When you have a new Android device, you must download the free app of Gmail into your Android device and set up Gmail in your device. But of late, most devices are offered with built-in apps and hence all you have to do is to set up and Gmail sign in. Once you have set up your Gmail account in Android, you do not have the necessity to sign in and out of Gmail. So if you wonder how to sign out of a Gmail account on Android, well, you have to remove your Gmail account from the Gmail app. The procedure is quite simple.
Open ‘Gmail’ app in your Android device and click the ‘menu’ tab. This would open the configuration menu found towards the bottom of the page. Now click the ‘accounts’ tab and this would open accounts menu for you. Now select the ‘account settings’ option and click on ‘manage accounts’ tab. Finally, to answer your question of how to sign out of a Gmail account on Android, click the ‘remove account’ tab found towards the bottom of the page. This would remove your Gmail account from your Android device.