Roxish is a free collection of 66 fast, no-nonsense calculators for school, work, money, health, and everyday decisions. Every tool gives the answer instantly and shows the formula, a worked example, and the reasoning behind it. Search above or browse the categories below.
Popular calculators
GPA CalculatorPercentage CalculatorCompound Interest CalculatorBMI CalculatorAge CalculatorUnit Converter
School & Grades
Work out grades, GPA, and test scores, with the formula behind every result.
GPA CalculatorHigh School GPA CalculatorCollege GPA CalculatorWeighted GPA CalculatorFinal Grade CalculatorGrade Needed CalculatorGrade Percentage CalculatorLetter Grade Calculator
Percentage & Math
Percentages, averages, roots, logs, and more, each shown step by step.
Percentage CalculatorPercentage Increase CalculatorPercentage Decrease CalculatorFraction to Decimal CalculatorRatio CalculatorAverage CalculatorScientific CalculatorExponent CalculatorRoot CalculatorLog CalculatorPercent Error CalculatorRounding CalculatorLCM CalculatorGCF CalculatorStandard Deviation CalculatorMean, Median, Mode, Range CalculatorRandom Number GeneratorQuadratic Formula CalculatorCombination and Permutation CalculatorSlope Calculator
Geometry
Area, perimeter, and the classic shape formulas, explained clearly.
Circle CalculatorPythagorean Theorem CalculatorTriangle Area CalculatorRectangle Calculator
Finance & Interest
Compound interest, loans, savings, and yield, with growth tables you can read.
Compound Interest CalculatorSimple Interest CalculatorInvestment CalculatorLoan Payment CalculatorAPY Calculator
Health & Fitness
BMI, calories, body fat, and pace, as quick informational estimates.
BMI CalculatorBMR CalculatorCalorie CalculatorIdeal Weight CalculatorBody Fat CalculatorRunning Pace Calculator
Conversions
Switch between metric and imperial units for length, weight, volume, and temperature.
Unit Converterkg to lbs Convertercm to inches ConverterMiles to km ConverterCelsius to Fahrenheit Converter
Date & Time
Count days, find your age, add or subtract dates, and more.
Age CalculatorDate Duration CalculatorBusiness Days CalculatorDue Date CalculatorTime Duration CalculatorCountdown CalculatorWeeks Between Dates CalculatorDate Calculator (Add or Subtract)Day of the Week Calculator
Money & Work
Everyday money math: discounts, tax, tips, margins, salary, and unit price.
Discount CalculatorSales Tax CalculatorTip CalculatorMargin CalculatorMarkup CalculatorSalary CalculatorHourly to Salary CalculatorROI CalculatorUnit Price Calculator