Where do these numbers come from?
- NISTSP 811 exact unit definitions (1 in = 25.4 mm, 1 lb = 453.59237 g)current edition
- NISTHandbook 44, weights and measurescurrent edition
- King Arthur BakingIngredient Weight Chart (kitchen tools)retrieved Oct 23, 2026
Checked Oct 23, 2026. 1 inch is exactly 25.4 mm (NIST SP 811), so 100 mm ÷ 25.4 = 3.937 in.
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52 mm = 2.0472 in
Worked example
52 ÷ 25.4 = 2.0472 inches. On a ruler marked in sixteenths, that is about 2 1/16″; in thirty-seconds, 2 1/16″; in sixty-fourths, 2 3/64″. The nearest 1/16 mark (2 1/16″ = 52.39 mm) is off by 0.39 mm.
52 mm is also 5.2 cm and 0.171 feet.
| Millimeters | Inches | Nearest 1/16 |
|---|---|---|
| 47 mm | 1.8504 | 1 7/8″ |
| 48 mm | 1.8898 | 1 7/8″ |
| 49 mm | 1.9291 | 1 15/16″ |
| 50 mm | 1.9685 | 1 15/16″ |
| 51 mm | 2.0079 | 2″ |
| 52 mm | 2.0472 | 2 1/16″ |
| 53 mm | 2.0866 | 2 1/16″ |
| 54 mm | 2.126 | 2 1/8″ |
| 55 mm | 2.1654 | 2 3/16″ |
| 56 mm | 2.2047 | 2 3/16″ |
| 57 mm | 2.2441 | 2 1/4″ |
Frequently asked questions
How many inches is 52 mm?
2.0472 inches, about 2 1/16″.
What fraction of an inch is 52 mm?
About 2 1/16″ to the nearest 1/32.