His first wife Vivian came from Cuba. For many years he has been in a relationship with a popular Polish actress Ewa Wisniewska. They split up after Krzysztof met actress Agnieszka Suchora, whom he married in 2002. He has two children: Wiktor (from his relationship with Vivian) and Gabriela (with Agnieszka Suchora).
Kowalewski has been awarded the Knight's Cross of the Order of Polonia Restituta (2002), Gold Medal of Medal for Merit to Culture, "Gloria Artis" (2009) and Grand Prize Splendor (Wielki Splendor) (1992).
He plays in his career in 120 films and TV shows & one thousand theater plays.
He provided a voices in Polish dubbing to many productions.
- Snow White and the Seven Dwarfs - Happy (Polish dubbing from 2009)
- Tarzan - Tantor
- Lilo & Stitch - Jumba
- The Haunted Mansion - Ghost #2
- Stitch! The Movie - Jumba
- The Princess Diaries 2: Royal Engagement - Mabrey
- Lilo & Stitch 2: Stitch Has a Glitch - Jumba
- Valiant - Sargeant
- The Chronicles of Narnia: The Lion, the Witch and the Wardrobe - Mr. Beaver
- Cars - Sheriff
- Leroy & Stitch - Jumba
- Ratatouille - Gusteau
- Bolt - Pigeon
- Bedtime Stories - Barry Nottingham
- Cars 2 - Sheriff