Also, I learned simple mph-to-kph conversions by forcing myself to exclusively use the metric setting on the speedometer. Easy, passive learning.
Also, switch your phone to Celsius!
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this post was submitted on 28 Mar 2026
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I don’t think I have ever seen a speedometer that could be switched like that. I’ve seen old digital ones that could be switched. But not one with a needle that didn’t just have both MPH and KPH on the dial marks.
I reached the 200000km mark when parking at home. How dull is that?
Apparently you can use the Fibonacci sequence to estimate the conversation pretty accurately.
Eg: 3mi is 5km, 5mi is 8km, 8mi is 13km, etc.
I usually just remember that 100km is about 60mph and scale from there
Yeah, that or the 1.6 thing (100mi is about 160km). Then just estimate from there.
The Fibonacci sequence tends to grow at the Golden ratio (approx 1.618) while the actual conversion is ~1.609 so it does usually work well.
In fact any Fibonacci-like sequence with different starting numbers eventually will work, after it gets past the initial crop of bad conversations, as such sequences have growth rates than tend toward the golden ratio as they grow long enough.
For example starting from 2, 9 instead of 1, 1:
2, 9, 11, 20, 31, 51, 82
20 mi ~= 32 km
31 mi ~= 50 km
51 mi ~= 82 km
You did it. You beautiful bastard.
200 000 Odos!
And you don’t have to look down to see how your prindle is set!