Text & Web Tools
Utilities for people who work with words and interfaces. The readability tools implement the real published indices — Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI — and the colour tools apply the proper sRGB gamma step, so contrast ratios match what an accessibility auditor will measure.
Collections in Text & Web Tools
5 groups · 92 pagesCSS Unit Converters34 conversion pages for CSS length units, each with its exact factor, the formula and a reference table.34 calculatorsText & Readability Tools18 calculators covering counting words and scoring readability, each with its formula and worked examples.18 calculatorsWeb Development Calculators15 calculators covering CSS units, viewport maths and aspect ratios, each with its formula and worked examples.15 calculatorsTransfer & Bandwidth Calculators15 calculators covering download time, transfer time and bandwidth needs, each with its formula and worked examples.15 calculatorsColour Calculators10 calculators covering hex, RGB, HSL and contrast ratios, each with its formula and worked examples.10 calculators
All Text & Web Tools calculators
92 focused tools.
Aspect Ratio Resize CalculatorAudio File Size CalculatorAutomated Readability Index CalculatorBackup Window CalculatorBandwidth Requirement CalculatorBase64 Size Overhead CalculatorCharacter CounterCMYK to RGB ConverterColeman-Liau Index CalculatorColour Luminance CalculatorComplementary Colour FinderContrast Ratio CalculatorCss Centimeters to Css Inches ConverterCss Centimeters to Css Millimeters ConverterCss Centimeters to Picas ConverterCss Centimeters to Pixels ConverterCss Centimeters to Points ConverterCSS Grid Column Width CalculatorCss Inches to Css Centimeters ConverterCss Inches to Css Millimeters ConverterCss Inches to Picas ConverterCss Inches to Pixels ConverterCss Inches to Points ConverterCss Millimeters to Css Centimeters ConverterCss Millimeters to Css Inches ConverterCss Millimeters to Picas ConverterCss Millimeters to Pixels ConverterCss Millimeters to Points ConverterDownload Time CalculatorFile Transfer Time CalculatorFlesch Reading Ease CalculatorFlesch-Kincaid Grade CalculatorGolden Ratio Typography CalculatorGreyscale Conversion ToolGunning Fog Index CalculatorHash Collision Probability CalculatorHex to RGB ConverterHSL to RGB ConverterImage File Size EstimatorImage Scale CalculatorIP Subnet Host Count CalculatorKeyword Density CalculatorLetter Spacing CalculatorLexical Density CalculatorLine Height CalculatorModular Type Scale CalculatorParagraph CounterPassword Entropy CalculatorPicas to Css Centimeters ConverterPicas to Css Inches ConverterPicas to Css Millimeters ConverterPicas to Pixels ConverterPicas to Points ConverterPixels to Css Centimeters ConverterPixels to Css Inches ConverterPixels to Css Millimeters ConverterPixels to Picas ConverterPixels to Points ConverterPixels to Quarter-Millimeters ConverterPoints to Css Centimeters ConverterPoints to Css Inches ConverterPoints to Css Millimeters ConverterPoints to Picas ConverterPoints to Pixels ConverterPoints to Quarter-Millimeters ConverterPX to EM CalculatorPX to Percent CalculatorPX to PT CalculatorPX to REM CalculatorPX to VW CalculatorQuarter-Millimeters to Pixels ConverterQuarter-Millimeters to Points ConverterReading Time CalculatorREM to PX CalculatorRequests Per Second CalculatorRGB to CMYK ConverterRGB to Hex ConverterRGB to HSL ConverterSentence CounterSMOG Readability CalculatorSpeaking Time CalculatorStorage Capacity PlannerStreaming Data Usage CalculatorSyllable Count EstimatorText to URL Slug ConverterTint and Shade CalculatorTyping Speed WPM CalculatorUnique Word CounterUptime and Downtime CalculatorVideo File Size CalculatorViewport Breakpoint CalculatorWord Counter