51 free tools
Stuck on a slope problem, or sanity-checking a spreadsheet figure before it goes out? That is the exact gap these free math and algebra calculators fill. The Slope Calculator and Slope Intercept Calculator handle linear equations, the Square Root and Cube Root Calculators take care of radicals, and the Scientific Notation Calculator tames numbers too large or too small to type comfortably. Enter your values, get the answer — no account, nothing to install.
The sequence and growth tools cover the other half of a typical algebra course. The Arithmetic Sequence and Geometric Sequence Calculators find any term or sum from a starting value and a common difference or ratio, the Exponential Growth Calculator projects compounding quantities, and the Proportion Calculator solves for the missing value in a ratio. Students use these to check homework line by line, teachers use them to build answer keys, and plenty of adults use them to verify a formula before it lands in a report.
One number worth internalizing: percentage change always divides by the original value. That asymmetry means a 50% drop needs a 100% gain just to break even — run both directions through the Percentage Change Calculator and watch it happen.