16 mm is about 0.630 inches, or about 5/8 inch (slightly more). Divide millimeters by 25.4, because 1 inch is defined as exactly 25.4 mm.
16 mm ≈ 5/8″
Slightly more than 5/8″ (by 0.13 mm) · ≈ 0.63 in
- Inches
- ≈ 0.6299 in
- Nearest 1/16″
- 5/8″ 16 mm is 0.13 mm longer
- Nearest 1/32″
- 5/8″ 16 mm is 0.13 mm longer
- Nearest 1/64″
- 5/8″ 16 mm is 0.13 mm longer
How big is 16 mm?
16 mm = 16 ÷ 25.4 in ≈ 0.62992 in. On a tape measure that is 40/64 in, which reduces to 5/8 in (0.625 in, 15.875 mm), and 16 mm is longer than that by 0.125 mm, about the thickness of a sheet of paper. In other metric units, 16 mm is exactly 1.6 cm and exactly 0.016 m.
Compared with other common fractions: 9/16 in is 14.2875 mm, so 16 mm is about 1.71 mm more; 11/16 in is 17.4625 mm, so 16 mm is about 1.46 mm less.
Things that are about 16 mm
These are nominal sizes. Real parts vary a little with the maker, so check the part when fit matters.
An M16 bolt
The “M16” label means a thread diameter of 16 mm. A standard hex head M16 bolt takes a 24 mm wrench.
A 16 mm drill bit
A standard metric bit size. The closest fraction bit, 5/8 in, drills a hole 0.125 mm smaller.
16 mm film
16 mm film is 16 mm wide, which gave the format its name. It is wider than 8 mm film and narrower than 35 mm film.
A 1 euro cent coin
The 1 cent euro coin is 16.25 mm across, about 0.25 mm wider than 16 mm. A US dime is 17.91 mm across, about 1.9 mm wider.
16 mm panel board
Chipboard, MDF and similar boards are sold in 16 mm thickness. Compared with inch sizes, 16 mm is a little more than 5/8 in (15.875 mm).
Nearby millimeter sizes
Decimals are rounded to 3 places. In the fraction columns, + means the value is slightly longer than the fraction, − slightly shorter, and = exact.
| Millimeters (mm) | Inches (decimal) | Nearest 1/16″ | Nearest 1/32″ |
|---|---|---|---|
| 10 mm | 0.394 | 3/8″ + | 13/32″ − |
| 11 mm | 0.433 | 7/16″ − | 7/16″ − |
| 12 mm | 0.472 | 1/2″ − | 15/32″ + |
| 13 mm | 0.512 | 1/2″ + | 1/2″ + |
| 14 mm | 0.551 | 9/16″ − | 9/16″ − |
| 15 mm | 0.591 | 9/16″ + | 19/32″ − |
| 16 mm | 0.63 | 5/8″ + | 5/8″ + |
| 17 mm | 0.669 | 11/16″ − | 21/32″ + |
| 18 mm | 0.709 | 11/16″ + | 23/32″ − |
| 19 mm | 0.748 | 3/4″ − | 3/4″ − |
| 20 mm | 0.787 | 13/16″ − | 25/32″ + |
| 21 mm | 0.827 | 13/16″ + | 13/16″ + |
| 22 mm | 0.866 | 7/8″ − | 7/8″ − |
Frequently asked questions
How many inches is 16 mm?
16 mm is about 0.630 inches (0.62992 in), or about 5/8 inch, slightly more.
What is 16 mm as a fraction of an inch?
About 5/8 inch. 16 mm is 0.62992 in and 5/8 in is 0.625 in, so 16 mm is slightly more.
Is 16 mm the same as 5/8 inch?
Almost. 5/8 inch is 15.875 mm, so 16 mm is 0.125 mm longer. For most everyday uses they are treated as the same size.
How many cm is 16 mm?
16 mm is exactly 1.6 cm, because 1 cm is 10 mm.
Is 16 mm the same as 3/4 inch?
No. 3/4 inch is 19.05 mm, which is about 3 mm larger than 16 mm.
Can I use a 5/8 inch socket on a 16 mm bolt head?
A 5/8 inch socket (15.875 mm) is nominally smaller than a 16 mm head, so it should not be forced on. Use a 16 mm socket when you have one.
How do I convert mm to inches?
Divide the millimeters by 25.4. For 16 mm, 16 ÷ 25.4 ≈ 0.630 inches.