Furlong

A furlong is a way to measure distance.

It is one-eighth of a mile. Long ago, it was a length for farming. It was the distance oxen could plough. This was the length of a long furrow.

Today, many people use it for horse racing. Some cities use it to measure street blocks. It is about 201 metres long. It is a very useful way to measure.

A furlong is a way to measure distance. It is one-eighth of a mile.

You can also think of it as 660 feet. It is about 201 metres long.

The name comes from old words for a long furrow. A furrow is a long line in a field. Long ago, a furlong was how far oxen could plough. This was the distance they could go without a rest. Turning heavy oxen was hard. So, farmers made the lines as long as possible.

Today, we use the furlong in new ways. It is very common in horse racing. Many races use it to measure how far horses run.

Some places use it for roads and cities too. In Chicago, many street blocks are about one furlong long. In Salt Lake City, downtown blocks are a square furlong. In Myanmar, highway signs use miles and furlongs to show distance. Even in Canada, some big roads follow a grid of furlongs. These roads stay about two kilometres apart.

A furlong is a special way to measure distance. It is exactly one-eighth of a mile.

You can also say it is 660 feet or 220 yards long. In the metric system, it is about 201 metres. This means five furlongs are almost exactly one kilometre. People still use this unit in many different ways today. It is most famous for measuring distances in horse racing.

In many countries, race lengths are given in miles and furlongs.

How does a furlong work with other measurements? It fits perfectly into a system of smaller units. One furlong is equal to 10 chains. It is also equal to 40 rods or perches. If you want to measure a large area, you can use it too. An acre is a shape that is one furlong long. An acre is also one chain wide. This makes the area 40 rods by 4 rods. These units all fit together like pieces of a puzzle.

The history of the furlong goes back a very long time. The name comes from Old English words for a long furrow. A furrow is a long line made by a plough in a field. Long ago, a furlong was how far oxen could plough without resting. Turning a heavy team of oxen was a hard job. Because of this, farmers made the furrows as long as possible. This helped them avoid turning the animals too often. In the late 13th century, England began to standardize these lengths.

Different places have used slightly different numbers for the furlong. In the United Kingdom and Canada, it is 201.168 metres. In the United States, some older definitions were a tiny bit different. This difference was only about two parts per million. That is a very small amount that does not change much for most people. The United States is now moving to the same international definition. This makes the measurement the same everywhere. This helps people avoid confusion when they measure things.

You can find the furlong hidden in the layout of many cities. In Chicago, many city blocks are about one furlong long. This happens because the city uses eight blocks for every mile. In Salt Lake City, the downtown blocks are shaped like a square furlong. You can see this pattern in Phoenix, Arizona, too. In Ontario, Canada, many major roads follow a grid of ten furlongs. These roads are usually about two kilometres apart. Even in Myanmar, highway signs show distance using miles and furlongs.

A furlong is a unit of distance used in imperial and United States customary systems. It represents exactly one-eighth of a mile. You can also define it through several other measurements. One furlong equals 660 feet or 220 yards. It is also equivalent to 40 rods, also known as perches, or 10 chains. In the metric system, a furlong is approximately 201 metres. Specifically, using the international yard of 0.9144 metres, a furlong is exactly 201.168 metres.

This measurement is highly useful because five furlongs equal almost exactly one kilometre.

The mechanism of the furlong is tied to how it relates to other land measurements. It acts as a building block for larger areas like the acre. An acre is defined as an area that is one furlong long and one chain wide. This creates a shape that is 40 rods by 4 rods, totaling 160 square rods. Historically, a square furlong contains exactly 10 acres. This mathematical relationship allowed early surveyors to calculate large fields using simple ratios. The system relies on these consistent proportions to maintain accuracy across different scales of land.

There are several distinct ways the furlong is applied today. In most English-speaking countries, it is a standard measurement for horse racing lengths. In the United Kingdom, it is also used to express distances along canals navigated by narrowboats. Some cities use the furlong to define their urban layouts. For example, Chicago uses a system where eight blocks make up one mile. This means a typical city block is approximately one furlong in length. Other cities, like Salt Lake City and Phoenix, use square furlongs for their downtown blocks.

The history of the furlong begins with the agricultural needs of the Anglo-Saxons. The name comes from the Old English words for "furrow" and "long." A furrow is the long line made in a field by a plough. Originally, a furlong was the distance a team of oxen could plough before needing a rest. Turning a heavy team of oxen was a difficult task for farmers. To avoid frequent turns, they created long furrows. This practice established the furlong as a standard length of 40 rods or 10 chains.

Measurement standards changed significantly in the late 13th century in England. Before this, the Saxons used the North German foot, which was 10 percent longer than the modern international foot. When England adopted a shorter foot, the rods and furlongs themselves stayed the same. Only the number of feet and yards within them changed. A furlong moved from 600 old feet to 660 new feet. Similarly, an acre changed from 36,000 old square feet to 43,560 new square feet. This transition ensured that existing property boundaries remained valid even as the base units evolved.

Significant variations in the furlong have existed due to different national standards. In the United States, some states used the U.S. survey foot for surveying. This created a tiny difference of about two parts per million compared to the international definition. This variation was too small to cause practical problems for most people. However, the U.S. National Geodetic Survey and NIST decided to retire the survey foot. By the end of 2022, the United States moved to the international definition. Now, a furlong in the U.S. is exactly 201.168 metres, just like in Canada and the UK.

The furlong connects to many different fields, from history to modern urban planning. In Ontario, Canada, many major roads follow a ten-furlong grid. Because of this, these roads are often spaced almost exactly two kilometres apart. In Myanmar, highway signs still use miles and furlongs to show distances.

Even in specialized academic settings, the furlong appears in humorous unit systems. It remains a lasting legacy of how ancient farming practices shaped the way we measure the world today.