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Calculators and tools
for every task.

Hydrometer temperature correction, baker's percentage, macro depth of field: each with a tool that does the arithmetic and a page that explains the formula.

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What you type stays on your device. 362 of our 369 tools run entirely in your browser, with no account and no upload.

Categories

Productivity across disciplines.

From data to design, each category curates a focused kit of tools, calculators and converters.

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Business

Business tools for the operational numbers a small business runs every week: average order value, customer...

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Drink

Drink tools for the proportions behind what ends up in the glass: scaling a recipe from a single serving to a...

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Development

Development tools for the small utilities that show up on every engineer's desktop and never feel important...

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Design

Design tools for color work, icon and asset preparation, depth-of-field math for photography that crosses...

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Construction

Construction tools for the estimation work that comes before any project: square footage and material...

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Budgeting

Budgeting tools for the money math that comes up between paydays: splitting a bill and tip across a table,...

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Cooking

Cooking tools for the math you actually run into in a kitchen: scaling a recipe up or down, swapping volume...

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Finance

Finance tools that compute the standard numbers you would otherwise build in a spreadsheet: loan and mortgage...

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Unit Conversion

Unit conversion tools for turning a measurement expressed in one unit into the same quantity in another,...

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Discover

What people are using.

Trending

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#1

ICO Converter

Packs PNG, JPEG, GIF, BMP, or WebP source images into a single multi-resolution ICO file with selectable 16, 32, 48, 64, 128...

Design
#2

Dummy Text Generator

Builds placeholder text by sampling words from Lorem Ipsum or a custom source to a target word or character count.

Text
#3

TRIZ Contradiction Matrix and Inventive Principles Tool

Looks up TRIZ inventive principles in Altshuller's 39 by 39 contradiction matrix from a chosen improving and worsening parameter pair.

Productivity

ZPL Label Generator

Renders imported or pasted ZPL II code, including .

Business

Token Calculator

Counts tokens in pasted text with OpenAI's o200k_base byte-pair tokenizer, exact for GPT-4o and newer and approximate for other providers.

Development

PDF Combiner

Merges PDFs and images into one PDF in the browser, splitting every source PDF into pages that can be reordered, rotated, or...

Design

Popular

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#1

Screen Size Calculator

Find the exact screen dimensions, pixel density (PPI), and ideal viewing distance based on screen resolution, aspect ratio, and size with this...

Technology
#2

Leather Thickness Converter

Convert leather thickness between ounces, millimeters, inches, and irons.

Materials
#3

Whitespace Formatter Tool

Improve text readability in large blocks of text or code by removing extra whitespace, standardizing heading formats, applying text transformations, and preserving...

Text

Randomize Text Lines Tool

Shuffles lines of text using Fisher-Yates, with optional Line Groups (1 to 100) that shuffle whole blocks while preserving internal order.

Text

Text to Binary Converter

Converts text to binary and back using UTF-8 (8-bit bytes) or UTF-16 (16-bit code units, with surrogate pairs for characters above the...

Encoding & Decoding

Structured Text to Markdown Converter

This tool formats basic structured text blocks from a Word document into clean, consistent Markdown based on a predefined schema.

Development
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