As far as I know there is currently no "amount of confirmations" displayed by any of the block explorers. However, an easy way around this is to subtract the block your transaction was included in from the current blockheight. This will give you the number of confirmations. Thus, let's say your transaction was included into block 1111111 and the current blockheight is 1111130, your transaction has 1111130 - 1111111 = 29
confirmations.
Note that you can check the blockheight of your transaction by entering the transaction ID / hash into MoneroBlocks. The From Block
is the blockheight your transaction was included in. The Height
on the front page of MoneroBlocks is the current blockheight.