How to find your ring size at home
Two ways to work out a ring size without visiting a jeweler — measure a ring you already own, or measure your finger — plus a US, UK and EU size chart.
Blog
Short, practical guides to measuring things, with and without a ruler.
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How to read a ruler (inches, centimeters and millimeters)
What all the little lines mean on an inch ruler and a metric ruler, with worked examples you can check against the ruler on this site.
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Paper sizes in cm and inches: A4, Letter, A5 and more
The exact dimensions of A4, A5, A3, US Letter, Legal and Tabloid paper in millimeters and inches, plus card and photo sizes, and why A4 has such odd proportions.
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Why on-screen rulers are often the wrong size
Browsers measure in "CSS pixels", not millimeters, so a ruler on your screen can be 10–40% off. Here's why, with real numbers, and how calibration fixes it.
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How to measure your pupillary distance (PD) at home
A simple, reliable way to measure the distance between your pupils with a mirror and a ruler, what a normal PD is, and when to ask an optician instead.
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How screen sizes are measured: TVs, monitors and phones
A "55-inch" TV is measured corner to corner. Here's how to measure a screen yourself, and the real width and height of common TV and monitor sizes in inches and centimeters.
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How to measure something without a ruler
Everyday objects with exact, standard sizes — coins, bank cards, paper and banknotes — that you can use as a ruler when you don't have one.
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How to measure your wrist for a bracelet or watch
Measure your wrist with a strip of paper, then add the right amount of ease for a snug, comfortable or loose bracelet, and check a watch strap fits.
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Screw and bolt sizes explained: M sizes, # sizes and how to measure
What M4, M6 or