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Math & Science

Scientific calculator, percentages, fractions, equations.

These free online maths calculators cover school, college and everyday sums. Use a scientific calculator, find percentages and marks percentage, convert CGPA to percentage, and work with fractions, ratios and averages. Solve quadratic equations with steps, find LCM and HCF, check prime numbers, get mean, median and standard deviation, and calculate area and volume of shapes. You can also write numbers in words in Indian rupees and convert Roman numerals. Working is shown so you can learn the method.

  • Scientific Calculator — Full scientific calculator with trigonometry, logs, powers, roots, factorial, memory and history — works with your keyboard.
  • Percentage Calculator — Find X% of a number, what percent one number is of another, percentage increase or decrease, and percentage difference.
  • Fraction Calculator — Add, subtract, multiply and divide fractions and mixed numbers with simplified answers and steps. Convert decimals to fractions.
  • LCM & HCF Calculator — Find the LCM and HCF (GCD) of two or more numbers with prime factorisation steps.
  • Prime Number Checker — Check if a number is prime, list its factors and prime factorisation, and list all primes in a range.
  • Quadratic Equation Solver — Solve ax² + bx + c = 0 with discriminant, real or complex roots, vertex, step-by-step working and a graph.
  • Statistics Calculator — Paste a list of numbers to get mean, median, mode, range, variance, standard deviation and quartiles.
  • Number to Words — Convert numbers to words in Indian (lakh, crore) and international (million, billion) formats, cheque-ready rupee wording and Hindi.
  • Roman Numeral Converter — Convert numbers to Roman numerals and back (1 to 3999), with validation and a symbol-by-symbol breakdown.
  • Area & Volume Calculator — Area, perimeter, volume and surface area of 13 common 2D and 3D shapes, with the formula shown.
  • Ratio Calculator — Simplify ratios, solve proportions (A:B = C:x), divide an amount in a ratio and scale ratios up or down.
  • Average Calculator — Find the simple average of a list of numbers or the weighted average of values with weights.
  • CGPA to Percentage Calculator — Convert CGPA to percentage (CBSE × 9.5 or custom), percentage to CGPA, and calculate CGPA from semester SGPAs and credits.
  • Marks Percentage Calculator — Enter marks for each subject to get the total, percentage and CBSE-style grade for every subject and overall.