I used 500 calorie deficit from food, and then aimed for 500 calories from exercise, to give me the 1,000 deficit. It worked for me, and generally hit the kg/ 2lb a week.
However, I’m trying to drop a bit I put on during family holidays/ vacations, and am going for 15% deficit this time which seems a little more sustainable at my current weight mid 70kg’s weight. 500 calories was definitely doable when I was heavier though.