How can you convert shore D to Shore A?

To convert Shore D hardness to Shore A, you can use conversion charts or formulas that provide equivalent values for the two scales, as they measure different hardness ranges. Typically, Shore D is used for harder materials like plastics and rubber, while Shore A is for softer rubbers. A rough conversion is that a Shore D value of around 70 corresponds to a Shore A value of about 90. However, it's important to refer to a reliable conversion chart for precise measurements.