# Nautical Miles to Thou (nmi to thou) Source: https://www.unitconvertercalculator.com/length/nautical-miles-to-thou/ **1 nmi = 72913385.826772 thou** One nautical mile equals approximately 72,913,386 thou (about 72.9 million mils). Since 1 NM = 72,913 inches and 1 inch = 1,000 thou. The NM measures sea distances; the thou measures precision engineering. Both serve ships but at different scales. ## Formula Convert Nautical Miles to Thou ## Conversion Table | Nautical Miles (nmi) | Thou (thou) | |---|---| | 1.0E-8 nmi | 0.72913385826772 thou | | 1.0E-7 nmi | 7.2913385826772 thou | | 1.0E-6 nmi | 72.913385826772 thou | | 1.0E-5 nmi | 729.13385826772 thou | | 0.0001 nmi | 7291.3385826772 thou | | 0.001 nmi | 72913.385826772 thou | | 0.01 nmi | 729133.85826772 thou | | 0.1 nmi | 7291338.5826772 thou | | 1 nmi | 72913385.826772 thou | | 10 nmi | 729133858.26772 thou | | 100 nmi | 7291338582.6772 thou | ## Units ### 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. ### 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. ## Background 1 NM = 72.9 million thou. A hull rivet at 1,000 thou (1 inch = 25.4 mm) diameter holds a ship that travels thousands of NM. Ship construction specs use thou; voyage charts use NM. ## Good to Know American shipbuilding uses thou. American navigation uses NM. The same vessel exists in both measurement systems: built to thou tolerances, sailed across NM distances. The ship is the physical object that bridges two measurement worlds. ## FAQ ### How many thou are in 1 NM? One NM contains approximately 72,913,386 thou (about 72.9 million). ### How many NM is 1 thou? One thou equals approximately 1.371 x 10-8 NM. ### Is this conversion used? Not directly. But American shipyards specify tolerances in thou for vessels that will sail NM distances. ## Non-Frequently Asked Questions ### How many thou of hull wear per NM sailed? Steel hulls lose about 4-8 thou (0.1-0.2 mm) per year from corrosion. A ship sailing 36,500 NM/year loses about 0.00011-0.00022 thou per NM. That is about 1 thou per 4,500-9,000 NM. Every few thousand nautical miles costs you one-thousandth of an inch of hull. ### How many thou is a ship's draft? A large container ship draws about 16 m (630,000 thou = 630 inches) of water. That is 630,000 thou below the waterline while traveling thousands of NM on the surface. The thou measures what is underwater; the NM measures where it is going. ### If American shipyards went metric, would anything change? American shipyards already use metric for international contracts. Domestic Navy contracts still use inches and thou. Converting entirely to metric would require rewriting standards, retraining workers, and recalibrating instruments. The cost outweighs the benefit. So thou persist at sea. ## Related Articles - [Why We Measure: The Deepest Urge in Human Civilisation](https://www.unitconvertercalculator.com/blog/why-we-measure) - [The Map Is Not the Territory: Why Every Measurement Is Wrong](https://www.unitconvertercalculator.com/blog/the-map-is-not-the-territory) - [Zero: The Most Dangerous Number in Measurement](https://www.unitconvertercalculator.com/blog/zero-the-most-dangerous-number-in-measurement) - [The Body as a Ruler: Every Measurement Unit That Came From Us](https://www.unitconvertercalculator.com/blog/the-body-as-a-ruler) - [The Speed of Everything: How We Measure From Glaciers to Light](https://www.unitconvertercalculator.com/blog/the-speed-of-everything) - [15 Obscure Measurement Units You've Never Heard Of (But Still Need)](https://www.unitconvertercalculator.com/blog/obscure-measurement-units-guide) - [When Measurements Go Wrong - Disasters, Blunders and Happy Accidents](https://www.unitconvertercalculator.com/blog/when-measurements-go-wrong) - [The Surprising Stories Behind Everyday Units of Measurement](https://www.unitconvertercalculator.com/blog/stories-behind-measurement-units) - [Metric vs. Imperial - The Complete Guide to the World's Two Measurement Systems](https://www.unitconvertercalculator.com/blog/metric-vs-imperial-complete-guide) - [Length & Distance Conversion Guide - Meters, Feet, Miles & Kilometers](https://www.unitconvertercalculator.com/blog/length-and-distance-guide) ## See Also - [Thou to Nautical Miles](https://www.unitconvertercalculator.com/length/thou-to-nautical-miles/)