42 kilometers per hour (kph) is approximately 26.0974 miles per hour (mph).
To convert 42 kph to mph, you multiply by the conversion factor 0.621371. This factor converts kilometers to miles because 1 kilometer equals about 0.621371 miles. Applying this factor to 42 gives the mph equivalent.
Conversion Tool
Result in mph:
Conversion Formula
The formula to convert kilometers per hour (kph) to miles per hour (mph) is:
mph = kph × 0.621371
This works because one mile is approximately 1.60934 kilometers, or conversely one kilometer is about 0.621371 miles. So by multiplying the speed in kilometers per hour by this factor, you get the speed in miles per hour.
Example calculation for 42 kph:
- Take 42 kph
- Multiply by 0.621371: 42 × 0.621371 = 26.097382
- The result is approximately 26.0974 mph
Conversion Example
- Convert 55 kph to mph:
- Multiply 55 by 0.621371: 55 × 0.621371 = 34.175405
- Result: about 34.1754 mph
- Convert 30 kph to mph:
- 30 × 0.621371 = 18.64113
- Result is approximately 18.6411 mph
- Convert 65 kph to mph:
- 65 × 0.621371 = 40.389115
- About 40.3891 mph
- Convert 20 kph to mph:
- 20 × 0.621371 = 12.42742
- Result: 12.4274 mph
Conversion Chart
The following chart shows kph values from 17.0 to 67.0 and their mph equivalents. To use the chart, find the kph value in the left column and read across to see mph approximate value.
| kph | mph |
|---|---|
| 17.0 | 10.5633 |
| 22.0 | 13.6702 |
| 27.0 | 16.7770 |
| 32.0 | 19.8839 |
| 37.0 | 22.9908 |
| 42.0 | 26.0974 |
| 47.0 | 29.2041 |
| 52.0 | 32.3109 |
| 57.0 | 35.4178 |
| 62.0 | 38.5247 |
| 67.0 | 41.6315 |
Related Conversion Questions
- How fast is 42 kph in miles per hour?
- What is 42 kilometers per hour converted to mph?
- How do I convert 42 kph to mph without calculator?
- Is 42 kph faster than 25 mph?
- What speed does 42 kph equal in miles per hour?
- How many miles per hour is 42 kph on a speedometer?
- Can 42 kph be rounded to nearest mph?
Conversion Definitions
kph: Kilometers per hour (kph) measures speed by the number of kilometers travelled in one hour. Mostly used in countries using metric system for road speeds, it provides a way to quantify velocity based on the kilometer unit, which equals 1,000 meters.
mph: Miles per hour (mph) measures speed by counting miles covered in one hour. Common in the United States and UK for road speeds, a mile equals 5,280 feet or about 1,609 meters. Mph expresses velocity in the imperial system.
Conversion FAQs
Why is the conversion factor 0.621371 used to convert kph to mph?
The factor 0.621371 represents the ratio between a kilometer and a mile. Since 1 mile equals approximately 1.60934 kilometers, dividing 1 by 1.60934 gives about 0.621371, which converts kilometers into miles. This ratio applied to speeds changes units correctly.
Can I convert kph to mph by dividing instead of multiplying?
You could divide, but only if you divide by the kilometer-to-mile ratio. Dividing by 1.60934 converts kph to mph. Multiplying by 0.621371 is equivalent and often easier. Both methods yield the same result, just different arithmetic approaches.
What causes slight differences in conversion results between calculators?
Differences appear due to rounding and decimal places used in the conversion factor. Some calculators use truncated numbers like 0.62 while others use more decimal digits like 0.621371, leading to small variations in the final mph value.
Is it accurate to round the converted mph value to the nearest whole number?
Rounding depends on the needed precision. For everyday driving speeds, rounding to whole numbers often suffices. However, for scientific or technical purposes, more decimal places may be necessary to maintain accuracy.
Does converting speed affect time measurements?
No, converting speed units changes only the distance per time unit representation. The time interval (hours) stays constant, but the distance unit changes from kilometers to miles, so the numerical speed value adjusts accordingly.