Simple online tools: calculators, converters and utilities for everyday use
Free tools for calculations, conversions, and useful tasks. No signup, everything runs in your browser.
Calculators
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Percentage Calculator
Calculate percentages online free. Find percentage of a number, what percent is X of Y, and percentage increase/decrease.
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Rule of Three Calculator
Calculate proportions with the rule of three. Free online calculator for direct and inverse proportionality problems.
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Average Calculator
Calculate the average (arithmetic mean) of any set of numbers instantly. Free online calculator for grades, expenses, statistics, and data analysis.
Converters
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Temperature Converter
Convert temperatures between Celsius and Fahrenheit instantly. Free online converter for cooking, weather, and science.
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Distance Converter
Convert distances between kilometers and miles instantly. Free online converter for travel planning and navigation.
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Weight Converter
Convert weights between kilograms and pounds instantly. Free online converter for cooking, fitness, and shipping.
Developer Tools
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IBAN Generator
Generate valid IBANs for testing and development. Free online IBAN generator with correct checksum validation (MOD 97-10) for all countries.
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JSON Formatter & Minifier
Format JSON with proper indentation or minify to reduce file size. Free online tool. All processing runs locally in your browser.
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URL Encode & Decode
Encode special characters in URLs or decode encoded URLs. Free online URL encoder/decoder. All processing runs locally in your browser.
Text Tools
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Case Converter
Convert text between different case styles instantly. Adapt variable names, object keys, and identifiers to camelCase, PascalCase, snake_case, kebab-case, UPPER_CASE or lower case with one click.
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Text Counter
Get accurate word count, character count, and other text statistics for your content. Perfect for essays, articles, social media posts, and any writing project.