Tools for Anger management.

What would be the best possible way for anger management. Can you suggest me any tool or any methods for staying calm?

Anger is complicated!
In my experience anger is hurt, fear or frustration manifested. If you let it take the drivers seat you will crash every time. If you learn to see that anger is meant to teach you something it can be helpful. Succumb/indulge in it and you are it's victim.
I have also learned that when adrenaline levels are up, learning goes down. When adrenalin levels are down, learning ability levels go up.
So, use anger to be honest with yourself. WHY are you angry. Being angry with people most often is more about how we perceive things than an actual person(frustration). What they meant to us etc(fear). If we see them as of less valuable, they effect us less. Rather than just the emotion of ange,r being in control, we have to understand all the dynamics involved. Not to justify the "abuser" but to clarify the scenario.
Anger is meant to teach us to move BEYOND. Beyond being victimized (hurt)it can motivate us to learn a new way to adapt and grow. When we see why the Abuser is the way they truly are, it distances us from them and makes the blame set where it belongs rather than where it may hide.
Seeing things in this light has made my anger easier to understand, less shameful and more manageable.
It takes tons of practice and self reflection but ultimately I feel my thoughts are more in control that my emotions!
Best Wishes,
one

I used to have anger issue to points of extreme danger. Im still young, only 22, and still have a lot to learn, but there are certain things i have learned to do to help me calm myself down when i get angry. Some are better then others, and are left to the personal opinions of the individual.

First you must recognize that anger is an emotion, and therefor something you can control using your mind. It takes time and practice, and sometimes even tools to assist you. You need to learn to recognize you are getting mad/frustrated, before you get to the point of anger leading to action. when you feel it setting in, you need to make sure you control your breathing, if your heart rate and blood pressure stay low, you are less likely to have an adrenaline spike and loose control. Find something that has always made you happy, enjoy yourself, or even just relax. Use that to calm yourself down.

Im going to just list things i do when im getting mad/frustrated before i get mad in order to keep myself from getting to the point of no control...
-go for a walk/run
-think about good memories
-flip the problem off, say F*** OFF and walk away(actually helps you calm down)

In a situation when i get to the point were im going to lash out, and im beyond avoiding the anger cuz it has already set in, the options become limited but i have techniques that work for me...
-Pump down a smoke in record breaking time(im not a Dr, i can recommended it, get over it)
-Break a 2 by 4 or a chair, the act of destruction will keep you from going after a person
-Yell, LOUDLY!!!!

You need to just find things that calm you down personally, but there are certain things that are scientifically proven to help with anger. The number one most recommended(and scientifically proven) way to help with anger problems is athletic activity. Not so scientifically, but a personal observation, is that the more physical contact involved in the activity, the better it will assist you in being calm in every day life. it gives you a nice strong outlet for all your built up anger and stress.

(sorry i suck at spelling, most things if you sound out they make sense)