on each individual campaign landing page there is the total number of keywords for that campaign. just add all those numbers throughout your account.
Download your account to adwords editor, it shows all those stats, but make sure you keep an eye on it as it disappears once that account download is finished.
Go to the Find and Edit Keywords Tool: https://adwords.google.com/select/bulkfindeditkeyword On "Campaign Status" Select "All except deleted" Click "Continue >" Button and wait.. you will see: Number of matches found: xxx <--- Number of keywords on your account Maybe you are including the deleted one - The max # of active/paused keywords is 50,000 per account - when you reaches 45,000 they keep sending you boring warnings that you need to optimize your account.