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One library. Every calculation.

Math and computer science calculators that show the working

Whether you're checking homework, revising for an exam or converting file sizes at work, pick a calculator, enter your numbers and see each step that leads to the answer, not just the result.

Math tools cover fractions, percentages, algebra, geometry and statistics. Computer science tools handle binary, hexadecimal, data units and transfer times, with short explanations that help the method stick.

Try:

Computer Science0101010101Binary Code

PhysicsE = mc²

Statisticsσ 24.6

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Basic Math

Use our basic maths calculators for percentages, everyday calculations and quick number problems.

Open Basic Math → A

Algebra

Choose a linear, quadratic, simultaneous or polynomial equation solver. Explore exact answers, worked steps and graphs.

Open Algebra → G

Geometry

Calculate rectangle, square, triangle and circle areas with formulas and practical examples.

Open Geometry → N

Networking

Calculate address ranges and plan IP networks without converting every octet by hand.

Open Networking →

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Popular calculators.

Quadratic Equation

Find real and complex roots, the discriminant and vertex.

Open Quadratic Equation → Most popular x,y

System of Equations

Solve two or three equations with exact elimination steps.

Open System of Equations → Most popular xⁿ

Polynomial Equation

Find numerical roots and multiplicities up to degree six.

Open Polynomial Equation → Most popular x≶

Inequality Solver

Solve linear inequalities with exact fractions, interval notation, worked steps and a number line.

Open Inequality Solver → Most popular [A]

Matrix Calculator

Calculate matrix operations, determinants, inverses, RREF and rank, or solve Ax = b.

Open Matrix Calculator → Most popular P(x)

Polynomial Operations and Factoring

Add, subtract, multiply, divide, differentiate and factor polynomials with worked steps.

Open Polynomial Operations and Factoring → Most popular P/Q

Rational Expression Calculator

Simplify and combine polynomial fractions while preserving excluded values.

Open Rational Expression Calculator → Most popular f(x)

Function Calculator

Evaluate functions, create value tables, estimate zeros and calculate compositions.

Open Function Calculator → Most popular log

Exponential and Logarithmic Solver

Solve common exponential and logarithmic equations with domain checks.

Open Exponential and Logarithmic Solver → Most popular √x

Radical Equation Solver

Solve square-root equations and identify extraneous solutions by substitution.

Open Radical Equation Solver → Most popular %

Percentage

Percentage calculator

Open Percentage → Most popular %Δ

Percentage Change

Calculate an increase or decrease relative to an original value.

Open Percentage Change → Most popular %↔

Percentage Difference

Compare two values using their average as the reference.

Open Percentage Difference → Most popular x̃

Mean, Median, Mode and Range

Calculate the mean, median, mode and range of a data set.

Open Mean, Median, Mode and Range → Most popular x̄w

Weighted Average

Calculate an average from values with different weights.

Open Weighted Average → Most popular ∶

Ratio

Ratio calculator

Open Ratio → Most popular ∝

Proportion

Proportion calculator

Open Proportion → Most popular /

Fraction

Fraction calculator

Open Fraction → Most popular 1½

Mixed Numbers

Mixed numbers calculator

Open Mixed Numbers → Most popular aₙ

Arithmetic Sequence

Calculate terms and sums in an arithmetic sequence.

Open Arithmetic Sequence → Most popular rⁿ

Geometric Sequence

Calculate terms and sums in a geometric sequence.

Open Geometric Sequence → Most popular GCF

Greatest Common Factor

Find the GCF of two or more integers.

Open Greatest Common Factor → Most popular LCM

Least Common Multiple

Find the LCM of two or more integers.

Open Least Common Multiple → Most popular pⁿ

Prime Factorization

Write an integer as a product of prime factors.

Open Prime Factorization → Most popular ÷

Divisibility

Check divisibility and calculate the quotient and remainder.

Open Divisibility → Most popular #

Random Number Generator

Generate random integers or decimals within a selected range.

Open Random Number Generator → Most popular ▭

Rectangle

Solve length, width, area, perimeter and diagonal from two known measurements.

Open Rectangle → Most popular □

Square

Solve side, diagonal, perimeter and area from one known measurement.

Open Square → Most popular △

Triangle Area

Area from base and height, three sides or an included angle.

Open Triangle Area → Most popular ○

Circle

Solve radius, diameter, circumference and area from one known measurement.

Open Circle → Most popular △

Triangle Perimeter

Perimeter, semiperimeter and triangle type from three side lengths.

Open Triangle Perimeter → Most popular ⬡

Regular Polygon

Solve a regular polygon's dimensions, area, perimeter and angles.

Open Regular Polygon → Most popular ◿

Right Triangle

Solve a right triangle from two known sides, angles or related measurements.

Open Right Triangle → Most popular △

General Triangle

Solve triangles using SSS, SAS, ASA, AAS or SSA.

Open General Triangle → Most popular ◔

Circle Sector, Arc and Chord

Calculate sector, arc, chord, segment and sagitta measurements.

Open Circle Sector, Arc and Chord → Most popular ⬡

3D Volume and Surface Area

Calculate volume and surface area for common three-dimensional solids.

Open 3D Volume and Surface Area → Most popular ⌁

Irregular Polygon Area

Calculate polygon area, perimeter and centroid from coordinates.

Open Irregular Polygon Area → Most popular ↗

Coordinate Geometry

Calculate distance, midpoint, slope, line and triangle measurements.

Open Coordinate Geometry → Most popular ⏢

Trapezoid

Calculate trapezoid area, perimeter, legs, diagonals and angles.

Open Trapezoid → Most popular ⬭

Ellipse

Calculate ellipse area, circumference, foci and eccentricity.

Open Ellipse → Most popular IPv4

IPv4 Subnet, CIDR and VLSM

Analyse IPv4 networks, convert masks and CIDR prefixes, split subnets and create VLSM address plans.

Open IPv4 Subnet, CIDR and VLSM → Most popular IPv6

IPv6 Subnet Calculator

Expand and compress IPv6 addresses, analyse prefixes, classify addresses and plan numbered /64 LAN subnets.

Open IPv6 Subnet Calculator → Most popular Bandwidth

Bandwidth and Data Transfer Calculator

Calculate transfer time, required bandwidth or transferable data with bit, byte, decimal, binary and throughput-efficiency options.

Open Bandwidth and Data Transfer Calculator →

Why QalcHub

Every answer has a method.
We show you the method.

An answer on its own won't help you in an exam or explain why your file transfer is slower than expected. Each calculator shows the steps it took, the rule or formula it used and where rounding comes in.

Show the working

Follow each step from your input to the answer, then change a value and see how the result changes.

Clear about the rules

Each calculator says which convention it uses, such as 1,000 or 1,024 bytes in a kilobyte, or how many decimal places it rounds to.

Private by design

Calculations run in your browser. The numbers you enter are never stored on our servers.

Calculators for homework, exams and everyday tech

Simplifying a fraction, solving an equation or checking a statistics answer? Converting binary to decimal, or working out how long a 4 GB download will take? Pick a calculator, enter your numbers and get the answer with the steps that lead to it.

The math tools cover fractions, percentages, algebra, geometry and statistics. The computer science tools cover number systems, data units, file sizes and transfer times. Each one includes a short explanation, so you can use the same method yourself next time.

Results are for learning and checking your work. Teachers, exam boards and software can use different rounding, notation or unit conventions, so follow the method you've been asked to use when it matters.