Body metrics, unit conversions and a QR code — four small tools for the figures you look up and immediately forget.
Some calculations are not decisions, they are lookups: how many stone is 78 kilograms, what is 180 °C in Fahrenheit, what does a BMI of 27 mean. These come up often enough that doing them by hand is a waste, and rarely enough that you never remember the conversion factor. That is exactly the shape of task a browser tool fits.
BMI Calculator returns the index, the band it falls into, and the healthy weight range for your height — the last being more useful than the number itself, because it tells you what would have to change. Metric and imperial are both accepted, and the bands shown are the WHO ranges, not a regional variant.
Calorie Calculator estimates daily energy needs from age, sex, height, weight and activity level using the Mifflin-St Jeor equation, then adjusts for a goal: lose, maintain or gain. It also returns a protein target, since the common failure mode of a calorie deficit is losing muscle along with fat.
Both are estimates with a known margin of error, and both say so on the page. BMI in particular is a population measure that says very little about an individual athlete, and the tool does not pretend otherwise.
Unit Converter inverts the usual pattern. Instead of picking a source unit and a target unit, you type one value and every relevant unit updates together. Length, weight, volume and temperature are separate groups, and the whole set stays visible, which is how you notice that 5 km is 3.1 miles and 5,000 metres without doing it twice.
Most QR generators are free because the code points at their redirect domain, which lets them count scans — and lets them switch the destination or expire it. QR Code Generator encodes your link directly, so the code contains the URL itself. Nothing is uploaded, no account is involved, and the code keeps working for as long as the link does. Download as SVG for print or PNG for a screen.
They are small, static pages with no server cost behind them — the calculation happens on your device, so there is nothing to meter. A single paid option exists for people who want every tool unlocked without the upgrade prompt; nothing here is held back behind it.
No, and the tool says so. BMI was designed for populations, not individuals. It overstates risk for muscular people and understates it for older adults who have lost muscle mass. It is a rough screening number, not a diagnosis, and it says nothing about where fat is stored, which is what actually correlates with risk.
Mifflin-St Jeor, which is the current standard for estimating resting metabolic rate and is more accurate than the older Harris-Benedict equation. Activity multipliers are applied on top, then the goal adjustment. Real-world accuracy is roughly plus or minus 10%, so treat the figure as a starting point to adjust from, not a target to hit exactly.
No. The URL is encoded directly into the code rather than pointing at a redirect, so there is no service in the middle that can expire, break, or start charging. The code works as long as the destination link does, and no scan data is collected because there is nothing collecting it.
Everything on this site is free. All-Access removes the upgrade prompt and unlocks every tool.