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Originally Posted by Weldangrind
That makes perfect sense, because 50mph is about 80km/h.
For further reference, 30km/h is about 18mph, 40km/h is about 25mph, 50km/h is about 30mph, 60km/h is about 36mph, 70km/h is about 42mph, 90km/h is about 55mph and 100km/h is about 60mph.
The simple rule that I learned when Canada switched to the Metric system is to drop the zero from a metric speed and multiply by seven. Drop the zero from 50km/h to get 5, multiply by 7 to get 35mph.
I only had old cars with Imperial speedometers, so I got good at doing the math.  |
No my speedo is in MPH. Says MPH at the bottom.
Tested my speedo again. 53mph reads about 60mph on my tach. So its about 10% off.
I like your simple rule converting kmph to mph. I'll have to remember that.