About OneKitly
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
1,840 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 1,840 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 placements you can see on tool pages and on articles. The network is Google AdSense: its script loads from pagead2.googlesyndication.com, on those pages only — never on the home page, the hubs or the category pages. Whether those ads are personalised depends on where you are. In the EEA, the United Kingdom and Switzerland, nothing is stored and the ads are not personalised until you answer Google's consent message, which since 19 September 2026 is the only one on this site. Elsewhere no such message is required, and the ads are personalised unless you say otherwise — in the United States, through Google's message for state regulations. Nothing you type into a tool ever reaches the network — it is not sold, not shared, and not used to target advertising.