9 free tools

Free everyday math and randomization helpers

Solve practical percentage questions, simplify ratios, calculate fractions, find GCD and LCM, factor integers into primes, calculate averages and grades, generate random numbers, shuffle lists, pick names, and split items into groups for quick everyday checks.

Best for quick arithmetic, classroom checks, ratio and fraction work, common factor lookup, prime factorization, averages, grades, random picks, list shuffling, group making, or sampling you want to finish without opening a spreadsheet.

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Category

Math helpers

Access

Free

Browser-first utility pages

Each listed tool has its own page with focused controls, examples, assumptions, FAQs, and related tools.

Quick answer

Free everyday math and randomization helpers group related browser tools for one practical workflow.

Best for quick arithmetic, classroom checks, ratio and fraction work, common factor lookup, prime factorization, averages, grades, random picks, list shuffling, group making, or sampling you want to finish without opening a spreadsheet.

Open an individual tool page when you need the actual controls, examples, assumptions, FAQs, and related links.

Best inputs

Start with the tool whose title most closely matches the job or output you need.

Use the tool descriptions and notes to decide whether you need a calculator, converter, formatter, generator, or planning helper.

If the workflow branches, use the related tools on each tool page to move to the next step.

Common use cases

This category helps you compare related tools and return to common tasks.

Compare related tools, open the most specific utility for your job, and move between adjacent tasks.

Use this category page as the index; use individual tool pages for task completion.

Common searches in this category

Use these task phrases when you know what you need but not the exact tool name.

percentage calculatorPercentage CalculatorOpen match percent change calculatorPercentage CalculatorOpen match random number generatorRandom Number GeneratorOpen match number pickerRandom Number GeneratorOpen match average calculatorAverage CalculatorOpen match mean calculatorAverage CalculatorOpen match weighted average calculatorAverage CalculatorOpen match grade calculatorGrade CalculatorOpen match weighted grade calculatorGrade CalculatorOpen match final grade calculatorGrade CalculatorOpen match ratio calculatorRatio CalculatorOpen match ratio simplifierRatio CalculatorOpen match simplify ratioRatio CalculatorOpen match fraction calculatorFraction CalculatorOpen match fraction simplifierFraction CalculatorOpen match add fractions calculatorFraction CalculatorOpen match GCD calculatorGCD and LCM CalculatorOpen match LCM calculatorGCD and LCM CalculatorOpen match least common multiple calculatorGCD and LCM CalculatorOpen match prime factorization calculatorPrime Factorization CalculatorOpen match prime factors calculatorPrime Factorization CalculatorOpen match prime factor calculatorPrime Factorization CalculatorOpen match random name pickerList RandomizerOpen match list randomizerList RandomizerOpen match shuffle listList RandomizerOpen match

Available now

Math helpers

Random Number Generator

Generate random numbers, dice rolls, ranges, and sorted lists locally using browser randomness.

List Randomizer

Shuffle lines, pick random items, or split a list into groups locally in your browser.

List shuffle and picks

Average Calculator

Calculate mean, median, sum, minimum, maximum, and range from pasted numbers in your browser.

Quick statistics

Grade Calculator

Calculate weighted grades from scores and category weights without a spreadsheet.

Ratio Calculator

Simplify a two-part ratio and scale it up or down for recipes, design sizes, classroom math, and planning.

Ratio simplifier

Fraction Calculator

Add, subtract, multiply, or divide two fractions and reduce the result to simplest terms in your browser.

Fraction arithmetic

GCD and LCM Calculator

Find the greatest common divisor and least common multiple for a list of integers in your browser.

Prime Factorization Calculator

Break an integer into prime factors and see the factor list and exponent form directly in your browser.

Percentage Calculator

Calculate percentage of a number, percentage change, and what percent one number is of another.

Why this category exists

Best for quick arithmetic, classroom checks, ratio and fraction work, common factor lookup, prime factorization, averages, grades, random picks, list shuffling, group making, or sampling you want to finish without opening a spreadsheet.

This page groups related tools for easier browsing, while every individual tool page focuses on the specific workflow and output.

Frequently asked questions

What can the percentage calculator solve?

It covers percentage of a number, percentage change, and what percent one number is of another.

Can I simplify ratios or calculate fractions?

Yes. The ratio calculator simplifies and scales two-part ratios, and the fraction calculator adds, subtracts, multiplies, or divides two fractions.

Can I find GCD, LCM, or prime factors?

Yes. The GCD and LCM calculator handles lists of integers, and the prime factorization calculator breaks a number into prime factors.

Can I generate random numbers?

Yes. The random number generator supports ranges, multiple outputs, and optional duplicate prevention.

Can I randomize a list or pick names?

Yes. The list randomizer shuffles pasted lines, picks a random subset, and splits items into groups locally in the browser.

Is this category intended to expand?

Yes. It is reserved for practical everyday math utilities that do not need backend processing.

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