Also, I learned simple mph-to-kph conversions by forcing myself to exclusively use the metric setting on the speedometer. Easy, passive learning.
this post was submitted on 28 Mar 2026
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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