"Running shoes should be a whole size up" ??

Whole size up from what? I do in fact do a full size up from what the Brannock device measures, but I consider that my size. I sometimes size up another half to full size depending on how the shoe actually fits my feet (1.5 to 2 up from Brannock). My feet are wide in the forefoot (bunions), so I definitely try to avoid tight shoes.

I don't know why they say that. I wear only TTS shoes and never had a problem.

The Brannock device gives your size for dress/work shoes. For most of my life, I wore a 1/2 size up in sneakers/running shoes. For example my dress shoes are 10.5 and my running shoes were 11. However, a couple of years ago, I started noticing that I needed an 11.5 in some brands.

My opinion is that running shoes should fit comfortably. Not tight, no rubbing, but not so loose that your foot moves inside the shoe. Feet do swell from running and being on your feet, but not enough to make a huge difference.

Absolutely.

You need some wiggle room in running shoes. On trails I prefer it a little more snug but I have no idea what people do with track shoes.

I believe things have changed. I purchased 1/2 size up for the past many years. Now my toes are getting battered by various models of shoes. I've always purchased "wide" now I'm going to try a full size up.

I think it's ridiculous to assume someone's feet will swell to the point you need a size up.

I've run 11 marathons and that's never been an issue.

I've been running for over 20 years but was also surprised by this same advice given to me a couple of years ago. I measure at exactly 9.5 and always ran in 9.5s. I took their advice and started running in 10.5.

I noticed the difference immediately, one size up feels so much better. I wish someone told me to do this earlier.

Also, at the time I had a stubbed some toes and they weren't healing because my shoes were too cramped. Going up a size made a huge difference in that regard.

This.

Measure with the Brannock then go a 1-1.5 up from there. Many boys/men only ever wear shoes that fit this way whereas women were always surprised at the store and would say things like, "I've never been a 9 before", so that was annoying lol

I ran for all of high school and college. Foot size was always measured at 9.5-10. Recently been more into biking. Got re measured at the store and i'm around 8.5 after a couple of years with light/ no running.

Yes a whole size up from converse, but from any normal shoe, no.

When I went to Fleet Feet the first time a few years back they told me the same thing. Since then I have done it and it made a world of difference for me

my dress shoe size is a 9.5 and I wear a 10.5 in most running shoes.  It used to be common knowledge to size up from dress shoe to athletic shoe, but no one seems to wear dress shoes anymore.  The god awful "dress sneaker" is now a thing {end old guy rant}

My feel swell condiderably during marathons and I usually lose most of my toe nails as a result.  That's not why you "size up" in a running shoe though.  I run 2 marathons a year, the other 300+ runs are mostly 10 miles or less.  

So your feet swell up when you run to the point of having to buy your shoes a size up??

Weird.

I guess there are lots of runners that like their shoes to be "snug." That sort of makes sense if you want secure footing and less slippery shoes with less chance of heel rub etc.

But I made a big positive change in my feet's comfort and effectiveness by going a half-size larger than normal for me. Thicker socks helped. Heel spurs cooled off and overall feel was more comfortable. Not a recommendation, just a personal note...

Transitioning from not running to running regularly will likely increase your shoe size by half, but it’s best to buy something that fits comfortably *currently* coz your feet become slightly bigger (because of arch adjustment and muscle growth, not swelling that is mostly temporary) slowly over time, not overnight, so the shoes will accordingly stretch over time as well, and in any case, you can always use a shoe stretcher to stretch them more if needed.

If I went to a running store and the shoe person told me my feet would swell to the point where I needed a size up in my running shoes I'd walk out.

I usually go a half size down and go barefoot in spikes, most people I know wear socks and go TTS

Yeah. For me, I wear a an 11 dress shoe, but a 11.5 for running shoes.

I've worn Adidas for the past 10 years, and now also running in Saucony (Endorphin Pro 2). Those two brands fit me great at 11.5.

I haven't worn anything Nike in over 10 years, but the last time I tried a pair, I had to go up a whole size to 12 to have enough toe room, but then the rest of the shoe felt too big.

Yes. Shoe store employees are told to sell orthotics and size up one full size. They also make $9/hr so take what you want with that.