Brad Pitt doesn't think he's spending enough time with his kids.

The 'Moneyball' actor - who raises six children: Maddox, 10, Pax, seven, Zahara, six, Shiloh, five, and three-year-old twins Knox and Vivienne, with partner Angelina Jolie - regards "time allocation" as a big part of his life in order for him to make sure he sees his youngsters as much as possible.

He said: "I want to spend my time with them. I'm not having enough time with them, so I push for that and then ultimately, we all have to go to work.

"With six kids it's all about time allocation now. As a parent I find that where you could sit back and be a bit more lackadaisical about your time, it's now like, 'OK, I've got 45 minutes here, I'm carving this out, I'm shutting the door, and I'm just going to the thing. And then I need to make sure my kids get this attention."

The 47-year-old star is much more careful about picking which films he acts in now because he realises his career may not last much longer, so he wants his movies to "mean something".

He added to the Daily Record newspaper: "A film is a big commitment as far as your time, your life. You get to do maybe one, two a year.

"I found it's got to mean something to me or what's the point? I don't know how much time I've got left and I would just want it to matter."