Math & Education

Spell out numbers in English words — US or UK style, lakh/crore for South Asia — plus cheque-writing format with cents, for any number up to the quadrillions.

Convert numbers to Roman numerals and Roman numerals back to numbers (1–3,999), with validation of properly formed numerals.

Every percentage question in one place: X% of Y, X is what percent of Y, percentage change, percentage difference, and increasing or decreasing by a percent.

Convert obtained marks into a percentage — for a single exam or a whole result card with several subjects.

Calculate your GPA on a 4.0 scale from letter grades or grade points and credit hours — and your cumulative GPA including previous semesters.

Add, subtract, multiply and divide fractions and mixed numbers, with the answer simplified, as a mixed number and as a decimal.

Paste a list of numbers to get the mean, median, mode, range, sum, standard deviation, variance and quartiles instantly.

A free online scientific calculator — type any expression with trig, logs, powers, roots, factorials, constants and unit-aware maths.

Solve linear and quadratic equations in x — typed naturally like 3x + 5 = 2x - 7 or x^2 - 5x + 6 = 0 — with the discriminant, vertex and real or complex roots.

Solve linear inequalities in x like 3x − 5 < 7 or 2(x + 1) ≥ x − 4, flipping the sign correctly, with the answer in inequality and interval notation.

Differentiate any function of x symbolically — polynomials, trig, exponentials, logs and products — and evaluate the derivative at a point.

Compute definite integrals of any function numerically to high precision, and get the exact antiderivative of polynomials — the area under a curve in seconds.

Find the limit of a function as x approaches a number or infinity — checks the left- and right-hand limits and spots infinite limits and limits that don't exist.

Factor polynomials with integer coefficients — common factors, rational roots, difference of squares and irreducible quadratics — and list all the roots.

Solve any triangle from three known values (SSS, SAS or ASA): all sides, angles, area, perimeter and heights, using the law of sines and cosines.

Find the missing side of a right triangle with a² + b² = c² — the hypotenuse from two legs, or a leg from the hypotenuse and the other leg.

Calculate the area and perimeter of 2D shapes (circle, rectangle, triangle, trapezoid, ellipse, hexagon) and the volume and surface area of 3D solids (sphere, cylinder, cone, box, pyramid).

Find the slope, line equation (y = mx + b), distance, midpoint and angle between two points on a coordinate plane.

Get sin, cos, tan, csc, sec and cot of any angle in degrees or radians — with exact values for special angles and the reference angle and quadrant.

Calculate your current course grade from weighted categories — homework, quizzes, midterm, final — and see the letter grade.

Find the score you need on the final exam to get the course grade you want, given your current grade and how much the final is worth.

Turn points earned into a percentage and letter grade — and see the grade for every number of wrong answers on a test.

Curve a set of test scores — raise the top score to 100, add a flat bonus, or scale to a target average — and see each student's new score.

Calculate unweighted and weighted high school GPA — adding 0.5 for honors and 1.0 for AP/IB courses — from letter grades and credits.

Estimate your UK degree classification — First, 2:1, 2:2 or Third — from your module marks and credits and your university's year weightings.

Convert a word count into pages for essays and manuscripts — by font, size and spacing — or find how many words fit on a number of pages.

Estimate the full cost of a degree — tuition, housing, food, books and other costs with yearly increases — minus scholarships, and plan a monthly student budget.

Find the least common multiple (LCM) and greatest common factor (GCF/GCD) of two or more whole numbers, with their prime factorizations.

Check whether a number is prime and find its prime factorization, all divisors, and the nearest primes above and below.

Calculate powers, square/cube/nth roots (with radical simplification like √72 = 6√2) and logarithms in any base.

Simplify ratios like 12:18 to 2:3, scale a ratio to a total, and solve proportions (a:b = c:x) for the missing value.

Convert decimals to simplified fractions (including repeating decimals like 0.333…) and fractions to decimals with the repeating part marked.

Convert numbers to and from scientific notation (e.g. 0.000452 = 4.52 × 10⁻⁴) and engineering notation, with a chosen number of significant figures.

Round a number to any decimal place or number of significant figures — half up, half even (banker's), always up or always down — and count its sig figs.

Multiply, add and subtract matrices, and find the determinant, inverse, transpose and rank — or solve a system of linear equations Ax = b.

Add, subtract, multiply and divide complex numbers, and convert between rectangular (a + bi) and polar form (r∠θ), with modulus and conjugate.

Add, subtract, multiply and divide numbers in binary, octal or hexadecimal, and do bitwise AND, OR, XOR and shifts — exact for large numbers.

Divide whole numbers with long division and see every step — bring down, divide, multiply, subtract — plus the quotient, remainder and decimal answer.

Generate a times table for any number or a full multiplication grid up to 20 × 20 — ready to print or copy.

Calculate permutations (nPr) and combinations (nCr), with or without repetition, exactly — even for very large numbers.

Convert a value to a z-score and percentile from the mean and standard deviation — or a percentile back to a value — using the normal distribution.

Get the p-value for a z-score, t-statistic or chi-square statistic — one- or two-tailed — and check it against your significance level.

Compare the means of two groups with Welch's t-test (or Student's pooled test) from raw data — t-statistic, degrees of freedom, p-value and mean difference.

Calculate a confidence interval for a mean (from raw data or summary statistics) or for a proportion, at 90%, 95% or 99% confidence.

Fit a least-squares line to x,y data: slope, intercept, equation, R², Pearson correlation coefficient r — and predict y for any x.

Find the value at any percentile of a data set, or the percentile rank of a value — using the same method as Excel's PERCENTILE.INC.

Calculate probabilities of two events — both, either, neither and conditional — plus the chance of at least one success in repeated trials.

Generate printable math practice worksheets — addition, subtraction, multiplication, division or mixed — with your own number ranges and an answer key.

Compare grades across Europe, the UK and the US — ECTS A–F, German 1.0–5.0, French /20, Italian /30, Spanish /10, Dutch /10, UK degree classes and US GPA.