Although point and line grading are widely utilized in garment CAD system, they have a common disadvantage: the increments of cardinal points or line on the to-be-graded patterns have to be calculated and inputted manually. In previous work, basic and fashion pattern are defined and the constant and proportional relation between them are considered to explore computerized grading. In the research, a dart pivotal-transfer relation between basic and fashion pattern is introduced. This paper proposes an automatic grading approach based on dart pivotal-transfers. This approach is illustrated with an example of the front panel of women’s jacket, the cardinal points concerning a dart are rotated around a pivotal-point, the increments of the cardinal points are transformed from that of original ones, and then the X and Y coordinates of the cardinal points in the to-be-graded pattern are gained. The experimental results show the approach is feasible.