I'm just curious if folks are calculating hand equity on the fly in live games. For example, let's say we are in this type of position. We are in the CO:

Board: KJ9
Equity Win Tie
MP3 39.66% 35.59% 4.07% { 99+, ATs+, KTs+, QTs+, JTs, ATo+, KTo+, QTo+, JTo }
CO 60.34% 56.27% 4.07% { KQ }

Let us say that opponent is short stacked and shoves on this board. We have KQ so we have top pair with a gut shot and a backdoor flush draw. If we believe that our opponent's shove range is wide due to being short stacked, am I as a player in a live game supposed to run some rudimentary math in my head to come to the conclusion that I have 60% equity in this pot and I should always call (assuming I have his range correct)?

Maybe this example is a little too simple but I hope I am getting my point across.

Practice with an equity calculator will answer this question.

Use an equity calculator and run some common spots.
After a while you will pick up a pattern which makes it very easy to remember.

I never do math during a hand, not even for pot odds or things like that. I have played enough hands to know when a spot is profitable and for most hands it's quite clear what you should do. It's the hands where the EV between actions is quite close and whatever math you're doing isn't going to be practical because the differences are so small and you need accurate calculations. Just practice, analyze after hands and during the hand you basically know what to do.

I think that repetition is about the best way to get a solid understanding of equity. I downloaded Equilab and used the equity trainer for about 15 minutes a day and that did wonders for me. I started to consistently get within 2 or 3 points of the equities given for each matchup.
Equilab is almost like PokerStove. I like it better than Stove 'cause when I was first learning to count combos, I changed a few settings in Equilab and it would display the amount of combos for each hand that I chose on the hand grid. I tend to think of Equilab as PokerStove on steroids or something like that.
That was about 2 years ago. I'd still use it today, except that my current PC has an OS that is much to old and it won't even install Equilab without complaining about a missing driver (I should update my OS already).
Anyway, just Google "equilab"; download the free version; and play around with the "equity trainer" every so often and you'll get better at estimating a hand's equity in various situations. You'll probably like the other features also.

I have Equilab. That is where I put those equity calculations in my OP. I didn't even know it had a trainer. This is basically what I have been wanting.

I had no idea myself that Equilab had a trainer. Just had a go and this is an extremely helpful tool. Thank you.