Ring sizing guides
Measure on screen or at home
Choose the method that matches what you have: a ring, a finger, a camera, a printer, or just this screen.
How to measure your ring size at home
Five ways to measure ring size at home, ranked by accuracy, plus the calibration step that decides whether any of them actually works.
Read the guideGuideRing size scanner: scan a ring or finger with your phone
Use a ring size scanner correctly: choose ring or finger mode, set a clean reference scale, control light and angle, then verify before ordering.
Read the guideGuideCalibrated on-screen ring sizer
Calibrate this on-screen ring sizer with a payment card, match a ring’s inner opening, and get the closest US, UK and EU size without printing.
Read the guideGuideHow to measure ring size using a ring you already own
The most accurate at-home method: measure the inner diameter of a ring that fits. Here is how to do it on screen, on paper, and with a caliper.
Read the guideGuideHow to measure your finger for a ring size
Measure a finger accurately when you have no ring to copy: the on-screen gauge method, the knuckle test, and when to take the reading.
Read the guideGuideHow to measure ring size without a ring sizer
The string and paper methods explained properly, including the error each one introduces and the fix that makes a phone screen more accurate than either.
Read the guideGuidePrintable ring sizers, and why they so often print wrong
How to use a printable ring sizer without the scaling error that ruins most of them, plus the credit-card check that verifies any printed or on-screen scale.
Read the guideConvert and compare sizes
Look up a measured diameter or circumference, then translate it once into the sizing system a jeweller uses.
Ring size converter
Convert US, UK, EU, Japanese, Chinese and Russian ring sizes. Enter diameter or circumference in millimetres and compare the closest chart sizes for free.
Read the guideGuideRing size chart for US, UK, EU, Japan, China and Russia
The complete international ring size chart with millimetre diameters and circumferences, plus how to read it and which column your seller actually means.
Read the guideGuidemm to ring size: diameter and circumference converted
Turn a millimetre measurement into a ring size. Full diameter and circumference chart, plus how to tell which of the two your number actually is.
Read the guideGuideRing size in inches: inner diameter and circumference chart
Convert a ring’s inner diameter or circumference from inches to US, UK and EU sizes, with a chart and checks that prevent unit mistakes.
Read the guideGuideUS to UK ring size conversion
Convert US ring size numbers to UK letters and back. Full chart from US 3 to 13, plus the half-letter rule that trips most conversions up.
Read the guideGuideJapanese ring size to US conversion
Convert Japanese ring sizes to the nearest US size, then verify the result using inner diameter or circumference before ordering internationally.
Read the guideGuideWomen’s ring size chart for US sizes 3 to 10
Use this women’s ring size chart for US sizes 3–10, millimetre conversions, exact-hand checks, wide-band adjustments and between-size decisions.
Read the guideGuideMen’s ring size chart and how to measure
A men’s ring size chart from US 8 to 13 with millimetres, plus how width, profile and knuckle shape affect the fit test before ordering.
Read the guideGuideAverage ring size for women and men
See retailer-reported common ring sizes for women and men, what sales data can and cannot show, and why an average is not a personal measurement.
Read the guideSolve fit problems
Account for wide bands and larger knuckles before a technically correct measurement becomes an uncomfortable ring.
Wide band ring sizing: when to test a larger size
Wide bands can feel tighter at the same size. Learn why exact width and interior profile matter, and how to test adjacent sizes before ordering.
Read the guideGuideRing sizing when your knuckle is bigger than your finger
Measure the joint and finger base, test the finished ring’s width and profile, and learn which stabilising options a jeweller can assess.
Read the guideSize a specific finger or ring type
Account for the finger being measured and the fit behaviour of smart rings and top-heavy signet rings.
Ring size by finger: thumb, index, middle, ring and pinky
Learn why every finger needs its own ring-size measurement, with practical fitting advice for thumb, index, middle, ring and pinky rings.
Read the guideGuideSmart ring size guide for a secure, comfortable fit
Choose a smart-ring size with the correct model-specific kit, a full-day wear test and fit checks that protect comfort and sensor contact.
Read the guideGuideSignet ring sizing guide for pinky, ring and index fingers
Measure a signet ring for the intended finger, then account for its broad face, tapered shank, knuckle clearance and tendency to rotate.
Read the guidePlan a purchase or proposal
Choose a size discreetly, check an engagement-ring decision, or preview how a design looks on a hand.
How to find her ring size without her knowing
Eight ways to get an engagement ring size secretly, ranked by how accurate and how risky each one is, plus what to order when you still are not sure.
Read the guideGuideEngagement ring size guide
How to get an engagement ring size right when you only get one attempt: secret measuring, what to order if you cannot, and the resize questions to ask first.
Read the guideGuideVirtual ring try-on: see a ring on your own hand
How AI virtual try-on works, what it can and cannot tell you about a ring, and how to shoot a hand photo that produces a genuinely useful preview.
Read the guide
Measure it instead of reading about it
Get Ring Sizer for iPhone or Android. Measure ring sizes, convert between systems and save your measurements.