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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Perimeter of a Right Triangle Calculator
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Number Tools | Open |
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Perimeter of a Square Calculator
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Number Tools | Open |
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Perimeter of a Triangle Calculator
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Number Tools | Open |
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Perimeter of an Equilateral Triangle Calculator
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Number Tools | Open |
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Pot Odds Calculator
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Number Tools | Open |
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Prime Number Checker
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Number Tools | Open |
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Probability Union Calculator
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Number Tools | Open |
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Proportion Solver
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Number Tools | Open |
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Quadratic Equation Solver
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Number Tools | Open |
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Quilt Binding Calculator
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Number Tools | Open |
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Ratio Calculator
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Number Tools | Open |
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Roman Numeral Converter
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Number Tools | Open |
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Rounding Calculator
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Number Tools | Open |
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Square Root Calculator
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Number Tools | Open |
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Statistics Calculator
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Number Tools | Open |
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SVGA Resolution Reference
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Number Tools | Open |
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Triangle Area Calculator
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Number Tools | Open |
Showing 49–65 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.