Ring sizing FAQ
Find answers about measuring a ring or finger, using the online ring sizer, and choosing a size that fits.
Measure My Ring is a free online ring sizer. After you calibrate your screen with a real object, you place a ring you already own over an adjustable circle to estimate its inner diameter and find the closest India, US, UK, and EU sizes. It works in your browser without an account or photo upload.
Choose a ring that fits the finger and hand you are sizing. Calibrate your screen with a bank card, ruler, or item of known dimensions. Place the ring flat on the display and adjust the circle until it matches the ring’s inside edge. The tool then shows its inner diameter and the closest standard sizes. Compare the result with the seller’s size chart before ordering.
For the most reliable finger measurement, use a physical ring sizer or ask a jeweler to measure the finger and check that the size passes comfortably over the knuckle. If you only need a starting estimate, you can rest your finger lightly on this tool’s calibrated screen and match the circle to its width at the base. Finger width on a screen cannot fully account for your knuckle or preferred fit.
The result is an estimate, not a guaranteed fit. Accuracy depends on careful screen calibration and matching the circle to the ring’s inner edge. Screen zoom, device rotation, band width, and differences between jewelers’ charts can affect the size you need. For an expensive, custom, or non-resizable ring, confirm the size with a jeweler.
A standard bank card gives the tool a real-world size reference, so the circle on your screen can be shown at the correct physical scale. You only hold the card against the screen; the tool does not read or collect card details. You can use a ruler or another item with known dimensions instead.
Yes. Open Measure My Ring in your phone’s browser, calibrate that screen, and place the ring flat over the circle. Set the phone on a stable surface and remove a thick case if it keeps the ring or calibration item from lying flat. Recalibrate if you zoom or rotate the screen. The slider and buttons can help on a small display.
You can rest your finger lightly on the calibrated screen and adjust the circle to roughly match its width at the base, but this is only a starting estimate. A physical ring sizer or jeweler can measure your finger and account for your knuckle and the fit you prefer.
US sizes use numbers and half sizes, UK sizes use letters, and EU sizes are commonly based on inner circumference in millimeters. The same ring has different labels in each system. This tool shows the closest US, UK, EU, and India sizes alongside its measured inner diameter; use that millimeter measurement with the seller’s chart because conversions can vary.
Yes. Fingers can swell or shrink with temperature, activity, and other daily changes. If you are measuring your finger, check it more than once at a comfortable room temperature and choose a size that passes over the knuckle without being too loose at the base. An existing ring should be one that fits comfortably at different times of day.
Keep the measured inner diameter in millimeters and compare it with the seller’s chart and available half sizes. The best choice depends on the band’s width, your knuckle, and how snugly you like it to fit; wider bands may feel tighter. Ask the seller or a jeweler for sizing advice before ordering a ring that cannot be resized.
Borrow a ring they already wear on the intended finger and hand, if you can do so without disrupting them. Measure its inside edge with this calibrated tool, record the inner diameter in millimeters, and return the ring. A ring worn on another finger may have a different size. If you cannot borrow one, ask someone close to them or choose a ring that the seller can resize or exchange.