Country chart — India

India ring size chart

The Indian system: plain numbers, with a beautifully simple rule — an Indian size is roughly the inner circumference in millimetres minus 40. Indian 14 means about 54 mm around the inside.

How the Indian system works

Numbers, 1 mm per size

Each Indian size step adds 1 mm of circumference — a finer step than a US half size (about 1.3 mm) and finer than a UK whole letter (about 1.27 mm). That makes Indian sizes precise in theory, but only if the retailer follows the same rule.

The rule: size = circumference − 40

Surat Diamond states it directly, and BlueStone's even-size table follows it exactly (8 → 48 mm, 10 → 50 mm, 12 → 52 mm, and so on). The table below is built from that rule, not from a US conversion.

Even sizes only, in some shops

BlueStone lists only even Indian sizes (8, 10, 12…), while Surat lists every integer. This site lists every integer, because the rule produces every integer — but if a shop stocks only even sizes, round to the nearest even size it stocks, and check the millimetres.

India chart — sizes 8 to 24

India ring size chart, sizes 8 to 24, with inner circumference and diameter.
India size	Inner circumference	Inner diameter
8	48 mm	15.3 mm
9	49 mm	15.6 mm
10	50 mm	15.9 mm
11	51 mm	16.2 mm
12	52 mm	16.6 mm
13	53 mm	16.9 mm
14	54 mm	17.2 mm
15	55 mm	17.5 mm
16	56 mm	17.8 mm
17	57 mm	18.1 mm
18	58 mm	18.5 mm
19	59 mm	18.8 mm
20	60 mm	19.1 mm
21	61 mm	19.4 mm
22	62 mm	19.7 mm
23	63 mm	20.1 mm
24	64 mm	20.4 mm

Warning: Why India is labelled approximate: other published Indian tables do not all follow the −40 rule exactly. One widely republished table gives Indian 7 at 47.1 mm and Indian 8 at 48.7 mm (not 47 and 48), and a third gives different US equivalents for the same Indian size. The differences are ±1 size. This site therefore shows Indian equivalents as approximate and tells you to confirm with the Indian seller's own chart — or, better, give them the millimetre circumference.

Conversion examples

India 12 → about US 6

Circumference 52 mm, diameter 16.55 mm; nearest US row is US 6 (16.51 mm).

India 14 → about US 7

Circumference 54 mm, diameter 17.19 mm; nearest US row is US 7 (17.32 mm).

India 17 → about US 8

Circumference 57 mm, diameter 18.14 mm; nearest US row is US 8 (18.14 mm) — an exact row match.

Original references

No Indian national standard document was freely available to cite directly; the ladder is therefore presented as the Indian retailer rule (Surat Diamond, BlueStone), with its ±1 disagreement documented above, not as a quoted standard.

Related guides

International ring size chart
All systems on one table.
US ring size chart
The number system Indian sizes convert to.
Ring size converter
Convert an Indian size to any other system.