etwas auf dem Kasten haben

Using this phrase is quite simple. You just need to conjugate the verb haben. For example, er hat echt was auf dem Kasten. You can add ordentlich or richtig for extra emphasis. It works for general intelligence or specific technical skills. Use it when you are impressed by someone's performance. It sounds natural and very 'native.'

Use it when a friend fixes your broken laptop in minutes. Use it when a colleague gives a brilliant presentation. It is perfect for talking about someone behind their back in a good way. You might say it while watching a talented street musician. It fits perfectly in a casual office chat. It's great for showing respect for someone's hard work.

Don't use this in a highly formal written contract. It is a bit too colorful for a legal document. Avoid using it if someone is just lucky. This phrase is about earned skill, not a one-time fluke. Don't use it to describe physical objects. It only applies to people and their abilities. If your boss is very traditional, stick to kompetent instead.

This idiom likely comes from old school days. The Kasten (box) refers to the head or the brain. In the past, people thought of the head as a container for knowledge. If the box was full, you were smart. It has been a staple of German conversation for decades. It reflects the German value of being 'tüchtig' or capable. It’s a very grounded, practical way to praise someone.

Sometimes you will hear ordentlich was auf dem Kasten haben. This means they have 'a lot' in the box. You might also hear nichts auf dem Kasten haben. That is the mean version for someone incompetent. A similar vibe is helle sein (to be bright). Another one is Grips haben (to have brains). But auf dem Kasten remains the most classic version.