🧮 25 free calculators

An interactive 12×12 grid — click a cell, practise, print.

Add, subtract, multiply and divide fractions — with worked solutions.

Work out percentages, percentage increase/decrease, and a percentage of a number.

Pythagoras' theorem for a right-angled triangle — enter 2 sides.

Shows every step of column multiplication, carrying digits and adding the zeros.

Shows every step of long division — quotient, remainder, and bringing down the next digit.

Shows the order step by step: brackets → indices → multiplication and division → addition and subtraction.

Negative numbers, positive numbers and jumps along the line (for Years 1–3).

Highest common factor (HCF) and lowest common multiple (LCM) — with Euclid's algorithm.

Shows a factor tree — for example 60 → 2 × 2 × 3 × 5.

Length, mass, volume, area and time — with the full working shown.

ax + b = c — a guided solution showing every rearrangement.

Full solution of ax²+bx+c=0 with the discriminant and a graph.

Plot functions online: pick a function — get an interactive graph with zoom and pan.

y = mx + c automatically, from (x₁,y₁) to (x₂,y₂).

The gradient between two points (x₁,y₁) and (x₂,y₂), with a graph.

log_b(x) with any base, including ln. Step-by-step working.

Expanding brackets: (a+b)(c+d), (a+b)², (a+b)(a−b) with working.

Work out the perimeter and area of any shape — square, circle, triangle and more.

Cuboid, cylinder, sphere, cone and pyramid — with formulae and a diagram.

n sides → (n−2)·180°. A regular polygon also shows a single interior angle.

sin, cos, tan with a visual unit circle and SOHCAHTOA special values.

Enter a list of numbers — get the mean, median, mode and range.

Solve ratios, find a missing value, and simplify a ratio to its lowest terms.

Exact years, months and days between two dates.