1.5 inch to mm

Decimal: 1.5 inch

1.5 inch = 38.1 mm exactly (3.81 cm). The international inch is 25.4 mm, so multiply the inch value by 25.4.

Millimeters
38.1
Decimal inches
1.5000
Nearest 1/64
1 1/2 in (exact on 1/64)

The inches fraction result is rounded to the nearest 1/64 fraction.

1.5 inch to mm conversion

1.5 inch (1.5 inch) × 25.4 = 38.1 mm. Reverse: 38.1 ÷ 25.4 = 1.5 in. 1.5 inch is the decimal form of 1 1/2 inches to mm — both are 38.1 mm.

1.5 inch to mm calculator

Use the converter at the top. Type a decimal or a fraction (1/16, 3 1/2). Millimeters update from the same engine as the inch to mm hub (1 in = 25.4 mm).

How to convert 1.5 inch to mm

  1. Write the length as a decimal inch if needed: 1.5 in = 1.5 in (1.5 inch).
  2. Multiply by 25.4: 1.5 × 25.4 = 38.1 mm.
  3. Optional centimeters: divide millimeters by 10 → 3.81 cm.

Nearest metric size

The nearest metric size is 38 mm, 0.1 mm smaller than 38.1 mm.

1.5 inch is the decimal form of 1 1/2 inches: both are 38.1 mm. 38 mm is 0.1 mm smaller; 40 mm is 1.9 mm larger.

1.5 inch is 38.1 mm, not a whole millimeter. Whole-millimeter neighbors:

  • 38 mm is 0.1 mm smaller than 1.5 inch.
  • 39 mm is 0.9 mm larger than 1.5 inch.

Nearby inch fractions

Sixteenth-inch steps from the same 1 in = 25.4 mm factor. Linked rows have their own pages. The full fraction table is on inch to mm.

InchesDecimalMillimeters
1 1/4 in1.2531.75 mm
1 5/16 in1.312533.3375 mm
1 3/8 in1.37534.925 mm
1 7/16 in1.437536.5125 mm
1 1/2 in1.538.1 mm
1 9/16 in1.562539.6875 mm
1 5/8 in1.62541.275 mm
1 11/16 in1.687542.8625 mm
1 3/4 in1.7544.45 mm

Other inch fractions to mm

FAQ

  • How many mm is 1.5 inch?

    1.5 inch is 38.1 mm exactly. 1.5 × 25.4 = 38.1. That is the same length as 1 1/2 inches.

  • What is 1.5 inch in mm?

    1.5 inch in mm is 38.1 mm (3.81 cm). Searches for 1.5 inch to mm and 1.5 inches to mm use this conversion.

  • How many mm is 1.5 inches?

    1.5 inches is 38.1 mm exactly — the same as 1.5 inch and 1 1/2 inches. 38 mm is 0.1 mm shorter.