Formula

PPM = (Number of Defective Parts ÷ Number of Parts Manufactured) × 1,000,000

Units

Defective Parts = Rejected / Defective Pieces
Parts Manufactured = Total Produced Pieces
Result = Parts Per Million (PPM)

Example

Defective Parts = 15
Parts Manufactured = 50,000

PPM = (15 ÷ 50,000) × 1,000,000
= 300 PPM