Finger Ring Size Calculator

Find your ring size and convert between US, UK, EU, Japan, India and more.

Finger circumference Wrap a paper strip or string around your finger, mark where it meets, then measure the length.

Unit

Size system

Your ring size UK sizes use letters, e.g. N or N½.

Ring band width Wide bands feel tighter, so they need a slightly larger size.

Fit preference Comfortable is right for most people.

My knuckle is much bigger than the base of my finger

Enter your measurement and tap Calculate Ring Size.

📊 Full size chart

💡 Measuring tips

Measure at the end of the day, when fingers are slightly larger, and at room temperature.
Avoid measuring right after exercise, a hot shower or when your hands are cold.
Use a thin strip of paper or non-stretchy string. Mark where the ends overlap and measure the length with a ruler.
The ring must slide over your knuckle but stay snug at the base of your finger.
Measure 2 to 3 times on different days and use the average.
Already own a ring that fits? Measure its inside diameter (edge to edge across the hole) and use the “Ring diameter” method.

Sizes are estimates and can vary slightly between jewelers. For expensive or custom rings, have a jeweler measure you.

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