Free everyday math and randomization helpers
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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.
Category
Math helpers
Access
Free
Data handling note
Math helpers calculate and randomize values in the browser. Keep base values, units, weights, duplicate rules, and sampling assumptions visible when you reuse the result.
Last updated
June 30, 2026
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.
I need percent change: Use Percentage Calculator and confirm the base value.
I need weighted grades: Use Grade Calculator and check weights.
Calculate percentages: Percentage Calculator
Average scores or grades: Average Calculator / Grade Calculator
Featured tools
Best starting points in Math helpers
These tools are surfaced from the category decision guide, so they match the most common tasks before the full list below.
Use this for percent of a number, percent change, and what percent one value is of another.
Next: Write down the base value so the result is not misread.
Processing: Browser-side arithmetic.
Use average for simple lists and grade calculator when weights or final-score scenarios matter.
Next: Confirm weights add up before reading the result.
Processing: Browser-side arithmetic.
Use these when the job is proportional scaling, simplification, or fraction operations.
Next: Keep units visible when a ratio represents real quantities.
Processing: Browser-side arithmetic.
Use these for integer factor work, common denominators, or number theory checks.
Next: Confirm inputs are integers before interpreting factors.
Processing: Browser-side integer math.
Use these when the output is random picks, shuffled lists, grouped items, or repeated test values.
Next: Decide whether duplicates are allowed before generating.
Processing: Browser-side randomization.
- Confusing percent of, percent change, and percentage-point change.
- Leaving grade weights incomplete or above 100 percent.
- Simplifying ratios without keeping the original units visible.
- Generating random output before deciding whether duplicates are allowed.
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All Math helpers
This page groups related tools for easier browsing, while every individual tool page focuses on the specific workflow and output.
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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