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Home » Math & Conversions » Unit Conversions » Miles to Kilometers (mi to km) Converter Miles to Kilometers (mi to km) Converter A bidirectional converter for distance (mi ↔ km) and speed (mph ↔ kph). Enter a value in any field to convert instantly. Distance Conversion (mi ↔ km) Miles (mi) Kilometers (km) Speed Conversion (mph ↔ kph) For converting speeds, such as road signs or cycling data. Miles per Hour (mph) Kilometers per Hour (kph) How to Convert Miles to Kilometers Whether you're converting distance (miles) or speed (mph), 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 Mile = 1.609344 Kilometers To convert from miles to kilometers, you simply multiply the mile value by 1.609344. Example: Convert 100 miles to km. 100 mi × 1.609344 = 160.9344 km The Easy Mental Math Trick (The "5 and 8" Rule) For a fast, on-the-go estimate (like seeing a road sign in the US), this trick is extremely accurate. It's popular with European drivers and cyclists. Kilometers ≈ (Miles
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5) × 8 Example: Convert 50 mph to kph in your head. Divide by 5: 50
5) × 8 Example: Convert 50 mph to kph in your head. Divide by 5: 50
Calculators in 5) × 8 Example: Convert 50 mph to kph in your head. Divide by 5: 50.
Miles To Km Calculator
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