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Miles to KM Converter
Convert international miles to kilometres for travel, road distances and training. See exact calculation steps, common distances, visual results and batch conversions.
Exact constants · fractions · batch conversion · visual scaleMiles → Kilometres
One international mile equals exactly 1.609344 kilometres. Multiply miles by 1.609344 to obtain kilometres.
Live length result
Converted measurement
Live conversion ruler
Both rows represent the same physical length. Their labels show why the numeric values change when the unit changes.
—The same length in every unit
Common values
Choose a familiar starting value or enter your own measurement above.
Conversion table
The table updates around useful values for this conversion.
| Starting value (mi) | Converted value (km) |
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Convert several values at once
Enter values separated by commas, semicolons, spaces or new lines. Up to 50 values are processed at once.
| Starting value (mi) | Converted value (km) |
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Exact conversion standard
One international mile equals exactly 1.609344 kilometres. Multiply miles by 1.609344 to obtain kilometres.
Where this conversion is useful
Mile-to-kilometre conversion is useful for speed and distance signs, travel plans, running logs, vehicle range estimates and routes shared with metric-system users.
Decimal and fractional inches
Decimal inches are best for calculations, while rulers, woodworking and construction often use fractions. The calculator shows the nearest common fraction without changing the high-precision decimal result.
Precision and rounding
The calculator retains full floating-point precision during calculations. Choose more displayed decimal places for technical work and fewer for everyday measurements. Do not imply more accuracy than the original measurement provides.
Zero is a valid length and converts to zero in every unit.
Batch conversion for lists and specifications
Paste a short list of dimensions to create a clean two-column result table. This is useful for product specifications, plans, training logs and travel notes.
Quick length conversions
Continue with the reverse direction, another common unit pair or the full Length Converter.
Miles to KM Converter – Frequently asked questions
How do I convert miles to kilometres?
Multiply miles by 1.609344. One mile equals exactly 1.609344 kilometres.
How many kilometres are in one mile?
One international mile equals exactly 1.609344 kilometres.
How many kilometres is 3.1 miles?
A distance of 3.1 miles is approximately 4.98897 kilometres, close to a 5K.
How many kilometres is a marathon?
A marathon is exactly 42.195 kilometres, which is approximately 26.2188 miles.
Can I convert a list of mile distances?
Yes. Enter up to 50 mile values in the batch converter to receive a two-column result table.
Does this use international miles?
Yes. The calculator uses the international mile of exactly 1,609.344 metres.
Can I use a comma as the decimal separator?
Yes. Both comma and period decimal separators are accepted.
Where can I convert kilometres back to miles?
Use the reverse-direction button to open the KM to Miles Converter.