How to Measure Your Ring Size at Home

Before you start

A few small things affect how accurate a home measurement turns out to be. Measure later in the day rather than first thing in the morning — fingers are typically at their smallest when you wake up and swell slightly as the day goes on. Room temperature matters too: cold hands run smaller, so give your hands a few minutes to warm up if you've just come in from outside. And avoid measuring right after exercise or a very salty meal, both of which cause temporary swelling that can throw the result off.

Method 1: String or paper strip

1. Cut a thin strip of string, ribbon, or paper about 6 inches (15cm) long — something with no stretch works best.
2. Wrap it snugly around the base of the finger you'll wear the ring on. Snug is the goal, not tight; it should slide over your knuckle without much resistance.
3. Mark the point where the strip overlaps itself with a pen.
4. Lay the strip flat and measure the distance from the start to the mark using a ruler, in millimeters. That number is your finger's circumference.
5. Match that circumference against a US, UK, or Japan size chart, or use the converter below to skip the lookup.

Method 2: Measure a ring that already fits

If you have a ring you already wear comfortably on the correct finger, this is usually the most reliable home method, since there's no risk of pulling the string too tight or too loose. Lay the ring flat on a ruler and measure straight across the inside edge, from one inner wall to the opposite inner wall — that's the internal diameter. We built a dedicated tool for this exact method.

Method 3: Printable ring sizer

If neither of the above feels precise enough, a printable sizer strip gives you a purpose-built tool: print it at actual size, cut it out, and wrap it around your finger the same way as the string method, but with size markings already printed on it.

Common mistakes to avoid

• Measuring first thing in the morning, when fingers are at their smallest — this is the single biggest cause of a ring feeling tight later.
• Pulling the string or paper too tight, which shrinks the measurement and leads to a ring that won't fit over the knuckle.
• Using a stretchy material like elastic or yarn, which gives an inconsistent reading.
• Forgetting to account for a wide band — a 7mm+ band typically needs to be sized up slightly compared to a thin band of the same labeled size.
• Measuring only once. Take two or three measurements on different occasions and go with the most common result.

What to do if you're between two sizes

Size up rather than down. A ring that's a touch loose can usually be resized smaller fairly easily and inexpensively; a ring that's too tight often can't be resized larger at all, especially with eternity bands, channel-set stones, or certain alternative metals. If it's a comfort-fit band with a domed inner edge, you may not need to size up at all — comfort-fit styles tend to run slightly larger than a flat band at the same labeled size.