Miles to Kilometers
Miles to kilometers converter: multiply by 1.6093 (1 mi = 1.6093 km). Includes a reference table, sample calculations and the inverse ratio 0.62137.
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Miles to kilometers: the relationship and formula
Between miles and kilometers there is one constant ratio, 1.609344. Type any amount of miles into the widget and it multiplies that amount by 1.609344 to produce kilometers.
The ratio works in both directions: multiply by 1.609344 to go from miles to kilometers, or multiply by 0.62137119 to go from kilometers back to miles.
Quick lookup: miles in kilometers
Here are 12 values converted from miles to kilometers. Each row is the left-hand number multiplied by 1.609344.
| Miles (mi) | Kilometers (km) |
|---|---|
| 0.1 | 0.1609344 |
| 1 | 1.609344 |
| 2.5 | 4.02336 |
| 4 | 6.437376 |
| 12 | 19.312128 |
| 30 | 48.28032 |
| 60 | 96.56064 |
| 90 | 144.84096 |
| 180 | 289.68192 |
| 360 | 579.36384 |
| 720 | 1,158.72768 |
| 1,500 | 2,414.016 |
Values in the km column are shown the way the converter shows them, with a limited number of significant digits.
Worked examples for miles to kilometers
Suppose a quantity is 24 miles. Scaling it by 1.609344 gives 38.624256 kilometers.
Next, 9.5 mi: the converter shows 15.288768 km. Because the ratio is fixed, the km figure is 1.609344 times the mi figure.
For the last case, begin with 120 kilometers. Multiplying by 0.62137119 gives 74.56454307 miles.
The reverse: kilometers to miles
To start from kilometers instead, open Kilometers to Miles. For that direction 1 km = 0.62137119 mi, and its reference table is built around kilometers as the input.
For other combinations, the Length Converter offers every unit in one pair of dropdowns.
Other conversions in this family
These pages cover neighbouring unit pairs from the same converter.
Frequently asked questions
How many km make up 1 mi?
There are 1.609344 kilometers in one mile. Ten miles come to 16.09344 kilometers, and 100 mi come to 160.9344 km.
What is 1 km in mi?
The widget shows 0.62137119 miles for each kilometer. For 10 kilometers, the result is 6.213711922 miles.
How do I convert 48 mi to km?
48 mi converts to 77.248512 km, using the ratio 1.609344 between the two units.
How does the converter round results?
The widget calculates with ordinary floating-point numbers and only rounds what it displays. Results of 1 or more show up to 10 significant digits, results below 1 show up to 8, and results from 1,000 upward show up to 6 decimal places with thousands separators. As an example, 0.123456789 mi displays as 0.19868444 km and 1,234.5678 mi displays as 1,986.844282 km.
Where does the mi to km result come from?
Behind the scenes, miles and kilometers are each tied to the same base unit by a stored factor. The ratio of those factors, 1.609344, is what turns an mi value into a km value.
What is the reverse of mi to km?
Reversing the pair: multiply by 0.62137119, or equivalently divide by 1.609344. The page titled "Kilometers to Miles" covers it, or you can press the swap button in the widget above. Example: 25 km = 15.53427981 mi.
Learn more from an authoritative source:
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