US Survey Feet to Miles Converter

This calculator converts a length given in US survey feet into miles, using the exact US survey foot definition of 1200/3937 meters. You enter a number of survey feet, and the result is the equivalent distance in miles, rounded to two decimal places by default.

Formula

The conversion is straightforward: miles = survey feet ÷ 5,280. Both the US survey foot and the international foot contain exactly 5,280 feet per mile, so the numeric conversion factor is identical. The difference lies in the length of the foot itself:

• US survey foot = 1200/3937 meters (about 0.3048006096 m)
• International foot = exactly 0.3048 meters

So while the ratio of feet to miles is the same, a US survey mile is very slightly longer than an international mile. For most purposes the difference is negligible, but for precise land surveying it matters.

Worked Example

Using the default value of 5,280 US survey feet:

1. Write the formula: miles = feet ÷ 5,280
2. Plug in the value: 5,280 ÷ 5,280 = 1
3. The result is exactly 1 mile.

That matches the calculator output of 1.00 miles. If you enter 10,000 survey feet, you get 10,000 ÷ 5,280 ≈ 1.89 miles.

Why There Are Two Feet

In 1959, the United States and other English-speaking countries agreed to define the international foot as exactly 0.3048 meters. However, the U.S. had already used a slightly different foot for geodetic surveys, based on the older Mendenhall Order of 1893. That order defined the foot as 1200/3937 meters. To avoid disrupting existing survey data, the U.S. kept the old definition for “US survey feet” while adopting the international foot for most other purposes.

In 2020, the National Institute of Standards and Technology (NIST) announced that the US survey foot would be deprecated after December 31, 2022, in favor of the international foot. However, many legacy records and some state laws still reference the US survey foot, so conversions remain necessary.

When to Use US Survey Feet vs. International Feet

Use US survey feet when working with:

• Historic land records and property deeds in the U.S.
• State Plane Coordinate System (SPCS) data from before the 2023 transition
• Data from the National Geodetic Survey (NGS) that predates the change

Use international feet for:

• Everyday measurements and construction
• Most engineering and manufacturing
• Any new survey work after 2023

If you are not sure which foot your data uses, check the metadata or the source agency. Mixing them up can cause errors of about 2 parts per million – that is roughly 1 foot of error for every 500,000 feet (about 95 miles).

Common Mistakes and Misconceptions

One common mistake is assuming that the conversion factor to miles changes. It does not – both feet are exactly 5,280 per mile. The error comes from the length of the foot itself. Another misconception is that the US survey foot is only used in the U.S. In fact, it was also used in some Caribbean and Pacific territories, and the international foot is now the standard everywhere.

When converting from meters to miles, you must use the correct foot definition. For example, 1,000 meters is:

• 3,280.8399 international feet → 0.621371 miles
• 3,280.8333 US survey feet → 0.621370 miles

The difference is tiny, but in large surveys it accumulates.

Practical Applications

You might need this conversion when:

• Reading an old land survey that gives distances in US survey feet but you want miles
• Converting a property boundary description for a map or GIS
• Comparing historical survey data with modern GPS measurements

For example, a rectangular parcel that is 10,560 US survey feet long is exactly 2 miles. A parcel that is 1,000 feet long is about 0.189 miles (or roughly 1,000 feet).

Limitations and Precision

This calculator gives results to two decimal places, which is fine for most practical purposes. For high-precision work, you may need more decimals. The difference between US survey miles and international miles is about 3.2 millimeters per mile, so for distances under a few hundred miles, the difference is less than the width of a pencil. Only in large-scale geodetic work does it become significant.

Also note that the calculator assumes you are entering US survey feet. If your input is in international feet, the numeric result in miles is the same to two decimal places, but the actual physical distance differs slightly.

Frequently Asked Questions

How many US survey feet are in a mile?

Exactly 5,280 US survey feet are in a US survey mile. The number is the same as for international feet because the mile was defined as 5,280 feet in both systems. The difference is only in the absolute length of the foot.

Is a US survey mile longer than an international mile?

Yes, slightly. A US survey foot is about 0.0000006096 meters longer than an international foot, so a US survey mile is about 3.2 millimeters longer than an international mile. That is roughly the thickness of a few sheets of paper.

Why did the US stop using the survey foot?

To simplify measurements and align with international standards. The National Institute of Standards and Technology (NIST) announced in 2020 that the US survey foot would be phased out by the end of 2022. Most new surveys now use the international foot, but old data still exists.

Can I use this calculator for international feet?

Yes, the numeric result will be the same because the feet-to-miles ratio is identical. However, if you need the exact physical distance, you should know which foot you are using. For most everyday purposes the difference is irrelevant.

What is the difference in meters between the two feet?

The US survey foot is exactly 1200/3937 meters, which equals approximately 0.3048006096 meters. The international foot is exactly 0.3048 meters. The difference is about 0.0000006096 meters, or 0.000002 feet.

How do I convert miles to US survey feet?

Multiply the number of miles by 5,280. For example, 3 miles is 3 × 5,280 = 15,840 US survey feet. The same formula works for international feet because the ratio is the same.

Related

• Miles to Feet Conversion: Exact Formula & Quick Table
• Links to Feet Calculator: Convert Instantly
• Miles to Feet Converter: How to Convert

in ft | Length | US survey feet | 5280 | 0
out mi | Miles | mi | ft / 5280 | 2