5/16 inch to mm

Decimal: 0.3125 inch

5/16 inch (0.3125 inch) = 7.9375 mm exactly (0.7937 cm). The international inch is 25.4 mm, so multiply the inch value by 25.4.

Millimeters
7.9375
Decimal inches
0.3125
Nearest 1/64
5/16 in (exact on 1/64)

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

5/16 inch to mm conversion

5/16 inch (0.3125 inch) × 25.4 = 7.9375 mm. Reverse: 7.9375 ÷ 25.4 = 0.3125 in.

5/16 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 5/16 inch to mm

  1. Write the length as a decimal inch if needed: 5/16 in = 0.3125 in (0.3125 inch).
  2. Multiply by 25.4: 0.3125 × 25.4 = 7.9375 mm.
  3. Optional centimeters: divide millimeters by 10 → 0.7937 cm.

Nearest metric size

The nearest metric size is 8 mm, 0.0625 mm larger than 7.9375 mm.

8 mm is 0.0625 mm larger than 5/16 inch (7.9375 mm).

5/16 inch is 7.9375 mm, not a whole millimeter. Whole-millimeter neighbors:

  • 7 mm is 0.9375 mm smaller than 5/16 inch.
  • 8 mm is 0.0625 mm larger than 5/16 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
1/16 in0.06251.5875 mm
1/8 in0.1253.175 mm
3/16 in0.18754.7625 mm
1/4 in0.256.35 mm
5/16 in0.31257.9375 mm
3/8 in0.3759.525 mm
7/16 in0.437511.1125 mm
1/2 in0.512.7 mm
9/16 in0.562514.2875 mm

Other inch fractions to mm

FAQ

  • How many mm is 5/16 inch?

    5/16 inch is 7.9375 mm exactly. 5/16 × 25.4 = 7.9375. The decimal form is 0.3125 inch. 8 mm is 0.0625 mm larger.

  • What is 5/16 inch in mm?

    5/16 inch in mm is 7.9375 mm (0.7937 cm). Searches for 5/16 inch to mm use this conversion.

  • Is 5/16 inch 8 mm?

    No. 5/16 inch is 7.9375 mm; 8 mm is 0.0625 mm larger. 8 mm is the nearest whole millimeter.