You don't need a jeweler's sizing kit to get a workable ring size at home — a strip of paper or string and a ruler will get you close enough for most fashion rings.
Quick answer
Wrap a thin strip of paper or string snugly around the base of your finger, mark where it overlaps, measure that length in millimeters, and compare it to a standard ring-size chart to convert to a US size. Do this at the end of the day when fingers are at their largest, not first thing in the morning. If you'd rather skip measuring entirely, several Wrenfield rings — including the Modern Metal Cross-Opening, Star, and Sunflower styles — use an adjustable open-back design that fits a range of sizes without needing an exact number.
Step by step
- Cut a thin strip of paper (or use a piece of string) about 4 inches long.
- Wrap it around the base of the finger you'll wear the ring on, snug but not tight.
- Mark where the end overlaps the start.
- Lay the strip flat and measure the marked length in millimeters — this is your finger's circumference.
- Compare that number to a standard ring-size conversion chart to find your US size.
Common mistakes that throw off the result
- Measuring first thing in the morning. Fingers are typically smaller then than later in the day, which can give a size that's too tight once you're up and moving.
- Pulling the strip too tight. This undersizes the same way a too-tight waist measurement does — snug, not compressed.
- Measuring a cold hand. Cold temperatures shrink fingers slightly; measure at normal room temperature.
When to skip measuring entirely
Adjustable open-back rings — several styles in Wrenfield's lineup use this design — have a small gap that lets the band flex to fit a range of finger sizes. These are a genuinely practical choice if you're buying as a gift and don't know the recipient's size, or if you just want to skip the measuring step.
FAQ
Is the paper-strip method as accurate as a professional sizer?
It's close enough for fashion jewelry, though a jeweler's metal sizer is more precise for fine jewelry with less room for error.
My finger size seems different between hands and different fingers — is that normal?
Yes, this is completely normal. Measure the specific finger you plan to wear the ring on, not a different one.
The bottom line
The paper-strip method takes two minutes and gets you a workable size for fashion rings, or skip it entirely with an adjustable style. Browse the Rings collection to see which styles come in fixed sizes versus adjustable.