Precalculus Calculators and Reference Charts

Pre-Calc.com

Quick fill-in calculators for common precalculus formulas in counting, quadratics, matrices, and right-triangle trigonometry.

Calculators

These quick tools fill values into standard formulas students search for most often. For worked examples and fuller reference notes, use the table of contents at left.

Slope and Line from Two Points

x₁ y₁ x₂ y₂

Finds slope, the point-slope form, and the slope-intercept form through two points.

Output

Distance and Midpoint

x₁ y₁ x₂ y₂

Uses the distance formula and midpoint formula between two coordinate points.

Output

Permutations and Combinations

Total n Chosen r

Use nCr when order does not matter. Use nPr when order matters.

Output

Quadratic Formula

a b c

Uses $ax^2+bx+c=0$ and fills values into the quadratic formula.

Output

Quadratic Vertex Form

a b c

Finds the vertex, axis of symmetry, and vertex form for $y=ax^2+bx+c$.

Output

2x2 Matrix System

a b e

c d f

Solves $ax+by=e$ and $cx+dy=f$ with determinants.

Output

Right Triangle Solver

Adjacent Opposite Hypotenuse Angle θ Angle θ₂

Enter two sides, or one side plus one acute angle.

Output

Circle Equation from Center and Radius

Center h Center k Radius r

Builds the standard circle equation and expands it into general form.

Output