Education & Math

Estimate an AP English Language exam composite from multiple-choice results and three essay rubric scores, with optional custom score cutoffs.

Solve ax² + bx + c = 0 with the quadratic formula, including complex roots and the discriminant.

Instantly check if any integer is prime — up to trillions — using a fast trial division algorithm.

Compute n! for any integer up to 170 — perfect for probability, combinatorics and homework.

Generate the first N Fibonacci numbers — the sequence behind nature, art and financial charts.

Calculate combinations (nCr) and permutations (nPr) for any n and r — the core of counting problems.

Find the greatest common divisor and least common multiple of any two integers using Euclid's algorithm.

Enter three sides and get the area (Heron's formula), perimeter and interior angles for any triangle.

Calculate the exact probability of any dice sum for up to 6 dice with 2–20 sides — no simulation needed.

Reduce any fraction to its lowest terms, get the GCD, and see the exact decimal value in one step. Ideal for homework and lesson prep.

Solve any A:B :: C:X proportion instantly — the classic rule of three used in cooking, chemistry, finance and everyday scaling problems.

Enter any two of voltage, current, resistance or power and get the other two — plus watts — with full working. Great for electronics and DIY.

Paste a job description to get likely technical and behavioural interview questions plus a STAR answer structure to prepare with.