Precalculus Calculators and Reference Charts
Pre-Calc.com
A compact precalculus calculator page for filling values into common formulas in algebra, trigonometry, counting, and matrices.
Calculators
Permutations and Combinations
Use nCr when order does not matter. Use nPr when order matters.
Formula Output
Quadratic Formula
Uses $ax^2+bx+c=0$ and fills values into the quadratic formula.
Solver Output
2x2 Matrix System
Solves $ax+by=e$ and $cx+dy=f$ with determinants.
Solver Output
Right Triangle: SOH CAH TOA
Enter two sides, or one side plus one acute angle.
Solver Output