Roxish is a free collection of 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, so you can trust the number and understand where it came from.
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
Why Roxish
Most calculator sites either bury a simple tool under heavy pages and pop-ups, or give you a bare number with no explanation. Roxish takes the opposite approach. Each page loads fast, works on any phone or computer, and puts the calculator first. Below it you will always find the exact formula, a worked example with real numbers, a plain-language explanation of how to read the result, and answers to the questions people actually ask. The goal is not just to compute, but to help you understand.
How Roxish works
Every calculation runs entirely in your browser. The numbers you type are never sent to a server or stored, so the tools are private and instant. The large majority of our calculators are built on well established, textbook formulas, from grade point averages and percentages to compound interest, body mass index, and unit conversions. Where a result depends on an assumption, such as a grading scale, a compounding frequency, or an activity level, we state that assumption clearly on the page so there are no surprises.
Who Roxish is for
Students checking a grade or solving math homework, workers figuring out margins, salaries, and deadlines, savers planning with compound interest, and anyone who needs a quick, reliable answer in everyday life. The tools are designed to be simple enough for a first-time visitor and detailed enough to be genuinely useful, with large text and clear controls that work well for every age.
Frequently asked questions
- Are the calculators free to use?
- Yes. Every calculator on Roxish is completely free, with no sign-up required.
- Do you store the numbers I enter?
- No. Calculations happen in your browser and your inputs are not sent to or saved on any server.
- How accurate are the results?
- The tools use standard formulas and aim for accuracy, but results are estimates based on your inputs and should be verified before any important decision. They are not professional financial, medical, tax, or academic advice.
- Can I suggest a calculator?
- Yes, please use the contact page to request a new tool or report an issue.