Everyday & Math Calculators

Percentage, GPA and everyday math

Three of the most common percentage questions are covered here: finding a percentage of a number (X% of Y), working out what proportion one number is of another, and measuring percentage change between two values. The GPA tool converts letter grades to grade points, weights them by credit hours, and divides by total credits — the standard way schools calculate a grade point average.

Time, units and travel

The hours calculator turns clock-in and clock-out times (minus breaks) into hours and optional pay, handling overnight shifts. The unit converter covers length, weight and temperature, where temperature uses formulas (°F = °C × 9/5 + 32) rather than a fixed ratio. And the speed–distance–time tool rearranges the classic formula, distance = speed × time, to solve for whichever value you're missing.

More tools: Days Between Dates — count the exact days, weeks and business days between any two dates.