You can measure your ring size accurately at home in under five minutes — no jeweller required. There are two reliable methods: measure the inside diameter of a ring that already fits the right finger, or wrap a thin strip of paper around the finger and measure its length (the circumference). Either number converts straight to your US and UK size with the tool below. US sizes run from about 3 to 13.5, and each half-size adds roughly 0.4 mm to the inside diameter — small differences matter, so measure carefully.
This is the complete guide to ring sizing — how to measure at home, the full US/UK/international conversion chart, men's versus women's sizing, why band width changes the fit, and the common mistakes to avoid. Use the interactive tool to find your size now, and the chart and guides below to double-check it.
Key Takeaways
- Measure your ring size at home in two ways: the inside diameter of a ring that fits, or the circumference of your finger with a paper strip — then convert with the tool below.
- US sizes run from about 3 to 13.5, with each half-size adding roughly 0.4 mm to the inside diameter.
- Measure at the end of the day when fingers are warmest and largest, and take the average of two or three tries.
- Wider bands (4 mm+) fit more snugly — size up a half size for comfort.
- Women's sizes typically fall between 5 and 8; men's between 9 and 14.
- Satéur Gems® rings are measured on the same standard scale as any fine ring, so a normal ring sizer applies.
How to Measure Your Ring Size at Home
What's the most accurate way to measure at home? Two methods, both reliable. The ring method is the most accurate if you already own a ring that fits the right finger: measure straight across the inside of the band, edge to edge, in millimetres — that's the inside diameter. The string or paper method works when you don't: wrap a thin strip of paper or a piece of string snugly around the base of the finger, mark where it overlaps, and measure the length in millimetres — that's the circumference.
A few rules make either method accurate. Measure at the end of the day, when fingers are at their warmest and largest; cold fingers can read a full size small. Take the measurement two or three times and average it, and make sure the band can still slide over your knuckle. Enter your number in the sizer below — it converts your measurement to your US and UK size using the official Satéur chart and recommends a fit.
Satéur Ring Sizer
Find Your Ring Size
Measure a ring that already fits, or wrap a strip of paper around your finger — enter the millimetres and we'll convert it to your US and UK size using the official Satéur chart, with a fit recommendation.
Measure straight across the inside of the band, edge to edge.
Measure at the end of the day, when fingers are warmest and largest — and take the average of two or three tries.
View the full size chart
| US | UK / AU | Diameter | Circ. |
|---|
Numbers follow the official Satéur ring-size chart. EU / ISO sizes correspond to the circumference in millimetres.
Explore in depth:
Ring Size Chart: US, UK & International Conversions
How do ring sizes convert between systems? The chart below is the official Satéur ring-size chart: it maps each US size to its UK / Australian letter and gives the exact inside diameter and circumference in millimetres. Find your measured diameter or circumference, and read across for your size. (For EU / ISO sizing, the circumference in millimetres is your size — e.g. a 51.9 mm circumference is an EU 52.)
| US | UK / AU | Diameter (mm) | Circumference (mm) |
|---|---|---|---|
| 3 | F | 14.0 | 44.1 |
| 3.5 | G | 14.4 | 45.4 |
| 4 | H | 14.8 | 46.6 |
| 4.5 | I | 15.2 | 47.9 |
| 5 | J | 15.6 | 49.3 |
| 5.5 | K | 16.0 | 50.5 |
| 6 | L | 16.45 | 51.9 |
| 6.5 | M | 16.9 | 53.1 |
| 7 | N | 17.3 | 54.5 |
| 7.5 | O | 17.7 | 55.7 |
| 8 | P | 18.2 | 57.1 |
| 8.5 | Q | 18.6 | 58.2 |
| 9 | R | 19.0 | 59.3 |
| 9.5 | S | 19.4 | 60.9 |
| 10 | T | 19.8 | 62.3 |
| 10.5 | U | 20.2 | 63.4 |
| 11 | V | 20.6 | 64.9 |
| 11.5 | W | 21.0 | 66.2 |
| 12 | X | 21.4 | 67.5 |
Explore in depth:
Men's vs Women's Ring Sizing
Do men's and women's rings use a different scale? No — the sizing scale is identical; only the typical range differs. Women's ring sizes most often fall between a US 5 and 8, with 6 to 6.5 the most common. Men's sizes typically run from a US 9 to 14, with 10 to 10.5 the most common. The average ring size for women centres around a 6 to 7; for men, around a 10. These are starting points for a surprise gift, not substitutes for measuring — finger size varies far more than the averages suggest.
If you're buying as a surprise and can't measure directly, a few tricks help: borrow a ring she already wears on the right finger and measure its inside diameter with the tool above, or trace the inside circle on paper. Note that a ring worn on a different finger won't transfer — every finger sizes differently. When in doubt, the deeper sizing guides below cover how to estimate, and sizing up slightly is safer than down, since a too-small ring won't go on at all.
Explore in depth:
Why Ring Width & Fit Matter
Why does the same finger need a different size in different rings? Band width. A wide band covers more of the finger and fits more snugly than a thin one, so for a wide band — roughly 4 mm and up — you should size up a half size for comfort. A thin band (under 3 mm) fits true to your measured size. This is why a ring that measured perfectly as a thin sizer can feel tight as a wide wedding band: the measurement was right, but the width changed the fit.
Comfort-fit bands (gently rounded on the inside) also fit slightly more generously than flat-profile bands, so they can run a touch large. And remember that fit changes with the day and the weather — fingers swell in heat and after salt or exercise, and shrink in the cold. Aim for a fit that slides on with light resistance and takes a gentle pull over the knuckle to remove. If it spins freely, it's too big; if you have to force it past the knuckle, it's too small.
Sizing Tips & Common Mistakes
What are the mistakes that throw a measurement off? The big three: measuring cold hands (reads small — always measure warm, at day's end), pulling a string too tight (reads small), and forgetting the knuckle (the ring has to pass it, so a large knuckle may need a half-size up even if the base of the finger is slim). Measuring a ring worn on a different finger is another classic error — every finger is a different size, so use a ring from the same finger you're sizing for.
A couple more: don't measure right after exercise, a hot bath or a salty meal, when fingers are swollen; and if you land squarely between two sizes, go up rather than down — a slightly loose ring can be padded or resized, while a too-small one simply won't wear. For a true surprise, an inexpensive plastic ring sizer or a printable paper sizer (linked above) confirms the number before you order.
Satéur Gems® Ring Sizing
Does a Satéur Gems® ring size any differently? No — Satéur rings are measured on the same standard scale as any fine ring, so any normal ring sizer or the tool above applies directly. Satéur Gems® are set in 18K gold finishing, so a ring is sized and worn exactly as you'd expect of a fine gold piece, with the restrained, white brilliance of a fine diamond and the durability for everyday wear.
One quiet advantage of the diamond-look value: getting the size right is lower-stakes than with a five-figure mined ring. If a gift lands a size off, the modest price — from $138 — makes an exchange painless rather than agonising, and the deeper sizing guides above help you get it right the first time. Measure carefully with the tool, double-check against the chart, and order with confidence.
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Frequently Asked Questions
How do I measure my ring size without a professional sizer?
Two ways. Measure the inside diameter (across the inside, edge to edge, in mm) of a ring that already fits the right finger, or wrap a thin strip of paper around the base of the finger, mark the overlap and measure its length in mm. Enter either number in the tool above to convert it to a US, UK or EU size. Measure warm, at the end of the day, and average two or three tries.
What is the difference between men's and women's ring sizes?
The scale is identical — only the typical range differs. Women's sizes most often fall between a US 5 and 8 (6 to 6.5 most common); men's between a US 9 and 14 (10 to 10.5 most common). Use the averages only as a starting point for a surprise; finger size varies far more than the averages suggest, so measure whenever you can.
Why does ring width affect the size I should order?
A wider band covers more of the finger and fits more snugly, so for a band of about 4 mm and up you should size up a half size for comfort. A thin band (under 3 mm) fits true to your measured size. This is why a finger that measured perfectly with a thin sizer can feel tight in a wide wedding band.
Should I size up or down for wider band rings?
Size up. For any band roughly 4 mm wide or wider, add a half size to your measured size for comfort. The same applies if you land between two sizes — go up rather than down, since a slightly loose ring can be padded or resized while a too-small ring won't pass the knuckle.
How do I convert my ring size to international standards?
Use the official chart above (or the tool). The US uses numbers 3 to 12; the UK and Australia use letters F to X; the EU / ISO size is simply the circumference in millimetres. Match your measured diameter or circumference and read across.
Can I resize a Satéur Gems® ring after purchase?
Satéur rings are measured on the same standard scale as any fine ring and set in 18K gold finishing, so they size and wear like any fine gold piece. The best approach is to measure carefully with the tool and chart before ordering — and because a Satéur Gems® ring starts at just $138, an exchange is painless if a surprise gift lands a size off.
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