3/16 inch is the short mark on a standard tape measure. It appears as a grey tick between each eighth-inch mark. The decimal equivalent is 0.1875 inches (4.76 mm).
On the Tape Measure
Count 3 marks of this size from the last full inch line to reach 3/16. On professional colour-coded tapes the grey marks are the shorter marks between the inch lines.
Conversion Reference
| Fraction | Decimal | Millimetres |
|---|---|---|
| 3/16″ | 0.1875″ | 4.76 mm |
| Half of 3/16 | 0.09375″ | 2.38 mm |
Common Woodworking Uses
Cabinet fitting, fine trim work, door hinge mortise depth. The 3/16 mark is common in: standard framing, finish carpentry trim fitting, and cabinet construction tolerances.
Also works for recipe halving — the fraction math is the same. Half of 3/16 cup is 3/32 cup. Use the TapeMath calculator for any fraction arithmetic.
How to find it fast: On the TapeMath visual tape, hover over any mark to see its fraction, decimal, and mm immediately — no counting required.