Every calculator on this page implements a named, standard relationship: Ohm's law and the power law for circuits, F = ma, KE = ½mv², density as mass over volume, and the logarithmic definition of pH. The formula is displayed with each result, so the tools double as worked examples for homework.
Physics problems rarely ask for the same unknown twice, so the circuit, density, force and energy calculators let you choose which variable to solve for — enter the two you know and the third comes back, with the rearranged formula shown.
The molar mass calculator parses real chemical formulas — parentheses included, like Ca(OH)₂ — against standard atomic weights, returning the molar mass and the percentage composition by element. It's the first step of nearly every stoichiometry problem.
The general unit converter spans length, mass, temperature, pressure, energy and speed with exact conversion factors. Temperature is the special case — Celsius, Fahrenheit and Kelvin are offset scales, not simple multiples — and it's handled correctly.