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Regular Polygon Area Calculator
Regular polygon area = n × side² / (4 × tan(π/n)).
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Regular Polygon Perimeter Calculator
Find a regular polygon perimeter as side count × side length.
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Regular Prism Volume Calculator
Find a prism volume from a regular polygon base and perpendicular height.
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REM to PX Converter
Pixels = REM value × root font size.
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Remove Accents from Text
Remove diacritic marks from Unicode text locally while keeping the original letter order and line breaks.
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Remove Duplicate Lines
Remove repeated lines while retaining first occurrence order.
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Remove Emoji From Text
Segment grapheme clusters and remove clusters matching Unicode extended pictographs, flags, keycaps and emoji presentation sequences.
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Remove PDF Annotations
A PDF without page annotations. Delete page annotation arrays while retaining page text and vector content.
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Remove Punctuation
Remove characters in the Unicode Punctuation category and keep letters, numbers, symbols and whitespace.
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Rent vs Buy Calculator
Compare estimated renting and buying cash costs using home price, financing, ownership expenses, and rent growth.
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Resume builder
Build a plain, one-column resume from your contact details and work history. Review the document, download HTML or use your browser’s Print dialog to save a PDF.
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Reverse Text
Reverse Unicode grapheme clusters, or reverse whitespace-separated words.
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Reverse Words
Reverse the order of whitespace-separated words.
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Reynolds Number Calculator
Reynolds number = density × speed × characteristic length / dynamic viscosity.
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RGB To CMYK Converter
Convert opaque RGB channels to a simple mathematical CMYK percentage model.
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RGB to Hex Converter
Convert RGB channel numbers into a six-digit hexadecimal CSS colour and preview it.
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RGB To HSL Converter
Convert opaque RGB channels into CSS hsl() notation.
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RGB To HSV Converter
Convert opaque RGB channels to hue, saturation and value percentages.
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Rhombus Area Calculator
Find rhombus area as half the product of its diagonals.
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RL Time Constant Calculator
Find the time constant of an ideal first-order RL circuit as L/R.
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