About UtilBear

UtilBear is a set of free online tools: word and character counters, converters for WebP and HEIC images, and 33 calculators covering dates and time, audio production, print sizing, garage work and language-model API costs.

Everything runs on your own device

The tools are web pages with the processing built in. The text you type, the files you pick and the numbers you enter are handled by your browser and never sent to us. There is nothing to install and no account to create. It is also why we cannot recover anything for you: we never receive it. The privacy policy sets out the few things we do count.

How the numbers are produced

Each calculator shows the formula it used, so you can check the result. Where an answer depends on an assumption, the page names that assumption: a tire calculator says it works from the size on the sidewall rather than from a tape measure on a loaded tire, and a reading-time figure says which words-per-minute it used. Where a tool can only estimate, it says so.

How a tool gets added

A tool earns its place here by answering one question completely. Before anything is built, we check what people actually search for and what the existing answers look like: if a search already gives a straight answer, or a well-made free tool already does the job, there is no reason to add a worse copy of it. What is left is usually a calculation people do repeatedly, get wrong in a predictable way, or have to piece together from two other pages.

That filter is why the calculators are grouped the way they are rather than spread across a hundred thin pages. A tire size, a delay time and a bleed margin have nothing in common except the shape of the problem: a small piece of arithmetic with a convention attached, where the convention is the part that catches people out.

Where the numbers come from

The arithmetic is implemented from the definitions rather than copied from other calculators, and it is covered by automated tests that run before anything is published. Where a figure is a convention rather than a law of nature, and the 300 PPI print target, the 200 words a minute reading pace and the three percent tire-diameter rule all are, the page says so and names the assumption instead of presenting it as fact.

Where a result touches something regulated, the page stops. A time card totals hours and separates those above a threshold you choose; it does not decide whether they are overtime. A tire comparison reports a percentage; it does not approve a fitment. That line is drawn on purpose: arithmetic travels, and rules do not.

How UtilBear is maintained

UtilBear is an independent project, built and maintained by one developer. The first tools went online in July 2026, and new ones are added when they are finished rather than on a schedule. Corrections are made as they are reported, and a tool that turns out to be wrong is fixed or removed rather than left up with a caveat.

How it is paid for

The tools are free and there is no paid tier. The site is meant to pay for itself with advertising. If ads are added they will not change what a calculator answers, and where consent is required, for example in the EEA, the UK and Switzerland, you will be asked before any advertising cookie is used.

Corrections

If a result looks wrong, that is worth an email: name the tool and the values you entered so we can try to reproduce it. Write to hello@utilbear.com, or see the contact page.