Ring Size Chart
Finger Scanner Tool
Estimate your Indian ring size from a finger photo or live camera view. Calibrate with a standard bank card, align the guides, and get an easy size estimate in seconds.
What Is the Ring Size Chart Finger Scanner Tool?
The Ring Size Chart Finger Scanner Tool is an easy browser-based estimator designed for people who want a quick idea of their Indian ring size without immediately visiting a jewellery store. You can open your phone camera or upload a clear photo showing your finger beside a known-size reference object. The tool uses the reference width to create a scale, then compares that scale with the width of your finger at the position where a ring normally sits.
For the simplest calibration, use a standard ID-1 bank, debit, or credit card placed flat in the same plane as your finger. The international ID-1 card format is 85.60 mm wide. The scanner lets you drag two gold guides to the card edges and two blue guides to your finger edges. It then creates a visual ring-size estimate and matches it to the nearest Indian size in the 1–26 chart.
Important: this is an estimation tool, not a medical or jeweller-grade measuring instrument. Finger shape is three-dimensional, camera perspective can distort width, and band design affects fit. Use the estimate to narrow your likely size, then verify it with our Indian ring size chart, a physical ring sizer, or a professional jeweller before ordering an expensive or non-resizable ring.
Scan Your Finger and Estimate Indian Ring Size
Place a standard bank card beside the finger, keep both flat at the same camera distance, then drag the guides to the card and finger edges.
Place reference
Put a standard bank card next to your ring finger, flat and parallel to the camera.
Take clear image
Use the live camera or upload a sharp photo with visible card and finger edges.
Drag four guides
Gold to the card edges; blue to the finger edges where the ring will sit.
Estimate size
Click the button below. Your result stays hidden until you request the calculation.
Photo Scale → Finger Width → Ring Size Estimate
The scanner does not claim to identify finger size from pixels alone. It first needs a known-width object in the same photo. That reference converts the on-screen guide distance into millimetres, after which the tool produces an approximate ring-size match.
Width in mm
Size Range
Alignment Guides
Required to Server
Step 1 — It establishes a real-world scale
A photo has pixels, not millimetres. The scanner therefore needs a known-width object. A standard ID-1 payment or identification card is convenient because its nominal width is 85.60 mm under ISO/IEC 7810. When the two gold guides are placed on the card edges, the tool can estimate how many on-screen pixels represent one millimetre at that camera distance.
Step 2 — It measures the visible finger width
The blue guides define the visible width of the finger where the ring will sit. The tool converts that guide distance from pixels to millimetres using the card calibration. This is why the card and finger must be next to each other and at the same distance from the camera lens.
Step 3 — It converts the flat width into an approximate ring diameter
A finger is not a perfect circle. The scanner treats the finger cross-section as an oval for estimation, using a conservative geometric profile rather than assuming that the visible width equals the inside diameter of a ring. That produces an equivalent diameter that can be compared with a standard ring-size table.
Step 4 — It matches the nearest Indian size
Finally, the equivalent diameter is compared with the Indian size chart from size 1 through 26. The closest listed diameter becomes the displayed estimate. Because photo perspective, finger tissue and knuckle shape can change the result, the output should be treated as a starting point rather than a final purchase measurement.
A camera-based finger scanner can be useful for estimating a likely size range, but it cannot reproduce the pressure and three-dimensional fit of a physical jeweller's sizing gauge. Camera angle, lens distortion, shadows, distance mismatch between the finger and reference card, swollen fingers, wide knuckles and ring-band width can each shift the estimate.
For a casual fashion ring, a good photo estimate may be enough to narrow your choice. For engagement rings, wedding bands, platinum rings, eternity rings, tension settings or expensive custom jewellery, verify the size physically before purchase. GIA's professional guidance recommends appropriate finger-sizing gauges and also notes that wider rings require special consideration because they fit differently from narrow bands.
| Indian Size | Inner Diameter | Inner Circumference | Typical Scanner Range |
|---|---|---|---|
| Indian Size 1 | 13.1 mm | 41.0 mm | Women / smaller fingers |
| Indian Size 2 | 13.3 mm | 41.7 mm | Women / smaller fingers |
| Indian Size 3 | 13.7 mm | 42.9 mm | Women / smaller fingers |
| Indian Size 4 | 13.9 mm | 43.6 mm | Women / smaller fingers |
| Indian Size 5 | 14.1 mm | 44.2 mm | Women / smaller fingers |
| Indian Size 6 | 14.5 mm | 45.5 mm | Women / smaller fingers |
| Indian Size 7 | 14.9 mm | 47.1 mm | Women / smaller fingers |
| Indian Size 8 | 15.0 mm | 48.0 mm | Women / smaller fingers |
| Indian Size 9 | 15.4 mm | 49.0 mm | Women / smaller fingers |
| Indian Size 10 | 15.7 mm | 50.0 mm | Women / smaller fingers |
| Indian Size 11 | 16.0 mm | 51.2 mm | Women / smaller fingers |
| Indian Size 12 | 16.4 mm | 51.8 mm | Women / smaller fingers |
| Indian Size 13 | 16.7 mm | 53.1 mm | Unisex range |
| Indian Size 14 | 17.1 mm | 54.0 mm | Unisex range |
| Indian Size 15 | 17.4 mm | 55.0 mm | Unisex range |
| Indian Size 16 | 17.8 mm | 56.3 mm | Men / larger fingers |
| Indian Size 17 | 18.0 mm | 57.0 mm | Men / larger fingers |
| Indian Size 18 | 18.4 mm | 57.8 mm | Men / larger fingers |
| Indian Size 19 | 18.7 mm | 59.1 mm | Men / larger fingers |
| Indian Size 20 | 19.1 mm | 60.0 mm | Men / larger fingers |
| Indian Size 21 | 19.4 mm | 60.9 mm | Men / larger fingers |
| Indian Size 22 | 19.7 mm | 61.9 mm | Men / larger fingers |
| Indian Size 23 | 20.0 mm | 62.8 mm | Men / larger fingers |
| Indian Size 24 | 20.4 mm | 63.8 mm | Men / larger fingers |
| Indian Size 25 | 20.7 mm | 64.7 mm | Men / larger fingers |
| Indian Size 26 | 21.0 mm | 66.0 mm | Men / larger fingers |
Use the exact finger that will wear the ring
Finger sizes differ between hands and between fingers. Do not scan the left ring finger if the ring will be worn on the right hand.
Keep your hand relaxed
Do not spread or squeeze the finger. Place the hand naturally on a flat surface so the base of the finger is clearly visible.
Put the reference card beside the finger
The card and finger should be side by side, not one closer to the camera. A distance mismatch is one of the biggest sources of scale error.
Keep the camera straight above
Photograph from approximately perpendicular to the hand and card. Tilting the phone makes one side look larger than the other.
Align blue guides at the ring position
Measure the base of the finger where the ring will rest, not the widest part of the knuckle. The ring still has to pass over the knuckle, so verify that separately.
The main challenge in measuring anything from a photograph is scale. A finger that appears 120 pixels wide could be small and close to the camera or large and far away. A known-size reference fixes that problem. ISO/IEC 7810 defines physical characteristics for identification cards; the widely used ID-1 format is 85.60 mm × 53.98 mm. This makes an everyday card a convenient calibration reference for an estimation tool.
You do not need to show any sensitive card details. Use the back of an expired, blank, membership-style or non-sensitive card if you prefer. Only the physical edge-to-edge width matters. Keep numbers, names and security details covered. If you choose a custom reference object, enter its real width in millimetres and make sure that dimension is known accurately.
📷 Finger Scanner
Useful when you have a phone, a card and no physical ring sizer. Best for narrowing down a likely Indian size before verifying.
📏 Paper / String Method
Measures finger circumference directly, but paper or string can stretch, twist or be pulled too tightly. Repeat several times.
💍 Jeweller Ring Sizer
Physical gauges account for how a ring passes over the knuckle and how different band widths feel. Recommended for high-value jewellery.
Heat
Warm weather can make fingers swell. Measure when your hands are at a normal comfortable temperature.
Cold
Cold fingers can be narrower than usual and may create an undersized estimate.
Time of Day
Finger dimensions can change during the day. Evening measurements are often more representative for everyday wear.
Dominant Hand
The same finger on opposite hands may not be identical. Always scan the exact hand you will use.
Activity
Exercise, hydration and recent activity can temporarily change how snugly a ring fits.
Band Width
Wide bands have more contact with the finger and usually feel tighter than narrow rings at the same nominal size.
The scanner measures the visible finger width at the intended ring position, but a ring also has to pass over the knuckle. If your knuckle is much wider than the base of your finger, a size that looks perfect at the base can still be difficult to put on or remove. In that situation, compare the scanner estimate with a physical sizing gauge and discuss sizing beads or other fit options with a jeweller.
Wide bands are another special case. GIA's quality-assurance guidance distinguishes between narrow sizing gauges and wide-band gauges because band width changes perceived fit. The scanner therefore shows a wide-band warning rather than pretending that one fixed automatic adjustment is correct for every ring.
Full-eternity rings, tension settings, tungsten, ceramic and some highly detailed rings can be difficult or impossible to resize after purchase. For those styles, treat the camera result as a shortlist and obtain a professional final measurement before ordering.
- Camera will not start: use HTTPS, allow camera permission in the browser, or choose Upload Photo instead.
- Guides are hard to drag: touch the small label or vertical line and move slowly. On mobile, the scanner keeps normal vertical page scrolling outside the guide itself.
- Card appears trapezoid-shaped: retake the photo with the phone directly above. Perspective distortion reduces calibration quality.
- Finger edge is unclear: use bright, even light and a contrasting background. Avoid strong shadows next to the finger.
- Result looks unrealistic: confirm that the gold guides are on the full 85.60 mm card width, not the short edge, and that both finger guides are at the ring position.
- Results vary: take three separate images under similar conditions and compare the estimates. A repeated size is more useful than a single scan.
For the physical reference card, see the official ISO/IEC 7810:2019 identification-card standard. For professional finger and ring sizing considerations, see the GIA Accurate Determination of Finger and Ring Sizes benchmark.
The scanner's camera-width conversion is an estimation method created for this web tool. It should not be interpreted as an ISO or GIA-approved ring-sizing procedure.