Measurement is from the inner circumference of the circle to the nearest mark made by the discus (to the nearest cm below) with the tape pulled through the centre of the throwing circle. The point of impact of the discus must be completely within the inner edge of the sector lines to be judged a valid throw.
Athletes may enter the circle from any direction but must leave from the rear half of the circle.
Athletes are permitted to interrupt a trial, which is indicated to the official by the laying down of the discus within the circle and the athlete may leave the circle (in the proper manner).
Weights
| U6 – U7 | 350g |
| U8 – U11 | 500g |
| U12 – U13 | 750g |
| U14 – U17 Girls | 1kg |
| U14 – U16 Boys | 1kg |
| U17 Boys | 1.5kg |