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25 Tools, One Hub

Every maths calculation, one click away.

From scientific and percentage to matrices, quadratics and standard deviation — pick a calculator below and get an instant, worked answer. Nothing is saved to any server.

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Scientific Calculator

Full keypad with trig, log, powers and constants.

 
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Percentage Calculator

What is X% of Y — the most common percentage question.

—result

Formula: (X ÷ 100) × Y

Average Calculator

Enter numbers separated by commas or spaces.

—average

Formula: sum of values ÷ count of values

Ratio Calculator

Simplify a ratio to its lowest terms.

—ratio

Formula: divide both values by their HCF/GCD

Prime Number Checker

Check whether a number is prime.

—prime?

A prime has exactly two divisors: 1 and itself.

LCM Calculator

Least common multiple of two or more numbers, comma separated.

—LCM

Formula: LCM(a,b) = (a × b) ÷ GCD(a,b), extended pairwise for more numbers

HCF / GCD Calculator

Highest common factor of two or more numbers, comma separated.

—HCF

Formula: Euclidean algorithm, applied pairwise across all numbers

Prime Factorization Calculator

Break a number down into its prime factors.

—factors

Repeated division by the smallest prime until only 1 remains

Fraction Calculator

Add, subtract, multiply or divide two fractions.

—result

Result is auto-simplified to lowest terms

Decimal ↔ Fraction Converter

Enter either a decimal (0.75) or a fraction (3/4) — it detects which.

—converted

Fractions auto-simplify; decimals are matched to the closest exact fraction

Linear Equation Solver

Solve ax + b = c for x.

—x =

Formula: x = (c − b) ÷ a

Quadratic Equation Solver

Solve ax² + bx + c = 0.

—roots

Formula: x = (−b ± √(b²−4ac)) ÷ 2a

Log Calculator

Logarithm of a number, to any base.

—log

Formula: log_b(x) = ln(x) ÷ ln(b)

Triangle Calculator

Enter all three sides — area (Heron's formula), perimeter and validity are calculated.

—area

Heron's formula: s=(a+b+c)/2, Area=√(s(s−a)(s−b)(s−c))

Circle Calculator

Enter the radius to get area, circumference and diameter.

—area

Area = πr² · Circumference = 2πr

Area Calculator

Pick a shape, enter its dimensions.

—area

Formula depends on the shape selected above

Volume Calculator

Pick a shape, enter its dimensions.

—volume

Formula depends on the shape selected above

Matrix Calculator

Add, subtract or multiply two matrices (2×2 or 3×3).

Add/subtract: element-wise · Multiply: row × column dot products

Determinant Calculator

Determinant of a 2×2 or 3×3 matrix.

—det

2×2: ad−bc · 3×3: cofactor expansion along the first row

Mean, Median & Mode Calculator

Enter numbers separated by commas or spaces.

Mean = sum ÷ count · Median = middle value (sorted) · Mode = most frequent value(s)

Standard Deviation Calculator

Enter numbers separated by commas or spaces.

—std dev

Sample SD divides by (n−1) · Population SD divides by n

Permutation Calculator (nPr)

Number of ways to arrange r items out of n, order matters.

—nPr

Formula: nPr = n! ÷ (n−r)!

Combination Calculator (nCr)

Number of ways to choose r items out of n, order doesn't matter.

—nCr

Formula: nCr = n! ÷ (r! × (n−r)!)

Probability Calculator

Basic probability of a single event.

—probability

Formula: P(event) = favourable outcomes ÷ total outcomes

Binary ↔ Decimal Converter

Enter a binary number (0s and 1s) or a decimal number — it detects which.

—converted

Binary uses base 2 (place values 1,2,4,8,16...) · Decimal uses base 10