How to Find Your Ring Size? 5 Reliable Methods

Finding your ring size is simpler than it seems. Five minutes, a piece of string or a ring you already wear, and you have your answer. We present five methods here, from the most precise to the quickest, along with the details that truly make a difference.

And if you are still hesitant when placing your order: except for a custom-made piece, we will exchange or resize the ring if the size does not fit. There is no need to worry about getting it wrong.

A ring sizer is a set of sample bands covering all standard sizes. It is the reference tool used by jewellers to measure a finger with precision. Each band is calibrated according to the French standard (sizes 3 to 12, corresponding to the inner diameter in millimetres multiplied by 10, divided by π). You slip the bands on one by one until you find the one that passes over the knuckle without force and turns freely at the base of the finger without sliding off.

The decisive advantage of a ring sizer is that it allows you to test the passage over the knuckle, the critical point often overlooked by flat measurement methods. A ring must clear this point without excessive resistance, then settle comfortably at the base of the finger. A ring sizer also gives you a real sense of how the piece will feel: you can tell whether the band feels tight, whether the metal is comfortable, and whether the width suits you.

Jewellers offer this service free of charge, and it is the most reliable measurement available. If you prefer to stay at home, we can send you a printable virtual ring sizer: simply print it at 100% scale, cut out the bands, and try them on.

Do you already own a ring that fits you well? Measure its inner diameter with a precise ruler, graduated to the millimetre. Place the ring flat, then measure the distance from one inner edge to the other through the centre. This measurement in millimetres roughly corresponds to the ring size divided by 10 and multiplied by π, though the simplest approach is to refer to the conversion chart below.

Please note: this method assumes that the reference ring has the same band width as the one you intend to purchase. A wide band (6 mm or more) often requires half a size up compared to a narrow band (3 mm or less), as it covers a greater surface area of the finger. If your reference ring is narrow and you are considering a wider band, adjust accordingly.

Another limitation: inner diameter can only be measured accurately on a round ring. Rings with an oval or square cross-section will distort the measurement. We recommend using a classic ring with a round band, worn on the same finger.

This is the most common at-home technique. Wrap a non-elastic material, such as thin string, a strip of paper, or sewing thread, around the base of your finger, without pulling tight enough to restrict circulation. Mark the point where the ends meet with a pen, then measure the length between the two marks: this gives you the circumference of your finger in millimetres.

Divide this circumference by 3.14 (π) to obtain the diameter. For example: a circumference of 52 mm divided by 3.14 gives approximately 16.5 mm in diameter, which corresponds to roughly a size 6. Refer to the conversion chart below to refine your result.

The string should be snug but not tight: you should be able to rotate it around your finger. We recommend measuring towards the end of the day, when your fingers have reached their usual volume.

Several mobile applications allow you to measure your ring size by placing an existing ring on the screen. The principle is straightforward: the screen displays circles of increasing diameters, you align your ring over them, and the application detects the size. Convenient, though accuracy depends entirely on how well the screen is calibrated. A poorly calibrated screen can produce an error of a full size.

Printable guides, such as our Mayuri virtual ring sizer, are more reliable, provided you follow two essential rules: print at 100% scale (with no automatic scaling) and verify the calibration using a graduated ruler. Most guides include a 10 cm reference line; measure it before cutting out the bands. If it measures 9.8 cm or 10.2 cm, the scale is incorrect and you should reprint.

The advantage of these methods is convenience: you can measure at home, with no appointment needed. That said, they remain less reliable than a metal ring sizer or a professional measurement taken at a jeweller.

It is, by far, the most reliable method. The jeweller measures your finger using a metal ring sizer, has you try on several sizes, and advises you based on the band width and setting style. If there is one near you, it is the best quarter of an hour you can invest in your purchase.

The service is complimentary in almost all jewellery shops, and there is no obligation to buy. Take the opportunity to try on bands of different widths: you will then know exactly what to order online.

Measuring your finger is not enough: several factors influence the ideal size. The first is band width. A wide band (6 mm or more) often requires half a size up compared to a narrow band (3 mm or less). Why? The wider the ring, the more skin surface it covers, and the less it can flex to accommodate changes in finger volume. A narrow band bends slightly as it passes over the knuckle; a wide band stays rigid.

The time of day also matters. Fingers swell later in the day, in warm weather, after physical activity, or following a salty meal. Always measure in the late afternoon, at room temperature, under normal conditions. A measurement taken first thing in the morning can underestimate your size by half a size.

The knuckle is the critical point of passage. Some people have a knuckle noticeably wider than the base of their finger. The ring must pass over it without force, then settle comfortably at the base. If the knuckle is prominent, favour a size that passes easily, even if the ring turns slightly at the base. A ring that moves a little is far better than one that cannot be removed.

Finally, the setting style influences comfort. A solitaire with high prong setting does not sit the same way as a flat band: the weight of the stone and the height of the setting shift the balance on the finger. A continuous pave adds weight as well. Always try on a ring in a similar style (simple band, solitaire, pave) to confirm your size.

The French system measures finger circumference in millimetres, rounded to the nearest whole number. The American (US) and British (UK) systems use letters or numbers with no direct relationship to the actual dimension. Below is the conversion chart for the most common sizes:

The most common size falls between 52 and 54 for women (US 6 to 6.75) and between 62 and 64 for men (US 9.75 to 10.5). These averages conceal genuine variation: some women wear a 46, others a 60. Take a proper measurement rather than relying on a standard, and please know that for our non-bespoke pieces, we are happy to exchange if the size does not fit.

Three simple habits are all it takes.

Measure at the end of the day, in a calm moment, not after exercise or when your hands are cold: this is when the finger is at its usual volume.

When between two sizes, choose the larger one. A slightly looser ring is worn without a second thought; a ring that is too tight quickly becomes uncomfortable. And it is simpler to reduce a ring than to enlarge it.

Adjust for band width. If your reference ring is 2 or 3 mm wide and you are ordering a bangle between 6 and 8 mm, add half a size. If in doubt, write to us: we will advise you based on the design you have chosen.

Most rings can be adjusted after purchase: the band is stretched or metal is added to size up, or removed to size down. At Mayuri, size adjustment is complimentary within 30 days of receipt.

Technical limitations: some designs are not easily altered. Eternity rings eternity (with continuous pave set stones around 360°) require each stone to be removed and reset, which multiplies the risk of chipping or loss. Rings with very dense pave settings present the same challenge. In these cases, adjustment remains possible but delicate, and may require the ring to be remade in the correct size.

The cost of a size alteration outside the warranty period varies depending on the metal and design: expect to pay between $60 and $180 for a simple 18K gold ring, and more for a pave setting. The best solution, however, is to measure correctly from the start. The five methods presented in this article give you everything you need to order the right size first time.

Would you like to propose with an engagement ring as a surprise, but do not know your partner's size? Several discreet approaches exist: borrowing a ring she already wears on the correct finger, tracing the inner outline on a piece of paper, subtly asking a close friend, or ordering a temporarily adjustable size. We have gathered these methods in a dedicated guide, complete with pitfalls to avoid (such as borrowing a ring worn on the index finger when you are sizing for the ring finger) and solutions if things go wrong, including our complimentary 30-day adjustment.

Ring size is an essential technical detail, but it is just one parameter among many. Choosing an engagement ring also involves the metal (yellow gold, white gold, rose gold, Platinum), the stone (Diamond, Sapphire, Emerald, Ruby), the style (solitaire, pave, trilogy), and the budget. Every decision reflects an intention, a taste, a story. Our ultimate guide to the engagement ring covers these topics in depth: how to choose the stone, which Diamond size to prioritise, what settings exist, how to negotiate the price, and what to check before buying.

Finding your size is simpler than you might think. A professional fitting at a jeweller remains the most reliable method: fifteen minutes, free of charge, and you leave with a confident measurement. If that is not possible, a piece of thread or a ring you already wear will do the job perfectly. Simply measure at the end of the day, and size up if you are between two sizes.

And if the size is still not quite right, there is no need to worry: unless the piece is made to order, we will exchange or resize the ring free of charge within 30 days.