To take same example on the article: http://www.pokerstrategy.com/strategy/others/2251/1/
(First example facing all in pre-flop)
I don't seem to understand how to calculate equity against my opponent's range. If my hand is QQ (given I need 40% equity to break even) and opponent's range is (JJ+, AK) is there a way to calculate my equity agaisnt my opponent's range? In the article just says is 47%. So I'm confused about if there's way to actually calculate it? Or can it only be done by equilab?
I think it can only be done with a tool like equilab.
If someone can calculate this in his head he must have a superbrain or something like that 
On the other side if you have used equilab alot than you will have a feeling for how much equity you have against a xy range.
Hi, lkdr9494...
Equilab is the tool for this.
Here is the output from your example:
Equity Win Tie
UTG 47.37% 45.79% 1.58% { QQ }
UTG+1 52.63% 51.05% 1.58% { JJ+, AKs, AKo }
The equation given is:
Required equity = price of calling / (pot size + price of calling)
The example is:
Preflop: Hero is Button with Q:dQ:h
3 folds, Hero raises to $0.50, SB raises to $2.00, 1 fold, Hero raises to $5.00, SB raises to $25.00 and is all-in, Hero?
At this point the pot is 25 (from SB) 0.25 (from BB) and $5.00 from Hero making $30.25
The price of calling is 20.00 (you already have $5 in there)
So the required equity is
20/(20+30.25) = .40
Your equity is GREATER than this so it is a call.
If your opponent is REALLY tight -- and hardly ever shoves -- we might conclude that he only shoves KK+, in which case it is an easy fold.
Download Equilab and learn to use it.
A lot of articles on Equity make use of it.
All the best,
--VS
