What is the formula for kilometers (km) to miles (mi)?

The exact formula is: Miles = Kilometers × 0.6213711922. For most calculations, you can simply multiply your kilometer value by 0.62137.

How many kilometers are in a mile?

There are 1.609344 kilometers in 1 mile. To convert miles to kilometers, you multiply the mile value by 1.609344.

What is the easy trick to convert km to miles in your head?

A very popular and accurate mental math trick is the '8 and 5' rule (based on the Fibonacci sequence): Divide by 8, then multiply by 5. Example for 80 km: 80 / 8 = 10. 10 * 5 = 50 miles. (The exact answer is 49.7 miles).

Is kph the same as km?

No. 'km' (kilometers) is a unit of DISTANCE. 'kph' (kilometers per hour) is a unit of SPEED. They use the same conversion factor (1 kph = 0.62137 mph), but they measure different things. We have included both calculators on this page for your convenience.

Kilometers to Miles (km to miles) Converter

A bidirectional converter for distance (km ↔ mi) and speed (kph ↔ mph). Enter a value in any field to convert instantly.

Distance Conversion (km ↔ mi)

Kilometers (km)

Miles (mi)

Speed Conversion (kph ↔ mph)

For converting speeds, such as road signs or cycling data.

Kilometers per Hour (kph)

Miles per Hour (mph)

How to Convert Kilometers to Miles

Whether you're converting distance (km) or speed (kph), the conversion factor is the same. There are two main ways to do it: the exact formula for precision, and a simple mental math trick for quick estimates.

The Exact Formula

The internationally accepted conversion factor is:

1 Kilometer = 0.6213711922 Miles

To convert from kilometers to miles, you simply multiply the kilometer value by 0.621371.

Example: Convert 100 km to miles.
100 km × 0.621371 = 62.1371 miles

The Easy Mental Math Trick (The "8 and 5" Rule)

For a fast, on-the-go estimate (like seeing a road sign in Europe), this trick is extremely accurate. It's popular with cyclists and drivers.

Miles ≈ (Kilometers / 8) × 5

Example: Convert 80 kph to mph in your head.

Divide by 8: 80 / 8 = 10
Multiply by 5: 10 × 5 = 50 mph

(The exact answer is 49.7 mph, so this trick is incredibly close!)

Common Conversion Charts

Distance (km to mi)

Kilometers (km)	Miles (mi)
1 km	0.62 mi
5 km	3.11 mi
10 km	6.21 mi
25 km	15.53 mi
50 km	31.07 mi
100 km	62.14 mi

Speed (kph to mph)

Kilometers per Hour (kph)	Miles per Hour (mph)
30 kph	18.6 mph
50 kph	31.1 mph
80 kph	49.7 mph
100 kph	62.1 mph
120 kph	74.6 mph

Frequently Asked Questions (FAQ)

What is the formula for km to miles?

The formula is: Miles = Kilometers × 0.621371.

How many km in a mile?

There are **1.609344 kilometers** in 1 mile. To convert miles to km, multiply the mile value by 1.609344.

What is the "Fibonacci" trick for km to miles?

This is another name for the "8 and 5" rule. The numbers 5 and 8 are sequential in the Fibonacci sequence (1, 1, 2, 3, 5, 8). This ratio (5/8 = 0.625) is extremely close to the actual conversion factor (0.62137), making it a great mental shortcut.