Calculators that show their work

Every CalcBadger tool explains its formula, cites the standard it follows, and runs entirely in your browser — nothing you type leaves the page.

Finance

All finance tools

CD Calculator

Work out what a certificate of deposit will be worth at maturity: final balance, total interest, and the effective AP…

Home Improvement

All home improvement tools

Square Footage Calculator

Calculate the square footage of a room or area from its measurements — rectangles, L-shapes, circles, and triangles —…

Construction

All construction tools

Stair Calculator

Lay out a straight run of stairs from the total rise: number of risers and treads, exact riser height in carpenter-fr…

Education

All education tools

SAT Score Calculator

Convert raw scores on a paper SAT practice test into scaled section scores and a 400–1600 total, using College Board’…

Science

All science tools

Molarity Calculator

Convert between mass, molar mass, volume, and molar concentration — solve for molarity, grams of solute, solution vol…