km to Miles Converter
Convert kilometers to miles instantly — 1 km = 0.621371 miles
5 km =
3.1069 mi
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Quick summary
To convert kilometers to miles, multiply by 0.621371 (or divide by 1.60934). So 5 km ≈ 3.11 mi, 10 km ≈ 6.21 mi, and a marathon (42.2 km) ≈ 26.22 mi. To convert miles to kilometers, multiply by 1.60934. Use swap to reverse. Great for running distances and road trips.
Reviewed by Simple Calculators TeamLast reviewed
How to use this calculator
- Enter the inputs requested by the calculator.
- Choose the units or options that match your situation and review the assumptions.
- Run or update the calculation to see the result.
- Review the result, breakdown, and formulas shown on the page.
- Check the inputs, units, dates, and limitations before saving or sharing the result.
Frequently asked questions
How do I convert km to miles?
Multiply the kilometers by 0.621371, or divide by 1.60934. For example, 10 km × 0.621371 = 6.21 miles. To convert miles to kilometers, multiply by 1.60934.
How many miles is 5 km?
5 km is about 3.11 miles — a popular running-race distance. The reference table also shows 10K (6.21 mi), half marathon (13.11 mi), and marathon (26.22 mi).
How many miles is a marathon?
A marathon is 42.195 km, or about 26.22 miles (26.2 mi is the common figure). A half marathon (21.1 km) is about 13.11 miles.
What is a quick way to estimate km to miles?
Multiply by 0.6 for a rough figure (10 km → ~6 mi, close to the exact 6.21). For accuracy, use 0.621371, which this converter applies.
Key terms
- Kilometer (km)
- A metric distance unit; 1 km = 0.621371 miles.
- Mile (mi)
- An imperial distance unit; 1 mile = 1.60934 km.
- Conversion Factor
- Multiply km by 0.621371 to get miles.
Methodology, sources & limitations
This page shows the formula, assumptions, and limitations used for this estimate. Rates, thresholds, and other time-sensitive inputs can change, so verify them against the relevant official source before relying on a result.
For our review approach and the primary sources we consult, see the methodology and source policy. If you spot an outdated figure or formula, please contact us with a correction.