It calculates a score based on your gender, body weight, and total in the three main lifts (squat, bench and deadlift), then compares it to other lifters regardless of bodyweight or sex.
It’s basically a pound-for-pound comparison.
A few examples are…
If a woman weighs 150 pounds and can lift 500 pounds total her Wilks score will be 230.2 but for a man who weighs 180 pounds to be around the same strength or considered slightly stronger, he would have to be able to lift 753 pounds total (230.3).
If a man and woman weigh exactly the same and their weight lifted is also the same, the woman will naturally have a high Wilks score due to gender difference (men are obviously biologically stronger than women on average)