U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
§ 51.1566 - Metric conversion table.
| Inches
| Millimeters (mm)
|
|---|
|
1/8 equals | 3.2
|
|
1/4 equals | 6.4
|
|
1/2 equals | 12.7
|
|
3/4 equals | 19.1
|
| 1 equals | 25.4
|
| 1
1/2 equals | 38.1
|
| 2 equals | 50.8
|
| 2
1/2 equals | 63.5
|
| 3 equals | 76.2
|
| 3
1/2 equals | 88.9
|
| 4 equals | 101.6
|
| 4
1/2 equals | 114.3 |
| Ounces
| Grams
|
|---|
| 1 equals | 28.35
|
| 4 equals | 113.40
|
| 5 equals | 141.75
|
| 6 equals | 170.10
|
| 7 equals | 198.45
|
| 8 equals | 226.80
|
| 9 equals | 255.15
|
| 10 equals | 283.50
|
| 12 equals | 340.20
|
| 14 equals | 396.90
|
| 16 equals | 453.60
|
| 18 equals | 510.30
|
| 19 equals | 538.60
|
| 20 equals | 567.00 |
