2026 Ring Size Guide, Measure Your Finger at Home

A ring that is too tight remains at the bottom of a drawer, while one that is too large eventually spins or slips off. Somewhere in between, there is a simple measurement you can take at home in a few minutes without any special equipment: this ring size guide helps you measure your finger with precision.

This guide brings together the three methods we recommend in-store, a French size chart, and the key points that explain most sizing errors when ordering online. The goal is clear: obtain a reliable finger circumference measurement before choosing a piece, whether it is a delicate everyday band or a statement ring.

2026 Ring Size Guide: How to Measure Your Finger at Home

Reading time: ~10 min

1. What does a ring size correspond to in France?
2. Method 1: Measure Your Finger Circumference with a Strip of Paper
3. Method 2: Measure an Existing Ring and Convert the Diameter
4. Method 3: Use a Ring Sizer, Printable or Professional
5. French Ring Size Chart
6. What Time of Day Should You Measure Your Finger?
7. What to Do if Your Ring Size Falls Between Two Sizes
8. Errors That Skew Your Measurement
9. Choosing Your Ring Size Online at Summertime
10. Giving a Ring Without Knowing the Size
11. In Summary
12. Frequently Asked Questions

What Does a Ring Size Correspond to in France?

Inner Circumference: The Basis of the French System

In France, a ring size corresponds to the inner circumference of the ring expressed in millimeters. A size 54 therefore corresponds to an inner circumference of 54 mm, or a finger circumference of approximately 5.4 cm.

This millimeter-based logic is the great strength of the French system: there is no complicated conversion to make, the measurement obtained is directly the size to order. The most common sizes for women are around 52 to 56, but smaller sizes such as 44, 46, and 48 are available on certain models, especially for the pinky finger.

Be careful not to confuse the inner circumference with the inner diameter, which is the width of the ring measured from one inner edge to the other. The diameter of a size 54 is approximately 17.2 mm, which is very different from the size number.

Method 1: Measure Your Finger Circumference with a Strip of Paper

This is the method we recommend first, because it only requires a sheet of paper, scissors, and a ruler graduated in millimeters. Prefer a thin, relatively stiff strip of paper over an elastic string, which skews the measurement by stretching. If you use a piece of twine, choose a non-stretch model and lay it down without pulling it tight.

Here are the steps to follow to measure your finger circumference with a strip of paper or twine.

1. Cut a strip approximately 1 cm wide and 10 cm long.
2. Wrap it around the base of the finger in question, snug but not tight.
3. Slide it up to the joint to check that it passes the second knuckle.
4. Mark the exact spot where the two ends meet with a pen.
5. Unroll the strip and measure the length obtained in millimeters with a ruler.
6. Repeat two or three times and keep the most frequent measurement.

The number obtained corresponds to your French size. A finger circumference of 53 mm gives a size 53, a finger circumference of 57 mm gives a size 57. Be sure to measure the finger on which the ring will be worn, and on the correct hand, because the same finger does not always have the same circumference on the left and right.

Good to Know

The second knuckle is often wider than the base of the finger. If the difference is significant, it is what determines the size to order, otherwise the ring will never pass the joint.

Method 2: Measure an Existing Ring and Convert the Diameter

If you already own a ring that fits comfortably on the target finger, you have your best reference point. Lay it flat on a light surface and measure its inner diameter with a ruler graduated in millimeters, from one inner edge to the other, passing through the center.

Then multiply this inner diameter by 3.14 to obtain the approximate inner circumference, therefore the French size. An inner diameter of 17 mm gives, for example, a circumference of approximately 53.4 mm, or a size 53 or 54 depending on the desired comfort.

Accuracy of the Diameter–Circumference Conversion

This diameter-circumference conversion is simple, but it requires precision: a half-millimeter difference shifts the result by one and a half sizes. Also check that the reference ring resembles the desired model. A wide ring is not worn like a thin band, and measuring a signet ring to order a thin ring, or vice versa, often leads to disappointment.

Method 3: Use a Ring Sizer, Printable or Professional

Professional Ring Sizer and Printable Ring Sizer

A professional ring sizer is a set of calibrated rings of different sizes that you slide on until you find the right fit. It is the most reliable measurement because it takes into account the actual shape of the finger, the passage of the joint, and comfort when worn. Each calibrated ring corresponds to a precise size; you just need to read the number engraved inside.

There are also printable ring sizer versions, to be downloaded and then cut out. The precaution is always the same: print at actual size, at 100 percent, without automatic scaling, then check with a ruler that the control marker measures the stated length. A poorly sized print gives a false measurement from the start.

In our stores in Lyon Croix-Rousse and Mâcon, we measure your finger circumference with a ring sizer in a few seconds, and you can try the models directly.

French Ring Size Chart

The chart below reminds you of the correspondence between the French size and the inner circumference in millimeters, as well as the corresponding inner diameter. It is just as good as a women's ring size chart as a men's ring size chart, as the French system is unique, only the commonly worn sizes differ.

Correspondence between French size, finger circumference, and inner diameter

French size	Finger circumference	Approximate inner diameter
46	46 mm	14.6 mm
48	48 mm	15.3 mm
50	50 mm	15.9 mm
52	52 mm	16.6 mm
54	54 mm	17.2 mm
56	56 mm	17.8 mm
58	58 mm	18.5 mm
60	60 mm	19.1 mm

For wider fingers, the correspondence continues linearly: 62 mm (diameter 19.7 mm), 64 mm (20.4 mm), 66 mm (21.0 mm), 68 mm (21.6 mm), and 70 mm (22.3 mm). The diameters are rounded; they serve as a reference for the existing ring method. You can also find this information on our size guide.

What Time of Day Should You Measure Your Finger?

Fingers do not maintain the same volume throughout the day. The swelling of fingers at the end of the day or after physical activity is common, as is in strong heat or after a salty meal. Conversely, the cold noticeably tightens the hand, and a measurement taken upon returning from outside in winter will result in a size that is too small.

Measure when your hands are at normal temperature, ideally at the end of the day or late afternoon, when the finger is at its usual widest volume. Avoid just after sports, just after a hot bath, or when coming in from the cold. If you hesitate, measure at two different times and compare; this will give you a realistic range rather than an isolated number.

What to Do if Your Ring Size Falls Between Two Sizes

It often happens that the measurement falls at 53.5 mm or 55.5 mm. The general rule is to choose the larger size, so that the ring can be put on and taken off without forcing, especially if the joint is pronounced.

Two nuances deserve to be mentioned. First, the width of the ring, because a wide ring does not feel like a thin band: a wide ring covers more skin surface and appears more fitted, so it is wise to take the size above. Next, the style of wear: a ring worn on the pinky finger or a thin ring intended for a combination of several rings tolerates a very close fit to the finger better.

Errors That Skew Your Measurement

Before confirming your order, review this short list.

• Measuring a cold, very hot, or swollen finger after sports.
• Using an elastic or stretch twine instead of a strip of paper.
• Tightening the strip to the point of marking the skin, which costs a whole size.
• Forgetting to check the passage of the second knuckle.
• Confusing inner diameter and inner circumference.
• Printing a ring sizer without checking the print scale.
• Measuring a finger from the other hand or a ring worn elsewhere.

Choosing Your Ring Size Online at Summertime

Our selection combines designer rings and costume jewelry, with very different materials and constructions. This distinction matters when choosing your size. Models with set stones, continuous patterns, or gold plating are generally not resizable: a non-resizable costume ring must therefore be ordered in the correct size from the start. Thin and delicate rings forgive a slight difference more, while wider pieces require a careful measurement.

When the size remains uncertain, an adjustable ring solves the problem. Our adjustable models, such as the adjustable ring or the XL hammered adjustable ring, adapt to several fingers and move easily from one day to the next. For the pinky finger, our collection dedicated to the pinky finger offers small sizes depending on the available models.

Before any purchase, consult the jewelry return policy of the seller. Ours is detailed on our returns and exchanges page.

Key Takeaways

A measurement taken at the end of the day, checked twice and compared to an existing ring is sufficient in the vast majority of cases. In case of persistent doubt, an adjustable ring or a visit to the store avoids a sizing error.

Giving a Ring Without Knowing the Size

Knowing someone's ring size without asking them requires a little discretion. Borrow a ring they regularly wear on the target finger, measure its inner diameter, or trace its inner contour on a sheet of paper. You can also compare it with one of your own, or ask the opinion of a close friend.

If none of this is possible, opt for a piece without size constraints. A necklace remains the safest solution, for example the Golden Sun necklace in stainless steel at 24 euros, the Trame Mini necklace at 60 euros in 24-karat fine gold-plated brass, or the Vestiges necklace at 80 euros, both designed and handmade in Paris.

In Summary

Measuring your ring size at home boils down to three steps: a strip of paper around the finger, a reading in millimeters, a check with an existing ring. The French system does the rest, since the measurement obtained is directly the size to order.

For the rest, our stores in Lyon Croix-Rousse and Mâcon are open to doubt, trying on, and advice, and the entire selection of rings is also available online.

FAQ

Can a costume ring be resized after purchase?

Rarely. Costume rings featuring plating, set stones, or a continuous pattern across the entire band cannot be resized without damaging the finish. It is better to exchange the piece or turn to an adjustable model.

Should you take the same size for all your rings on the same hand?

No. The index, middle, ring, and pinky fingers have different circumferences, sometimes by several sizes. If you are creating a stack, measure each finger separately.

Does an American or English size correspond to the French size?

No, they are distinct systems. Anglo-Saxon sizes are expressed in numbers or letters and require a conversion table. In France and French-speaking Switzerland, the reference remains the inner circumference in millimeters.

How to know if a ring is the right size once received?

It must pass the joint with slight resistance, turn a little on the finger without slipping, and be removed without prolonged effort. If a red mark appears after a few minutes, the size is too tight.

Does the width of the band really change the feel?

Yes. On a band that is 6 mm wide or more, the surface in contact with the skin is larger and the comfort when worn decreases by one notch. Many wearers then prefer a half size or one size above their usual measurement.