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. For worked examples and fuller reference notes, use the table of contents at left.

Total n Chosen r

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

Output

a b c

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

Output

a b e

c d f

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

Output

Adjacent Opposite Hypotenuse Angle θ Angle θ₂

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

Output