Question 1

How many centimeters are in an inch?

Accepted Answer

Exactly 2.54 cm = 1 inch. This is an exact definition under the International System of Units (SI), established in 1959. So 1 inch = 2.54 cm, and 1 cm = 1/2.54 ≈ 0.3937 inches.

Question 2

How do I convert feet to meters?

Accepted Answer

1 foot = 0.3048 meters (exact). Multiply feet by 0.3048 to get meters. For example: 6 feet = 6 × 0.3048 = 1.8288 meters. To convert back: divide meters by 0.3048.

Question 3

How many miles in a kilometer?

Accepted Answer

1 kilometer = 0.621371 miles (approximately). 1 mile = 1.609344 km (exact NIST definition). To convert km to miles, multiply by 0.621371. To convert miles to km, multiply by 1.609344.

Question 4

What is a nautical mile?

Accepted Answer

A nautical mile is defined as exactly 1,852 meters (1.852 km). It is based on the circumference of the Earth and equals 1 minute of arc of latitude. It is used in aviation and maritime navigation. 1 nmi ≈ 1.15078 international miles.

Question 5

What is the difference between a US survey foot and an international foot?

Accepted Answer

The international foot is exactly 0.3048 m (since 1959). The US survey foot was 0.30480061 m, used in land surveying. The US officially retired the survey foot on January 1, 2023. Our converter uses the international foot (0.3048 m).

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Frequently Asked Questions

How many centimeters are in an inch?

How do I convert feet to meters?

How many miles in a kilometer?

What is a nautical mile?

What is the difference between a US survey foot and an international foot?

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