to a date and time.