Convert 1 1 per Inch to 1 per Millimeter

1 in⁻¹ (1 per Inch) is equal to 0.039370078739999995 mm⁻¹ (1 per Millimeter). To convert from 1 per Inch to 1 per Millimeter, multiply by 0.039370078739999995 or divide by 25.400000000101603.

• 1 in⁻¹ × 0.03937007874 = 0.03937007874 mm⁻¹
• 1 in⁻¹ ÷ 25.400000000102 = 0.03937007874 mm⁻¹