Here is something I worked out years ago that helps me do the math in my head. I double the Celsius, subtract 10%, then add 32. So, in the first example; 20 doubled is 40. 40 minus 10% is 36. 36 + 32 = 68.

Almost the entire world uses Celsius. But we Americans have to stick to our Fahrenheit. It's a little insane. But my interest is personal. Two of my adult children are living in European countries and I want to be able to easily convert temperatures when we're chatting about the weather. This was so so helpful, Thank you very much!

Where has this been my whole life!? Thank yOu!

Thank you for breaking down the math in simple terms. You have a gift of teaching. I wish you were my math teacher growing up. Great job.

Great video! Excelent for like the weather forecasts and such. C -> F : Double and add 30 F -> C : Subtract 30 and half the result.

I wish YOU had been MY teacher back in the day! Thank you for making this conversion so easy to remember and accomplish! Great job!

The most accurate and yet still simplest means to the answer is F° =2C° -(10% of the preceding multiplication)+32° F° = 40 -4+32 F° = 68° 40°C =2(40) - 8 +32 = 104°F You can do it all in your head. I know I can.

I rarely comment on videos, but this one really deserves it. Thank you so much. 😄

I’m taking a certification test where I’ll have to do this with multiple choice. THANK YOU!!! This is going to make it EASY! I’m terrible memorizing formulas

Ok this is actually super helpful. As a new US expat in France I struggle all the time with the Celsius temperature. Thanks for this much easier to remember formula!

It takes almost 10 minutes to tell us how to figure it out in 5 sec - 10 sec in our heads...😂😂😂 (Actually did a great job!!)

You are amazing math teacher. I wish I had math teachers like you back in high school. Thank you so much for sharing your knowledge with us.

I took the practice quiz to the link you provided, and I scored 100%. I honestly couldn't remember the conversion method if I didn't look it up to work out my problems. This method is easier to remember. Thank you so much.

The way i convert c to f or vise versa is by knowing that 10°c is 50°F, and if you go up 10°c you go up 18°F or down 10°c you go down 18°F. And if you want to make it even easier like he does, make the 18 a 20

Thank you so much for explaining this video in a way that's simple to understand. I have had dyslexia or word processing disorder for as long as I can remember and now that I still have it in my adult years (and going into the medical field) and trying to understand myself and how my brain works has been a challenge for me but since taking what I have seriously and working around it by learning the way I receive information has helped me out tremendously! The way you broke this formula down, step by step, dissecting the context was amazing to me. It felt like I had a breakthrough and the feeling of "understanding" that I got from this video, gave me hope that I can convert in my head, without the use of a device or someone else helping me. I struggle on a daily and try not to let it show to others and this content made me feel like it was designed just for me. So, thank you for making these videos! I will continue watching your content and learning from your easy-to-understand video. Thanks again!

really awesome way to teach this trick, i could've benefit from my teachers in past if they could simplify the way you do. for real, props to ya!! 😭😅

Genius! Understood by the end of the video. Perfectly explained.

Just what I needed! I've been getting in some tourist Spanish, Italian, and Portuguese, but forgot to account for C vs F. Thanks!

VERY helpful! You are great at systematically teaching in a simplified manner. Awesome job! And as far as converting temperatures goes, estimating is pretty much all that is needed (save medical temps).

Hey thanks. That's great. Simple and easy. My wife ask me all the time how hot or cold it is and if it's gonna rain. Now I'll start doing this swap on her. With the rain, I already tell her it's a 50 percent chance. It either will or it won't.

This F to C, C to F conversion has bothered me for decades and today it has became a fun thing to do in head now!

This is so helpful & taught in a way both my children & I can understand. Thank you so much!

Nicely put. I feel like I watched way more than I needed to , just so I could explain it as well to someone else. But I liked how you go to hole numbers to break it down. Nice Video ,I could easily watch more.

Thank you so much for your videos, they’ve been a tremendous help to me going through my ST program.

That is a cool way of doing this. I am from the US and I chat with my friend in Canada frequently. She will tell me it is 20c and I will have to google to see what it is. Now I don't have to. Thanks!

You're INCREDIBLE for this. Thank you thank you. Studying for the MCAT here.

Very helpful . . . and nicely done! Thank you for posting.

Wow! Thank you SO much. I have always felt at a loss with this conversion...not anymore! Best--

Thank you so much, I've been trying to memorize the formula for ages:)))

Very nice and easy explaining. I always forget but I hope this will make me remember. I have tried various approaches to remember but by far this is the best approach. I hope you can make another advanced video to give an idea about when to add a couple of degrees or subtract to provide an even closer conversion.

So for celcius you can get ur final number and then subtract. So if 50 celcius comes out to 130 and its actually 122. Count your tens after 50. So 60 is 1 and 70 is 2 and 80 is 3 and all the way to 130 then subtract the 8 form 130 and you get 122.

Thank you sooo much for this clarity!!

I loved your teaching, I wish I had someone like you when I was growing up. You're fabulous. All that said, as someone who deals with this regularly I found an easier, faster way that you might like. Here goes. Today in Ireland it's 11 Celsius at 8am. I double that 11 and add 30. It is 52 farenheit which is almost exactly the farenheit number of 51.8. Reversal from farenheit is easy too, if its 70 farenheit and I want celcius then 70 minus 30 leaves 40 split in half is 20. 20 celcius is really 68 farenheit so not too far off (and here that's a bit of a heat wave. Lol.) I think my down amd dirty approach gets a good appropriate though without too much bother. Let me know if you see a flaw. I think it's not as good with larger temperatures but I live here so that's maybe ok with me. Have a lovely day and thank you again. Please keep posting. Love your style.

I got this super quick, im shocked i dont get math EVER!the letters acted somewhat as a guide or.. at any rate it worked! I'm 46 & FINALLY I won't be completely lost when hearing a reference to a temp in Celsius, Thank You so much! You must be a genius, it takes real intelligence to simplify these things in a way people like myself can grasp so quickly, Thank You!

I do something similar, but more accurate. I think of 1.8 as 2 - 0.2. So after I double I subtract 10% of the result, since 0.2 is 10% of 2. So 20 x 2 = 40. 40 - 4 = 36. 36 + 32 = 68.

Thanks for the great helpful advice love it .Hi from South Australia Adelaide 🇦🇺

Huh ? I feel as dumb as I did 45 years ago in math class, that went right by me.

OMG!! this is SO amazing! Thank you so much! I've struggled with this for many years when we travel! I'll share how I estimate kilometers to miles: if not round number, round up, divide in half and "add a little!" gets you pretty close! (e.g., 95 km rounds to 96 mi ÷2 = 48 plus add around 10 = 58 (actual answer is 59) - the greater the number of km, the more you have to add - however, I do NOT recommend this for figuring how fast you can drive! but not bad for figuring approximate distances!

Mannnnn, you made my life easy.. love this trick 😍

Yes. I love tricks like this. It helped get me through nursing school and has stuck with me, but I never knew one for this. Thank you.

Thank you so much for this, sir. I struggle mightily with simple math, and have to google every time I set my A/C or want to know the temp outside. I truly appreciate you taking the time to make this… from a 48 year old woman :)

Extremely helpful! Thank you so much for sharing this!

Very well explained. Thank you

This was super helpful! I'm traveling to Europe soon and trying to figure out the temp is frustrating. Your way of going from C to F is super simple! Double C plus and extra 30. (I'm remember the E as EXTRA...it just works for my brain.) Thank you!!

Omg. This is freaking amazing. Thanks so very much 🙏🙏🙏

Brilliant. Thank you so much for sharing this great trick for ball parking these conversions.

Thank you , this is brilliant ! Never stop learning and all the best :)

Brilliant! You're a great teacher! Thankyou

Awesome explanation, makes it really simple. Thanks for sharing

As we use Farenheight here in the US, traveling to Europe uses Centigrade, and I usually struggle what is it in F. Great trick to do it easily.

Wow, this was a great video and clever trick! I subscribed!!

Thank you, this was very helpful 👍

Thank you! I've never been taught this. I appreciate it so much.

Thank you sir, I play a lot of European and Canadian video games and the Celsius instead of fahrenheit is tricky. They really should have taught this better in school!

Thank you sooo much for your informative video 🙏🏻 I almost gave up on how to do C to F or vice versa. I found it hard to memorise the formula until I watched this video 🙃 God bless you for making one hurdle less in my brain 🙏🏻

Thx a lot Dude, now i know how to convert from C to F. You gave a really good explanation

Great tips! Thank you so much!

Love the CDEF mnemonic!! Thanks!

THANK YOU! It can't get simpler than this!

Thank you very much I fully appreciate it.

At first I was confused, but then I realized it's just either doubling then adding 30, or going backward in the same linear sequence by subtracting 30 then halving. Thanks!!

I wanna say thank you for making this video it really helps me youre my math hero😊

So 2 times Celsius plus 30 We'll get you within a couple degrees of the actual temperature very useful thank you

This was really helpful. Thank you!

That is brilliant. Thank you.

Wowwwwww thank you sooooo very much I can’t believe it this is so much earlier to remember. God bless you

So.o ..helpful & well taught. Thankyou

Thank you for the formulas. I learned this in grammar school, but after 55+ years I could not recall how to break it down unless I flip my weather app from F to C and C to F, when sharing temperatures information with a relative in Mexico.

I'm studying for an exam tomorrow, and we're supposed to know how to convert Celsius to Fahrenheit and vice versa. This was incredibly helpful! Thanks a lot!

This is great thank you. I wanted to add a little for those who might care. Without your help I would never have figured this out! I have to take my shoes off to count over 10. Grin. Although your formula is a great idea, the answer gap starts to widen when trying to convert unusually high celsius temps like oven temperatures! What if the quiz said 170° C equals??? The differential between the original formula and your suggested formula is quite large… You would be 370°, which is quite a gap between the original formula which comes out to 338°. Since 9/5 is 1.8; it is 10% higher than 2, and it's so much easier to use your suggested 2, how about taking your given Celsius of 20 and reducing it by 10% before anything else just leaving the 32 as is? Ex 20-10% = 18 2(18) + 32 = 68 And using the oven temp… 170° -17° equals 153° degrees. 153° times two equals 306°. Adding 32° to that equals 338° which is exactly what the original formula would have done. Adding the extra math in is difficult I know but it may help when a quiz has two answers that are way too close together.

Thank you!!! I understand math horribly but it makes sense when you explain it.😊

Omg this is amazing I paused the video and did the math and played it and got the answers right!!!! 🎉thanks so much

Very helpful. Thank you very much

Very cool way to convert AND work the brain a little ;)

You're a genius!! Thanks so much. You made it super easy, even for someone, like me, who is math challenged!! 😅😊

Amazing!! Thank you

Very useful, nice video

Thanks Mr. Teacher!

thank you soooo much.... very very very helpful!!!!!!!

LOVE THIS Thank you!

Just two remarks: “Wow!” and “Thank you!”

OMG thank youu soo much!! You just saved my hole lifee 😆

Thank you doctor 🙏🏻🙏🏻

Very nice. Thank you!

Your method thought me a lot I am in 5 th grade and I am studying from u for my final exam so thank you 🎉❤

This is great, thanks!

Thanks dude this made it easy af lol🎉

Thank you! I've got a cousin in the States and we're always converting our temps. Might need to do some brain work so it sticks but before you're lesson I know 20C is about 70F.

Any suggestions for K to C and vice-versa? Thanks

man besides information is right there everywhere pretty much and really does it matter if it says Celsius or Fahrenheit when it's 120 outside we f****** know it's hot

You teach math like I teach my boys math, very helpful! Ty!

Thanks for sharing!

Thank you so much sir😊👍

Great device that I think I can easily remember.

I love this so much

Thank you!!

❤ thanks this is a big help

or.... you could multiply by 2 then subtract 1 unit of the multiplied number, i.e. 2 x 20 - 20 or 2 x 36 - 36

I lived near Canada, and listened to Canadian radio stations, which I would get a estimate conversion by multiplying Celsius ✖️ 2, and add 32. My baseline 0° 6:44 × 2= 0 + 32 = 32° F. Yes, it is close estimate, but exact about freezing. 37°C is 98.6, I would then get a closer estimate comparing my answer to this.

Thank you !!!