How can I keep calm and not be nervous on stage?

Keeping calm under pressure can be very hard. To be honest practice helps a lot because it gives you more confidence. Speaking to others who have similar experiences might too as does keeping everything in perspective. It might be worth considering lots of self guided relaxation techniques too especially to do with breathing before hand might help (the self help guides are good). Personally I have found that in high stress situations it has been helpful for me to remind myself the whole way though 'it's all over' even when I am in the sitaution and then to try and focus on what I will do afterward right before instead of focusing on the very stressful here and now. Trying that technique though will work best if you are a rather visual person and willing to practice a lot.

Take 10-15 deep breaths, practice your content well. You feel a lot nervous when you are not familiar with the content or have not practiced it well. Another reason why nervousness arises is because of the fact that we might forget something on stage. It's all right to forget, nobody gets to know that you have forgotten to mention something except you. It's okay to make mistakes, we all mess up. I don't think so there has been a single person ever who has not messed up while being on stage :D. Trust yourself and you will do a great job.

Think positively, try to breath in and out slowly, and try to let go of all the worries you may have.

Nerves on stage are a normal reaction - when you have the "fourth wall" removed and an audience to play out to, it's easy to start self-analyzing and to become more aware of how your surroundings directly affect you. I think it's important to acknowledge how you are feeling, because if you are upset about being nervous, it can create even more anxiety. For me, it helps to think about breathing, to pick out one point of focus in the audience instead of scanning a sea of faces, and to think of nerves as "extra energy" that can also have a positive effect - after all, it often brings about the same physiological reactions as excitement!

I found that getting used to being on stage and in the wings as much as possible before the show really helped me. Butterflies are totally normal, but make sure to not hold onto any negative thoughts that come into your head. Practising your parts in front of people you know can also help make it feel a little more natural! Before you go out, try a few breathing exercises, and go and dazzle them!

Big oraters have accepted that at some point , the all faced stage fright. So it is normal. Have a clear head about your role / thing on the stage. Practice. Only you know you are nervous . Speak in a loud , clear and confident voice. Voila , you are done .

Take a deep breath and just do it as if nobody's actually watching. Pretend that nobody's there and just do it. Have the courage, I know you can do it.

Know that it's natural and there's nothing wrong with feeling nervous, but try to do some breathing exercises before going up on stage.

Tip: Bridge the familiar with the unfamiliar to overcome nerves: What has helped me is making eye contact with a friendly face in the audience in the middle, to the left and to the right of me and talking to them as if we where friends in a coffee shop together

Speaking or performing on stage, in front of people is a very common problem that a lot of people fear, me being one of them. One way that I have found useful is breathing exercises, even famous singers use these techniques to keep calm before going on stage. Once you are on stage and doing whatever it is you have to do a lot of people find their nerves disappear the longer they are performing so face the fear and do it anyway, imagine how amazing you will feel when you have finished!