From quick percentage and fraction checks to geometry, statistics, algebra and basic circuit math — this is the toolbox for students, teachers, and anyone who wants an answer with the working shown, not just a number. Every calculator here explains the formula it uses so you actually understand the "why", not just the "what".
Our most-used math tool — find a percentage of a number, work out percentage change, or reverse-solve for the original value.
Open calculator →Percent of, percent change, reverse percentage.
LiveAdd, subtract, multiply, divide fractions.
LiveSimplify any ratio to its lowest terms.
LiveRaise any base to any power.
LiveSquare and n-th roots of a number.
LiveLog base 10, natural log, or any base.
LiveStandard ↔ scientific notation.
LiveRound to a set number of sig figs.
Circumference, area, diameter, radius.
LiveMultiple shapes: square, rectangle, triangle, circle.
LiveCube, box, cylinder, sphere and cone.
LiveFind any side of a right triangle.
LiveBetween two points on a coordinate plane.
LiveSlope, angle, and line equation.
Mean, median, mode and range.
LivePopulation and sample standard deviation.
LiveSingle and combined event probability.
LivenPr and nCr for any n and r.
LiveGreatest common divisor & least common multiple.
Yes — every calculator on YogiCalc is completely free, with no login, sign-up, or download required.
Yes — each one shows the working and formula used, so you can check the steps and actually learn the concept.
They're great for checking your own work. As with any tool, follow your school or exam's policy on calculator use for graded work.