About

Instrumentize is a collection of small, focused online tools: things you need for two minutes and should not have to install, register for, or read an advertisement-heavy article to reach.

How it is built

Every tool is a page that does one thing. Whatever can be computed in your browser is computed there, which is faster and means the data you paste never travels. Tools that do need the server use a plain form, so they keep working with JavaScript disabled and a result is always a link you can send to someone.

Where the answers come from

Every answer comes from rules written into the tool, so the same input always gives the same result. The rule each tool applies is described on its page, and where a tool follows a published standard — an RFC, an ISO norm, the conversion factors of the SI — that standard is named among its sources.

Nothing is estimated on your behalf. A figure that depends on where you live — a VAT rate, an inflation index, the carbon intensity of a country's electricity — comes from a named source and is shown with it and its date. A figure only you know, such as your energy price or the conversion factor on your gas bill, is left for you to give: no page assumes one.

What happens to what you type

A tool that computes in your browser sends nothing anywhere. The ones that handle figures about you — an income, a debt, a weight — keep them in the part of the address after the #, which browsers never send to a server, so a link to your result can still be shared without the figures reaching anyone's logs.

The privacy page says exactly what is kept and what is not.

What it costs

Nothing, and there is no account to create. The site is paid for by advertising, in slots fixed in size so that nothing moves under your cursor.

Who makes it

Instrumentize is built and maintained by an independent developer. Who publishes it and how to reach them is in the legal notice.

Corrections

These tools are only useful if they are right. If a result looks wrong, it probably is, and the calculation rules behind each tool are documented on its page so you can check them.

To report a mistake, use the contact address in the legal notice.