Math Calculators
45 free tools
Percentage
Fractions & Ratios
Basic Math
- Factor CalculatorAll factors, factor pairs and prime factors of a number
- HCF Calculator (GCF / GCD)Greatest common factor of two or more numbers
- LCM CalculatorLeast common multiple of two or more numbers
- Long Division CalculatorQuotient and remainder, with every step shown
- Rounding CalculatorRound to decimal places, tens, hundreds or significant figures
- Scientific CalculatorFree online calculator with trig, logs, powers and roots
Algebra
- Exponent CalculatorPowers of any number, including negative and fractional exponents
- Log Calculator (Logarithm)Logarithm of any number in any base
- Quadratic Equation CalculatorSolve ax² + bx + c = 0 with steps
- Root CalculatorSquare root, cube root and any n-th root
- Slope CalculatorSlope, angle and line equation from two points
Geometry
Trigonometry
Statistics
- Average CalculatorThe average (mean) of any list of numbers
- Mean, Median, Mode CalculatorMean, median, mode and range of a data set
- Sample Size CalculatorHow many people to survey for reliable results
- Standard Deviation CalculatorSample and population standard deviation, with working
- Z-Score CalculatorZ-score and percentile for any value
Probability & Random
- Coin TossFlip a coin online — heads or tails
- Dice RollerRoll any number of dice online
- Love CalculatorA just-for-fun love match test by name
- Password GeneratorStrong random passwords, made in your browser
- Probability CalculatorCombine the chances of two independent events
- Random Number GeneratorPick random numbers in any range
Number Systems
Grades
- Attendance CalculatorYour attendance %, and how many classes to attend or skip for 75%
- CGPA to Percentage CalculatorConvert CGPA to percentage for CBSE, GTU, VTU, AKTU and more
- GPA CalculatorWork out your SGPA, CGPA or 4.0 GPA
- Grade CalculatorYour weighted grade, and what you need on the final
- Marks Percentage CalculatorYour percentage from subject-wise marks, including best of five
- Percentage to CGPA CalculatorConvert your percentage to CGPA on a 10-point scale
- SGPA to CGPA CalculatorCombine your semester SGPAs into an overall CGPA
Guides
All guides- StudentsHow to Convert CGPA to Percentage (CBSE, VTU, AKTU, GTU and More)Every board and university's formula, a ready conversion table, and which number to put on job and admission forms.5 min read · Updated 10 October 2026
- StudentsThe 75% Attendance Rule: How Many Classes Can You Miss?The quick formula for classes to attend or skip, worked examples, and what to do if you fall short.5 min read · Updated 10 October 2026
- StudentsHow to Calculate Marks Percentage (All Subjects and Best of Five)The formula, a worked Class 10 example with all six subjects and the best five, and how to handle papers with different totals.4 min read · Updated 10 October 2026
- NumbersLakh, Crore, Million and Billion: How the Indian Number System ConvertsHow lakhs and crores line up with millions and billions, the Indian comma style, and quick mental conversions.4 min read · Updated 10 October 2026
- NumbersHow to Calculate Percentage Increase and DecreaseThe percentage change formula with everyday examples, how to add or remove a percentage, and why a 20% fall needs a 25% rise to recover.4 min read · Updated 10 October 2026
- StudentsSpeed, Distance and Time: Formulas, Conversions and Exam TricksThe three formulas, unit conversions, why average speed isn't the simple average, and how to solve train and relative speed problems.5 min read · Updated 10 October 2026