5 ms·
A shockingly useful "quick and dirty" estimate for C to F for temps humans are likely to encounter is 2x + 30. It's not precise at all, but for purposes of "wha
by ubermonkey 1y ago
A shockingly useful "quick and dirty" estimate for C to F for temps humans are likely to encounter is 2x + 30. It's not precise at all, but for purposes of "what does that feel like outside" or "should I bring a sweater" it works pretty well.
21C would, by this estimate, be 72F. The true conversion is just shy of 70F, so, again, it's not correct but it's close enough for this kind of conversation.
- bryant 1y agofor what it's worth: add 9 degrees F (or 18 if it's easier to remember) for every 5 degrees C (10 C, easier), and peg 32F to 0C. You get: -40F=-40C -22F=-30C -4F =-20C 14F =-10C 32F = 0C 50F = 10C 68F = 20C 86F = 30C 104F= 40C and then approximate in between from there. It's quick enough for me now that I skip the 2x+30.
- abduhl 1y agoIn this HN subthread: users slowly converge on the conversion formula for Celsius to Fahrenheit (32+9C/5) in greater and greater precision while calling it an “approximation.”
- euroderf 1y ago10c is 50f (easy to remember) 27c is 81f (it's all threes!)
- noslenwerdna 1y agoThese points make it easy to remember for me, adding ~5C for 10 F. 40 F = 4 C (forty is four) 50 F = 10 C 60 F = 16 C (sixty is sixteen)
- freedomben 1y agoAlways interesting what's easier for some people. Personally 9/5x + 32 is much easier for me to remember and calculate
- iambateman 1y agoI try to remember: 0 = freezing 10 = chilly 20 = comfy 30 = warm 40 = scorching.
- patrickmay 1y ago30's hot, 20's pleasing, 10 is not, and 0's freezing.
- ubermonkey 1y agoAlso fun: FAHRENHEIT 0: Very cold 100: Very hot CELSIUS 0: Moderately cold 100: Dead KELVIN 0: Dead 100: Dead