Quirkulator

Algebra Calculators

10 calculators covering linear, simultaneous and quadratic equations, each with its formula and worked examples.

Algebra Calculators brings together 10 calculators for linear, simultaneous and quadratic equations, including Arithmetic Sequence Calculator, Geometric Sequence Calculator, Linear Interpolation Calculator and Quadratic Equation Calculator.

Every page states its method up front — which formula, which convention, which assumptions — because those choices change the answer, and a calculator that hides them is only pretending to be precise.

All 10 pages compute in your browser: nothing you type is sent anywhere, and results update as you edit. Each one carries worked examples, interpretation bands where a score needs context, and a FAQ answering what people actually ask about that calculation.

The collection is part of Math & Statistics, and every page links to the neighbouring calculations you usually need next.

10 pages in this collection

Arithmetic Sequence CalculatorFind any term of a sequence with a constant difference, and the sum to that point.Cross Multiplication CalculatorCross multiply two fractions to compare them or to solve for a missing term.Geometric Sequence CalculatorFind any term of a sequence with a constant ratio, and whether its infinite sum converges.Linear Equation CalculatorSolve ax + b = cx + d and see where the two sides cross.Linear Interpolation CalculatorEstimate a value between two known points, and see when you have strayed into extrapolation.Proportion CalculatorScale a known pair up or down and check whether two pairs are in true proportion.Quadratic Equation CalculatorSolve ax² + bx + c = 0 and see what the discriminant says about the roots.Simultaneous Equations CalculatorSolve two equations in two unknowns by Cramer's rule, with the determinant as the guide.Sum of Series CalculatorAdd a list of numbers and see the running total, the mean and the cumulative pattern.Unit Rate CalculatorReduce a quantity and a total to a per-unit rate so two offers can be compared.

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