Math Calculators
Scientific, statistical, and calculus · 18 free tools
Free Math Calculators for Students
14+ free math calculators: percentage, fraction, algebra, quadratic equation, scientific, statistics (mean, median, mode, standard deviation), ratio and proportion, LCM and HCF, geometry (area, perimeter, volume) and unit conversion. No signup, runs in your browser. Useful for CBSE, ICSE and state board students from class 6 to 12, and for competitive exam prep like JEE, NEET and SSC.
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Percentage Calculator
Find X% of a number, percentage increase, percentage decrease, and percent difference — all in one tool.
Scientific Calculator
A full scientific calculator in your browser — trig in degrees or radians, logarithms, powers, roots, factorials, and memory keys with proper order of operations.
All Math Calculators
Fraction Calculator
Add, subtract, multiply & divide fractions.
Quadratic Equation
Solve ax² + bx + c = 0.
Statistics Calculator
Mean, median, mode, and std deviation.
Probability Calculator
Calculate event probability.
LCM & GCD Calculator
Find LCM and GCD of two numbers.
Logarithm Calculator
Calculate log base any.
Trigonometry
sin, cos, tan for any angle.
Binary Converter
Convert between binary, decimal, hex.
Ratio Calculator
Simplify and scale ratios.
Average Calculator
Mean of multiple numbers.
Factorial Calculator
Calculate n! for any number.
Prime Number Checker
Check if a number is prime.
Power / Exponent
Calculate base^exponent.
Square Root
Find square & cube roots.
Random Number Generator
Generate fair, unbiased random numbers in any range you choose — both endpoints included. Perfect for raffles, giveaways, games, sampling, and quick decisions.
Percentage Change Calculator
Find the percentage increase or decrease between two numbers, with the direction of change and the exact difference shown instantly.
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How to Use These Math Calculators
Math calculators are most useful when you treat them as a check on your own working, not a replacement for it. Solve the sum on paper first, then verify with the calculator and read the step-by-step output to spot where you went wrong.
Tips for Accurate Results
For percentage problems, be clear whether you want X percent of Y, percentage increase, percentage decrease, or X as a percent of Y. Each gives a different formula. For class 10 and 12 board exam practice, write the steps in your answer sheet even when the final number matches the calculator.
For fractions, always reduce to lowest terms before final answer. For algebra and quadratic equations, double-check signs of coefficients before entering them. A common mistake is forgetting that ax squared plus bx plus c equals 0 uses b with its own sign (positive or negative).
For statistics, decide whether you need sample standard deviation (n minus 1 in denominator) or population standard deviation (n in denominator). For LCM and HCF, prime factorisation method is more reliable than guesswork for larger numbers.
For geometry, watch the units. Area in square cm cannot be added directly to area in square m without conversion (1 square m equals 10,000 square cm).
Real-World Example
Rohit is in class 10 CBSE and preparing for the board exam. He uses the quadratic equation solver to verify his answers from RD Sharma and NCERT exercises. The percentage calculator helps him work out his predicted overall percentage based on his unit test scores. The LCM HCF tool checks his factor tree work in chapter 1. For trigonometry chapter, he uses the scientific calculator to verify sin, cos and tan values for standard angles.
Accuracy and Limitations
Results are accurate for the formulas used and inputs you provide. These calculators do not show every intermediate algebraic step a teacher might expect in a board exam answer sheet, so always learn the method, not just the answer. For doubts, refer to NCERT textbooks or ask your maths teacher. These tools are educational aids and do not replace classroom learning.