1 mm to inches
Instant conversion for 1 mm — decimal inches, the nearest 1/64 fraction , and how far off common imperial sizes are, using the same engine as the mm to inches hub.
1mm to inches conversion
- Decimal inches
- 0.0394
- Nearest 1/64
- 3/64 in (+0.191 mm)
- Feet + inches
- 0 ft 0.039 in
The inches fraction result is rounded to the nearest 1/64 fraction.
1 millimeter is equal to 0.0394 inches.
- Decimal inches: 0.0394 in
- Nearest 1/64: 3/64 in (+0.191 mm from the exact size)
How many inches is 1mm?
1 millimeter is equal to 0.0394 inches. That is the exact international conversion ( 1 in = 25.4 mm). On a fractional chart, the nearest 1/64 is 3/64 in.
How to convert 1mm to inches
Formula: inches = millimeters ÷ 25.4 (exact). Or multiply by 0.0393701 for a quick estimate of the same definition.
- Start with 1 mm.
- Divide by 25.4: 1 ÷ 25.4 = 0.0394 in.
- Reverse check: 0.0394 × 25.4 = 1 — the conversion round-trips cleanly.
About the fraction result
The decimal column is exact (shown to four places). The fraction is the nearest 1/64 approximation used on rulers and bit charts — so the two can disagree. Here, 1 mm = 0.0394 in exactly, while 3/64 in differs by +0.191 mm. The converter disclaimer (“rounded to the nearest 1/64 fraction”) exists so that difference is never mistaken for a data error.
Is 1 mm the same as 1/32 inch?
No. 1/32 in equals 0.79375 mm — about 0.206 mm smaller than 1 mm. On a 1/64 chart the nearest tick is 3/64 in (1.190625 mm), about 0.191 mm larger than 1 mm. In decimal inches 1 mm is 0.0394 in, or roughly 39.37 thousandths of an inch (thou/mil). For a thickness feel: about ten sheets of typical copy paper stack near 1 mm; a credit card (roughly 0.76 mm) is a bit thinner. Tiny clearances like this rarely land on a clean imperial tick.
Compared with 1/32 in (0.794 mm): 1/32 in is about 0.206 mm smaller than 1 mm.
Nearest inch fractions
Same conversion engine as the calculator. Diff (mm) is how far each size sits from exact 1 mm (positive = larger than 1 mm; negative = smaller).
| Comparison | Inches | mm | Diff (mm) |
|---|---|---|---|
| Exact | 0.0394 | 1 | — |
| Thou / mil | 39.37 thou | 1 | — |
| Nearest 1/64 | 3/64 | 1.191 | +0.191 |
| Nearest 1/32 | 1/32 | 0.794 | -0.206 |
| Often confused | 1/16 | 1.588 | +0.587 |
This page is for tiny clearances and thickness checks — not body measurements. For the full mm chart, see the mm to inches hub.
1mm to inches conversion chart
Local density around 1 mm (±1 mm, every 0.1 mm). For the full 0–100 mm table, use the mm to inches hub chart.
| mm | inches (decimal) | inches (nearest 1/64) |
|---|---|---|
| 0.1 | 0.0039 | 0 |
| 0.2 | 0.0079 | 1/64 |
| 0.3 | 0.0118 | 1/64 |
| 0.4 | 0.0157 | 1/64 |
| 0.5 | 0.0197 | 1/64 |
| 0.6 | 0.0236 | 1/32 |
| 0.7 | 0.0276 | 1/32 |
| 0.8 | 0.0315 | 1/32 |
| 0.9 | 0.0354 | 1/32 |
| 1 | 0.0394 | 3/64 |
| 1.1 | 0.0433 | 3/64 |
| 1.2 | 0.0472 | 3/64 |
| 1.3 | 0.0512 | 3/64 |
| 1.4 | 0.0551 | 1/16 |
| 1.5 | 0.0591 | 1/16 |
| 1.6 | 0.0630 | 1/16 |
| 1.7 | 0.0669 | 1/16 |
| 1.8 | 0.0709 | 5/64 |
| 1.9 | 0.0748 | 5/64 |
| 2 | 0.0787 | 5/64 |
FAQ
How many inches is 1 mm?
1 millimeter is equal to 0.0394 inches (1 ÷ 25.4). That is about 39.37 thousandths of an inch (thou/mil).
What fraction of an inch is 1 mm?
The nearest 1/64 is 3/64 in (1.191 mm), about 0.191 mm larger than exact 1 mm. The nearest 1/32 is 1/32 in (0.794 mm), about 0.206 mm smaller than 1 mm.
Is 1 mm the same as 1/32 inch?
No. 1/32 in = 0.79375 mm, about 0.206 mm smaller than 1 mm. On a 1/64 chart the closer tick is 3/64 in, about 0.191 mm larger than 1 mm.
How many mils / thou is 1 mm?
1 mm = 0.03937007874 in × 1000 ≈ 39.37 thou (mils). One thou is 0.001 in = 0.0254 mm.
How thick is 1 mm?
1 mm is 0.0394 in. Roughly ten sheets of typical copy paper stack near 1 mm; a credit card (about 0.76 mm) is a bit thinner. It is not equal to 1/32 in.