How many thou are in 1 rod?

One rod contains approximately 197,929 thou (about 198,000).

Are both units still used?

The thou is used daily in American manufacturing. The rod is completely obsolete, surviving only in historical property records.

Thou to Rods (thou to rd) Converter

Q: How many rods is 1 thou?

One thou equals approximately 5.051 x 10-6 rods.

1 thou = 0.000005 rd

1 Thou equals 0.000005 Rods (1 thou = 0.000005 rd). Convert Thou to Rods with formula, table, and examples.

One thou equals approximately 5.051 x 10^-6 rods (about 1/198,000 of a rod). A rod (197,929 thou) contains about 198,000 thou. The thou measures modern precision; the rod measured medieval land. Both are imperial, separated by 800 years.

How to Convert Thou to Rods

rd = thou ÷ 198,000

Divide the value in Thou by 198,000

Take your value in Thou
Divide by 198,000
Read the result in Rods

Common Thou to Rods Conversions

Thou (thou)	Rods (rd)	Status
1 thou	0.000005 rd
10 thou	0.0001 rd
100 thou	0.0005 rd
1,000 thou	0.0051 rd
10,000 thou	0.0505 rd
100,000 thou	0.5051 rd
198,000 thou	1 rd
500,000 thou	2.5253 rd
1,000,000 thou	5.0505 rd
5,000,000 thou	25.2525 rd

Good to Know About Thou to Rods Conversion

The thou and rod represent 700 years of measurement evolution within the same imperial family. The rod was state-of-the-art in 1300; the thou is state-of-the-art in 2024. The 5,000x precision improvement between them represents seven centuries of human ingenuity, one decimal place at a time.

Thou to Rods: What You Need to Know

A rod is about 198,000 thou. A 5-thou tolerance band is 2.53 x 10^-5 rods. Medieval rods were accurate to maybe 500 thou. Modern thou gauges measure to 0.1 thou. The precision improvement over 700 years is about 5,000x.

What is a 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.

Imperial engineering plastic film thickness wire gauges

Learn more about Thou →

What is a Rod? rd

Exactly 16.5 feet or 5.5 yards (5.0292 m). Also called a perch or pole. Historically used in land surveying.

Imperial land surveying historical

Learn more about Rod →

Going the other way? Use our Rods to Thou converter.

Thou to Rods FAQ

One thou equals approximately 5.051 x 10^-6 rods.
One rod contains approximately 197,929 thou (about 198,000).
The thou is used daily in American manufacturing. The rod is completely obsolete, surviving only in historical property records.

Non-Frequently Asked Questions About Thou to Rods

Questions nobody should ask - but someone did.

Historical rods varied by 500-1,000 thou (0.5-1 inch) between counties. A modern gauge block is accurate to 0.1 thou. The improvement from medieval rod to modern gauge is about 5,000-10,000x. Measurement precision doubled roughly every 70 years for 700 years. Slow but relentless progress.
Not for surveying. A thou gauge measures tiny objects close up. A rod measures large fields from a distance. Using a thou gauge on a 40-rod field would require 7.92 million measurements. The surveyor would die of old age before finishing the first furlong.
About 500-1,000 thou (0.5-1 inch / 13-25 mm). That was the uncertainty in their rod-length standard. Below that, medieval measurement was guesswork. Modern machinists routinely measure to 1 thou (0.025 mm). We are 500-1,000x better than our ancestors at knowing how big things are.