How to calm down my lab?  

Yes he is a lab that is very normal behavior. You may want to take him to an obediant school/class. I know a lot of people that have done that and they have the dog that they have always wanted. I would see if him taking an obediant class helps him. It will help you not to be so annoyed with him anyway.
Take care and I hope I have helped.
Trish

well my second lab was just liek the way you said.... very hyper....and also sexually hyper at times which used to concern me a bit when with other people..... but it is very necessary to train the dog in basic obedience from the age of four months.... till one year that is when he becomes an adult.... but i had a lot of problems with my dog and also the same problem my friend was having with her dog which she finally had to get castrated.... which is the most desperate option to you!! but it does overcome with age!! just hope that the hyperness doesnt convert into anger or frustration which i have seen in most dogs

Hey i am also having a labrador, but it is a pup and its only three and a half months only. He is very playful, its very difficult for him to obey orders. He wont take it at all, but what i would suggest is a your dog is about to be an adult i hope that it will soon start to learn, no what you will have to do is to to make and always start with only one. If you have the time, then only you command him. When he is okay with your commands then let others to master him, i hope that will workout.

Hi elaine, how old is your Labrador now?
I think it's just their nature, they are always energetic and active, and they like to play a lot. My Labrador is now one and a half year old, and she still likes to run around with us and jump to us, we can't even keep her in the house, as my house is not that spacious for her to run around. I thought she would be more quiet when she grows up, but she is still very energetic now.

The vets always say that it takes three years for a Lab to become an adult and I must say I pretty much agree. My dog Daisy Lee is now pretty much always well behaved and she will be three in July. I just got a new Lab puppy in June and she is still a hyper little one. You just have to stick with it and love them no matter what because they love you forever. Walking and playing with them is the key though. These dogs need a ton of stimulation throughout the day.

our lab does that too..
but we've been training her to calm down when we say "Relax" and stuff like that..

like you..
we don't have schools for dogs here in this part of the Philippines..

so we train our lab ourselves..
she's gets the hang of it too
when ALL of us in the family tells her to "relax".. :D