Student Math Toolkit

Calculate percentages with this free online percentage calculator: X% of Y, what percent X is of Y, percent increase or decrease and percent difference.

Add, subtract, multiply and divide fractions and mixed numbers online free with steps. Free online fraction calculator that simplifies and converts decimals.

Solve ratios and proportions (A:B = C:?), simplify ratios like 12:18 or 1.5:2.25, and split an amount in a ratio with this free online ratio calculator.

Round numbers to the nearest whole, tenth, hundredth, ten or thousand, with the reason shown. Free online rounding calculator with banker's rounding too.

Solve long division step by step with the full written working, remainders or decimal answers and repeating decimals. Free online long division calculator.

Calculate square roots, cube roots and any nth root with this free online square root calculator, with simplified radical form like √72 = 6√2.

Calculate powers and exponents with this free online exponent calculator: exact big numbers like 2^100, negative exponents as fractions and fractional powers.

See a multiplication table chart up to 20 × 20 and practise times tables 1–12 with a free online quiz — score, streaks and missed facts to review.

Solve ax² + bx + c = 0 with step-by-step working: discriminant, real or complex roots, vertex and axis of symmetry. Free online quadratic formula calculator.

Find the slope between two points as a fraction and decimal, plus the line equation y = mx + b, distance, midpoint and angle. Free online slope calculator.

Find the least common multiple (LCM) and greatest common factor (GCF) of two or more numbers with this free online calculator, with prime factorization.

Find the prime factorization of any number with steps, check if a number is prime, list all divisors and prime numbers. Free online prime factor calculator.

Calculate logarithms in any base with this free online log calculator: log base 10, natural log (ln), log base 2, antilog and change of base.

Convert numbers to scientific notation and back with this free online converter. Get decimal, E-notation and engineering notation, and round to sig figs.

Calculate matrix determinant, inverse, RREF, rank, multiplication and powers with exact fractions and row-operation steps. Free online matrix calculator.

Use a free online scientific calculator with sin, cos, tan, log, ln, powers, roots, factorial and π. Degrees or radians, keyboard input and calculation history.

Find the missing side of a right triangle with this free online Pythagorean theorem calculator, plus angles, area, perimeter and exact square-root answers.

Calculate a circle's area, circumference, diameter and radius from any one value. Free online circle calculator with the formulas A = πr² and C = 2πr.

Calculate the volume of a cube, box, cylinder, sphere, cone, pyramid and more with this free online volume calculator — in litres, gallons, m³ and ft³.

Calculate the average of any list of numbers, plus median, mode, range and sum, or a weighted average. Free online average calculator with steps shown.

Calculate standard deviation, variance, mean, median, mode and quartiles online free. Free online standard deviation calculator for sample or population data.

Calculate z-scores, percentiles and normal probabilities, or the z for a probability like 95%, with this free online z-score calculator and bell curve.

Calculate permutations (nPr) and combinations (nCr), with or without repetition, and list every arrangement. Free online calculator with formulas shown.

Calculate percent error between a measured and true value with this free online percent error calculator, plus percent difference and percent change.

Count significant figures and round to any number of sig figs with this free online sig fig calculator, with decimal, scientific and E-notation results.

Calculate your GPA online free on the 4.0 scale: semester, weighted (Honors/AP) and cumulative GPA with credit hours. Free online GPA calculator.

Calculate your weighted class grade online free and find what you need on your final exam. Free online grade calculator with letter grades and test scores.