Free online number tools: convert bases, check primes, calculate percentages and averages, and generate sequences. No sign-up, runs in your browser.
| Tool | Category | Action |
|---|---|---|
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2:1 Aspect Ratio Calculator
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Number Tools | Open |
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21:9 Aspect Ratio Calculator
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Number Tools | Open |
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9:16 Aspect Ratio Calculator
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Number Tools | Open |
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Area of a Circle Calculator
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Number Tools | Open |
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Area of a Parallelogram Calculator
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Number Tools | Open |
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Area of a Rectangle Calculator
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Number Tools | Open |
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Area of a Right Triangle Calculator
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Number Tools | Open |
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Area of a Square Calculator
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Number Tools | Open |
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Area of a Triangle Calculator
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Number Tools | Open |
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Area of an Equilateral Triangle Calculator
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Number Tools | Open |
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Average Calculator
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Number Tools | Open |
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Base32 to Base36 Converter
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Number Tools | Open |
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Base32 to Decimal Converter
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Number Tools | Open |
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Base32 to Octal Converter
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Number Tools | Open |
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Base36 to Decimal Converter
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Number Tools | Open |
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Base36 to Hexadecimal Converter
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Number Tools | Open |
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Base36 to Octal Converter
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Number Tools | Open |
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Bayes Theorem Calculator
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Number Tools | Open |
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Binary Calculator
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Number Tools | Open |
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Book Spine Width Calculator
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Number Tools | Open |
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China Time Zones Overview
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Number Tools | Open |
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Circle Area Calculator
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Number Tools | Open |
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Conditional Probability Calculator
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Number Tools | Open |
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Crochet Yarn Estimator
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Number Tools | Open |
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Cross Stitch Fabric Calculator
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Number Tools | Open |
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Dart Calculation (Sewing)
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Number Tools | Open |
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Decimal to Fraction Converter
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Number Tools | Open |
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Factor Finder
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Number Tools | Open |
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Fibonacci Sequence Generator
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Number Tools | Open |
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Fraction Calculator
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Number Tools | Open |
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Fraction to Decimal Converter
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Number Tools | Open |
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Gold Purity Calculator
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Number Tools | Open |
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Hyperfocal Distance Calculator
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Number Tools | Open |
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Karat to Gold Percentage Converter
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Number Tools | Open |
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Knitting Gauge Calculator
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Number Tools | Open |
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LCM and GCD Calculator
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Number Tools | Open |
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Logarithm Calculator
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Number Tools | Open |
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MOA to Mil Converter
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Number Tools | Open |
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Modulo Calculator
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Number Tools | Open |
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Moving Truck Size Calculator
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Number Tools | Open |
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Number Base Converter
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Number Tools | Open |
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Octal to Binary Converter
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Number Tools | Open |
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Octal to Decimal Converter
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Number Tools | Open |
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Octal to Hexadecimal Converter
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Number Tools | Open |
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Pattern Scaling Calculator
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Number Tools | Open |
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Percentage Calculator
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Number Tools | Open |
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Percentage Change Calculator
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Number Tools | Open |
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Perimeter of a Circle Calculator
|
Number Tools | Open |
Showing 1–48 of 65 tools
Number tools are browser-based calculators and converters for working with numeric values — converting between number bases, checking primes, finding averages, and generating sequences. Everything here runs locally in your browser, so the numbers you enter never leave your device and nothing here needs an account or sign-up.
The Number Base Converter switches a value between binary, octal, decimal, and hexadecimal in one step. The Percentage Calculator works out percentages, increases, and decreases without the manual arithmetic. The Average Calculator returns the mean of any list of numbers you paste in. The Prime Number Checker tells you whether a number is prime and lists its factors when it is not. The Roman Numeral Converter turns Arabic numbers into Roman numerals and back.
For longer equations and word problems, see the Math Calculators. To convert between units of measure, see the Unit Converters, and for working with data sets there are the Statistics Tools.