Free Printable Guide
Ring sizing goes wrong more often than any other part of buying jewellery
Almost always for the same reason: the measurement was taken once, at the wrong time of day, on the wrong hand. Fingers on your dominant hand run up to half a size larger, and the same finger changes size between morning and evening.
This guide gives you three measuring methods, a printable strip, and — more usefully — the conditions that change the answer.
What is inside
- Three measuring methods — a printable strip, measuring a ring you already own, and the string-and-ruler fallback, with the mistake that ruins each one
- A circumference-to-US-size conversion table covering sizes 3 through 12
- The five factors that change the answer: time of day, temperature, knuckle size, band width, and season
- A resizing-possibility table by ring type — because eternity bands, tension settings and tungsten cannot be resized at all, which changes how carefully you need to measure
- How to buy as a surprise without asking
- Fit diagnostics — how to tell too tight from too loose from correct, and what to do if a ring is stuck
The one rule most people miss: never use thread or elastic to measure. Anything with stretch reads small, and that is the single most common cause of a ring that will not go past the knuckle when it arrives.
Get the guide
Prefer to skip the form? Download the guide directly (PDF).
General guidance only. Home measurement is an estimate; for engagement rings, heirloom pieces or anything that cannot be resized, have the finger measured by a professional jeweller. Some settings — eternity bands, tension settings, and certain gemstone or inlay designs — cannot be resized after manufacture. Confirm the resizing and returns policy before ordering, and consult a jeweller about antique or treated pieces.