Math Calculators

Convert a decimal to a fraction in lowest terms, reading the digits exactly rather than guessing a near one.

Convert a fraction to a decimal by long division, with the repeating block marked and measured.

Percentage difference, change and error side by side — because they are three different answers.

Simplify a ratio to lowest terms and split a total by it — two terms or three.

Solve a/b = c/d for any missing term, with both cross products shown.

Standard deviation, variance and the coefficient of variation from one list — sample or population, the switch that changes all three.

Mean, median and mode together — because all three are called the average — plus the range they say nothing about.

Count the significant figures in a number and round to any number of them, with the ambiguous cases flagged.

Greatest common factor — also called the greatest common denominator, GCD or HCF — with every prime factorisation shown.

Break a single number into its prime factors, with the exponent form, every divisor, and how many there are.

Least common multiple of any set of whole numbers, showing where their multiples first meet.

Two points in, the whole line out — slope, equation, both intercepts and the angle of inclination.

The distance between two points in exact radical form, with every step of the substitution shown — in 2D or 3D.

Roots, discriminant and vertex — including the complex roots most calculators refuse.

The decimal, and the simplified radical form a phone will not give you.

Raise a number to any power, including the negative exponents that give reciprocals and the fractional ones that give roots.

Quotient, remainder and the written working, one digit at a time.

Radius, diameter, circumference or area — enter any one and get the other three, with both circumference formulas shown.

Area, perimeter and diagonal — or a missing side from any one of them.

Area from the parallel sides and height, or the height from all four sides.

SSS, SAS, ASA, AAS and the ambiguous SSA case — and it names the triangle isosceles, equilateral or right.

Volume in litres and gallons, curved wall and total surface area — or the radius a tank of known capacity needs.

Curved and total surface area, and exactly one third of its cylinder — with the slant height kept separate from the height.

Surface area and volume from any one of four measurements, each direction a closed form.