Convert Millimeter to Nail
Convert millimeters to nails instantly. 1 millimeter = 0.0174978128 nail — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Nail to Millimeter converter for the reverse conversion.
Units explained
Millimeter
A millimeter is a metric unit of length equal to one thousandth of a meter (1/1000 m). It is the standard small-scale unit in the SI system and is widely used wherever sub-centimeter precision matters.
The millimeter was defined alongside the meter when France adopted the metric system in 1795, using the standard SI prefix milli- (from Latin mille, "thousand") to denote one-thousandth.
Millimeters are used in engineering drawings, machining, manufacturing, paper sizes, rainfall measurement, and any context where dimensions below one centimeter need to be specified clearly. Most rulers worldwide are marked in millimeters.
Adopted in 1795 in France as part of the original metric system; standardized internationally by the Metre Convention in 1875 and confirmed in the SI in 1960.
Nail
A nail is an Imperial unit of length equal to 2.25 inches (about 57.15 mm). It was historically used in the English cloth trade.
The nail derives from an English cloth-measure tradition dating to medieval times. Standardised at 2.25 inches (or 1/16 of a yard) through English customary practice and ratified by the 1959 International Yard and Pound Agreement.
Nails were historically used to measure cloth, particularly small pieces and ribbons. Rare in modern commerce but appears in historical textile literature and reproduction crafts.
Medieval English cloth-trade origin; standardised at 1/16 yard; fixed exactly at 0.05715 m via the 1959 International Yard and Pound Agreement.
Millimeter to Nail conversion formula
The relationship between millimeters and nails:
To convert millimeters to nails, multiply the value in millimeters by 0.0174978128. To reverse, multiply nails by 57.15.
How to use this converter
Type a value into the calculator. The result in nails updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Nail to Millimeter converter for the reverse direction.
Step-by-step: convert millimeters to nails
- Write down the value in millimeters (mm).
- Multiply that value by the factor 0.0174978128.
- The product is the equivalent value in nails (nail).
- To reverse, multiply the nail value by 57.15.
Worked examples
Example 1 — Convert 1 mm to nail:
1 × 0.0174978128 = 0.0174978128 nail
Example 2 — Convert 100 mm to nail:
100 × 0.0174978128 = 1.7497812773 nail
Real-world example — Hardware-scale dimensions
A 10-millimeter fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between millimeters and nails daily when mixing metric and imperial tools.
10 mm × 0.0174978128 = 0.1749781277 nail
Real-world example — Postcard and small-object dimensions
A postcard is about 5 millimeters wide. Converting to nails is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 mm × 0.0174978128 = 0.0874890639 nail
Real-world example — Ruler-scale measurements
A 30-millimeter school ruler converts cleanly to nails — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 mm × 0.0174978128 = 0.5249343832 nail
Millimeter to Nail conversion table
Standard reference values for converting millimeters to nails:
| Millimeter [mm] | Nail [nail] |
|---|---|
| 0.01 | 0.0001749781 |
| 0.1 | 0.0017497813 |
| 1 | 0.0174978128 |
| 2 | 0.0349956255 |
| 3 | 0.0524934383 |
| 4 | 0.0699912511 |
| 5 | 0.0874890639 |
| 10 | 0.1749781277 |
| 20 | 0.3499562555 |
| 30 | 0.5249343832 |
| 40 | 0.6999125109 |
| 50 | 0.8748906387 |
| 100 | 1.7497812773 |
| 500 | 8.7489063867 |
| 1000 | 17.4978127734 |
Frequently asked questions
How many nails is 1 millimeter?
How do I convert millimeters to nails?
How do I convert nails back to millimeters?
How many nails is 100 millimeters?
Popular length unit conversions
Convert Millimeter to other length units
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Metric / SI (17 units)
Imperial / US Customary (27 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 mm = 0.0174978128 nail) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.