About Allin
A single place for the small calculations and conversions everyone needs occasionally — without an account, an install, or a hunt through five sites.
What you will find here
1,820 tools, grouped into seventeen areas — health, finance, maths, text, files, dates, web development and the rest. Each tool is one page that does one thing: a calculator, a converter, a generator, a reference table. No tool asks for an account, and none is a trial version of something else. Two — a DNS lookup and a temporary phone number — need a subscription to run, because they cost us money on every use; they are listed on the Pro tools page. The other 1,820 run for free, with no limit.
Six languages, not one translated five times
Every tool exists in English, French, Spanish, Portuguese, German and Italian. Where a calculation depends on where you are — tax scales, VAT rates, paper sizes, clothing sizes, grading systems, date formats — the tool takes a country, and the answer changes with it. A converter that only knows US customary units is not a converter, it is a US converter.
How the site pays for itself
Advertising, in the reserved placements you can see on tool pages. No advertising network is connected yet, which is why those placements are empty: they hold their space so that connecting one later does not shift the page under your cursor. What a tool receives is used to answer the question you asked it, and for nothing else: it is not sold, shared or used to target advertising.