Ring Size Converter
Convert ring sizes between international standards
Ring Size Chart
| US | UK | EU (mm circ.) | Diameter (mm) |
|---|---|---|---|
| 4 | H | 46.8 | 14.9 |
| 5 | J 1/2 | 49.3 | 15.7 |
| 6 | L 1/2 | 51.9 | 16.5 |
| 7 | N 1/2 | 54.4 | 17.3 |
| 8 | P 1/2 | 57.0 | 18.1 |
| 9 | R 1/2 | 59.5 | 18.9 |
| 10 | T 1/2 | 62.1 | 19.8 |
| 11 | V 1/2 | 64.6 | 20.6 |
| 12 | X 1/2 | 67.2 | 21.4 |
What is This Tool?
Specialized converters handle domain-specific conversions including fuel economy (MPG to L/100km), clothing sizes (shoe, ring), paper sizes (A4, Letter), angle measurements (degrees, radians), and Roman numerals. Each uses its own conversion system specific to its field.
Formula
Fuel: L/100km = 235.215 / MPG
Angles: radians = degrees x pi/180
Roman: I=1, V=5, X=10, L=50, C=100, D=500, M=1000
(subtractive notation: IV=4, IX=9, XL=40, etc.)Worked Examples
1. MPG to L/100km
Given: 30 MPG
L/100km = 235.215 / 30 = 7.84
Result: 7.84 L/100km
2. Degrees to Radians
Given: 180 degrees
radians = 180 x pi/180 = pi
Result: 3.14159 radians
3. Number to Roman Numeral
Given: 2024
2000 = MM, 20 = XX, 4 = IV
Result: MMXXIV
Frequently Asked Questions