Guides
Plain-English explainers written and reviewed by the Unit Converter team. No jargon, no filler.
Why the world has two measurement systems
Three countries still hold out against metric. The history is stranger than you think, and the practical advice is simpler than the debate.
5 min read · Reviewed July 2026
Why your 1 TB drive shows only 931 GB
Nobody stole your storage. Drive makers and Windows are counting with different definitions of the same word, and both are technically right.
4 min read · Reviewed July 2026
Fahrenheit, Celsius, Kelvin: why three scales exist
One scale was built on brine, one on water, one on physics itself. Where each came from and the honest case for each.
5 min read · Reviewed July 2026
Cups, grams, and why recipes fail across the Atlantic
A cup of flour can vary by 30% depending on who scooped it. The unit traps hiding in international recipes, and how to bake around them.
5 min read · Reviewed July 2026
The most expensive unit-conversion mistakes in history
A $327 million spacecraft, a jet gliding without fuel, and a 143-year-old bridge — what happens when nobody double-checks the units.
5 min read · Reviewed July 2026
The mental shortcuts for converting units without a calculator
You don’t need to memorize tables. A handful of anchor numbers and rough tricks get you within a few percent for almost anything.
5 min read · Reviewed August 2026
Why “miles per gallon” is a backwards way to measure fuel
MPG hides how much fuel you actually save. The rest of the world uses liters per 100 km for a reason, and the difference changes which car upgrade is worth it.
5 min read · Reviewed August 2026
Pace vs speed: the conversion that trips up every runner
Minutes per mile and miles per hour move in opposite directions. Why pace feels upside down, and how to switch between the two without stopping mid-run.
5 min read · Reviewed August 2026
Why your 300 Mbps internet downloads at 37 MB/s
Nothing’s broken and you’re not being throttled. Internet speed and file size use different units that differ by a factor of eight, plus a little overhead.
5 min read · Reviewed August 2026