# Thou to Nautical Miles (thou to nmi)

Source: https://www.unitconvertercalculator.com/length/thou-to-nautical-miles/

**1 thou = 1.3714902807775E-8 nmi**

One thou equals approximately 1.371 x 10-8 nautical miles. A nautical mile (72,913,386 thou) contains about 72.9 million thou. The thou measures ship construction hardware; the NM measures the ship's voyage.

## Formula

Convert Thou to Nautical Miles

## Conversion Table

| Thou (thou) | Nautical Miles (nmi) |
|---|---|
| 1 thou | 1.371490280777E-8 nmi |
| 1000 thou | 1.3714902807775E-5 nmi |
| 100000 thou | 0.0013714902807775 nmi |
| 1000000 thou | 0.013714902807775 nmi |
| 10000000 thou | 0.13714902807775 nmi |
| 50000000 thou | 0.68574514038877 nmi |
| 72913386 thou | 1.0000000023758 nmi |
| 100000000 thou | 1.3714902807775 nmi |
| 1000000000 thou | 13.714902807775 nmi |

## Units

### Thou (thou)

One thousandth of an inch (0.0254 mm). Also called a mil in the US. Used in engineering, manufacturing, and for measuring thin materials like plastic film.

### Nautical Mile (nmi)

Exactly 1852 meters by international agreement. Based on one minute of arc of latitude at the Earth's surface. The standard unit for maritime and air navigation.

## Background

A nautical mile is about 72.9 million thou. Hull rivets at 1,000 thou (1 inch) diameter must hold across NM-scale voyages. Ship construction specs in thou determine performance over NM-scale distances.

## Good to Know

Ships are born in thou and live in NM. Every weld, rivet, and seal is specified in thou. Every voyage is charted in NM. The ship is the physical object where thou-precision engineering meets NM-scale operation. The ocean tests every thou of construction at every NM of voyage.

## FAQ

### How many NM is 1 thou?

One thou equals approximately 1.371 x 10-8 NM.

### How many thou are in 1 NM?

One NM contains approximately 72,913,386 thou.

### When is this conversion used?

In naval engineering where construction tolerances (thou) must survive voyage distances (NM).

## Non-Frequently Asked Questions

### How many thou of corrosion per NM sailed?

Steel corrodes at about 4-8 thou per year in seawater. A ship sailing 100,000 NM per year loses about 0.00004-0.00008 thou per NM. Every NM of sailing costs less than one ten-thousandth of a thou. The ocean dissolves ships extremely slowly in thou-per-NM terms.

### How many thou of paint protects how many NM of voyage?

Anti-corrosion paint is about 8-20 thou thick. A ship is repainted every 3-5 years (about 300,000-500,000 NM of sailing). So 8-20 thou of paint protects 300,000-500,000 NM. About 0.00003-0.00007 thou per NM. Paint is remarkably efficient protection.

### How many thou wide is a propeller blade?

A large ship propeller blade is about 4,000-8,000 thou (4-8 inches / 100-200 mm) thick at the root. This blade pushes the ship thousands of NM per year. Thou-scale metal moves NM-scale ships. Engineering magnification at its finest.

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## See Also

- [Nautical Miles to Thou](https://www.unitconvertercalculator.com/length/nautical-miles-to-thou/)