How many thou are in 1 rod?

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

How many rods is 1 thou?

One thou equals approximately 5.052 x 10-6 rods.

Is this conversion used?

Never. Land surveying and precision machining operate at completely different scales.

Rods to Thou (rd to thou) Converter

1 rd = 198,000 thou

1 Rod equals 198,000 Thou (1 rd = 198,000 thou). Convert Rods to Thou with formula, table, and examples.

One rod equals approximately 197,929 thou (about 198,000 mils). Since 1 rod = 198 inches and 1 inch = 1,000 thou, multiply 198 by 1,000. The rod measures land; the thou measures precision engineering. They share the inch as common ancestor.

How to Convert Rods to Thou

thou = rd × 198,000

Multiply the value in Rods by 198,000

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

Common Rods to Thou Conversions

Rods (rd)	Thou (thou)	Status
0.00001 rd	1.98 thou
0.0001 rd	19.8 thou
0.001 rd	198 thou
0.005 rd	990 thou
0.01 rd	1,980 thou
0.05 rd	9,900 thou
0.1 rd	19,800 thou
0.5 rd	99,000 thou
1 rd	198,000 thou
5 rd	990,000 thou
10 rd	1,980,000 thou
100 rd	19,800,000 thou

Good to Know About Rods to Thou Conversion

The thou and rod are the imperial system's precision extremes: the thou is the smallest common unit (0.001 inches); the rod is among the largest obsolete ones (198 inches). They share a common ancestor (the inch) but serve different centuries and different purposes. The inch connects them across 200,000:1.

Rods to Thou: What You Need to Know

A rod is about 198,000 thou. A 1-thou tolerance (25.4 um) is about 5.05 x 10^-6 rods. Both units derive from the inch: the rod is 198 inches; the thou is 0.001 inches. They are distant cousins in the imperial family.

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 →

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 →

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

Rods to Thou FAQ

One rod contains approximately 197,929 thou (about 198,000).
One thou equals approximately 5.052 x 10^-6 rods.
Never. Land surveying and precision machining operate at completely different scales.

Non-Frequently Asked Questions About Rods to Thou

Questions nobody should ask - but someone did.

At 1 thou per tolerance band, about 198,000 tolerance widths fit in a rod. Medieval measurement was accurate to maybe 500 thou (0.5 inches). So the rod's own accuracy was about 0.25% of its length. Modern 1-thou precision is 500 times better. Progress is measured in fewer thou of error per rod of length.
No. A wooden rod changes length with humidity (about 500-1,000 thou over its length). A machinist's gauge block is stable to 0.1 thou. The rod is about 5,000-10,000 times less stable than a gauge block. Medieval and modern precision cannot share instruments.
Rods varied by about 500-1,000 thou (0.5-1 inch) between counties. This variation caused property disputes for centuries. Modern surveying instruments are accurate to about 0.5 thou (0.01 mm). The improvement from medieval rod to modern laser is about 1,000-2,000x in precision.