42 mph is equal to approximately 67.5928 kmh.
To convert miles per hour (mph) to kilometers per hour (kmh), you multiply the speed value by 1.60934, since 1 mile equals about 1.60934 kilometers. Therefore, 42 mph multiplied by this factor gives the equivalent speed in kmh.
Conversion Tool
Result in kmh:
Conversion Formula
The formula to convert miles per hour (mph) to kilometers per hour (kmh) is:
kmh = mph × 1.60934
This works because 1 mile is equal to 1.60934 kilometers. So, by multiplying the speed in miles per hour by 1.60934, you get the speed in kilometers per hour.
For example, to convert 42 mph:
- Multiply 42 by 1.60934
- 42 × 1.60934 = 67.59228
- So, 42 mph = 67.59228 kmh
Conversion Example
- Convert 30 mph to kmh:
- Multiply 30 × 1.60934
- Result: 48.2802 kmh
- So, 30 mph equals 48.2802 kmh
- Convert 55 mph to kmh:
- Multiply 55 × 1.60934
- Result: 88.5137 kmh
- Therefore, 55 mph is 88.5137 kmh
- Convert 15 mph to kmh:
- Multiply 15 × 1.60934
- Result: 24.1401 kmh
- 15 mph converts to 24.1401 kmh
Conversion Chart
| mph | kmh |
|---|---|
| 17.0 | 27.3588 |
| 27.0 | 43.4522 |
| 37.0 | 59.5456 |
| 47.0 | 75.639 |
| 57.0 | 91.7324 |
| 67.0 | 107.8258 |
This chart shows select speeds in miles per hour and their equivalent in kilometers per hour. You can look up a value in mph, and see the converted kmh value next to it, useful for quick reference when you don’t want to calculate manually.
Related Conversion Questions
- How fast is 42 mph in kmh exactly?
- Is 42 mph faster than 67 kmh or slower?
- What would be the kmh speed if I drive 42 miles per hour?
- How do I convert 42 mph to kilometers per hour without a calculator?
- What is the quickest way to change 42 mph into kmh?
- If a car travels 42 mph, what speed is that in kmh?
- Can you show me the math for converting 42 mph to kmh?
Conversion Definitions
mph: Miles per hour (mph) is a unit of speed expressing the number of miles traveled in one hour. It is commonly used in the United States and other countries that use imperial units to measure vehicle speeds and distances.
kmh: Kilometers per hour (kmh) is a metric unit of speed representing the distance in kilometers traveled during one hour. It is widely used internationally, especially in countries using the metric system for speed limits and travel measurements.
Conversion FAQs
Why do we multiply mph by 1.60934 to get kmh?
Because 1 mile equals 1.60934 kilometers, multiplying by this factor converts the distance traveled in miles into kilometers, so the speed in miles per hour becomes the equivalent speed in kilometers per hour.
Can I convert kmh back to mph easily?
Yes, to convert kilometers per hour back to miles per hour, divide the kmh value by 1.60934. This reverses the original conversion and gives speed in mph.
Is the conversion factor exact or approximate?
The factor 1.60934 is a rounded approximation of the exact conversion (1 mile = 1.609344 km). For everyday use, this approximation is precise enough, but very high precision calculations might use more decimal places.
Does the conversion change if I’m measuring speed over different terrains?
No, the conversion between mph and kmh is a fixed numerical factor relating miles and kilometers, independent of terrain or environment. Speed units conversion does not depend on external conditions.
Why are mph and kmh both used around the world?
Different countries use different measurement systems. The US and a few others prefer imperial units like mph, while most countries use the metric system with kmh. Hence, knowing both units and how to convert helps in international travel and understanding speed limits.
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