Guides
The questions behind the conversions: why two numbers that should match don't, which one a printer, browser or contract means, and how to check it yourself. Each guide links to the tools that do the arithmetic.
- DPI vs PPI: which number the printer actually wants
Two acronyms, one confusion. What each number measures, which one decides how big and how sharp a print comes out, and why changing it in an editor often does nothing at all.
- Mbps vs MB/s: why your download is slower than your plan
A lowercase b and an uppercase B are a factor of eight apart. Add a little network overhead and you have the gap between the speed you pay for and the number on your screen.
- px, rem and em in CSS: when to use each
Three length units, three different reference points. What each one is measured against, how they behave when a reader changes their font size, and a simple rule for choosing.
- US vs UK measurements: gallons, pints, cups and tons
The same names, different sizes. Where American and British units part ways, by how much, and which one a recipe, a fuel figure or a shipping quote is likely to mean.
- Why a 1 TB drive shows 931 GB
Nothing is missing. The box and the computer are counting bytes with two different rulers, and only one of them is labeled honestly.