Inch Fraction Calculator
Convert decimal inches to fractions or fractions to decimal. Choose 1/8 to 1/64 precision. See mm, cm, and feet + inches equivalents.
๐ข Inch Fraction Calculator
FRACTION
Inch Fraction3 3/8"
DECIMAL
Decimal Inches3.3750"
METRIC
Millimeters85.73 mm
Centimeters8.573 cm
๐ก Decimal to Fraction Inch Conversion
Inch fractions use denominators that are powers of 2: halves (1/2), quarters (1/4), eighths (1/8), sixteenths (1/16), thirty-seconds (1/32), and sixty-fourths (1/64). They're the standard on US tape measures, rulers, and construction plans. For math with fractional measurements, try our feet and inches calculator or convert areas with our square footage calculator.
How to Convert Decimal to Fraction
- Separate the whole number: 3.375 โ whole = 3, decimal = 0.375
- Multiply decimal by your precision denominator: 0.375 ร 16 = 6
- Place result over denominator: 6/16
- Simplify: 6/16 = 3/8 (divide both by GCD of 2)
- Result: 3 3/8"
Decimal to Inches Chart
| Fraction | Decimal | mm |
|---|---|---|
| 1/16" | 0.0625 | 1.59 |
| 1/8" | 0.125 | 3.18 |
| 3/16" | 0.1875 | 4.76 |
| 1/4" | 0.25 | 6.35 |
| 5/16" | 0.3125 | 7.94 |
| 3/8" | 0.375 | 9.53 |
| 7/16" | 0.4375 | 11.11 |
| 1/2" | 0.5 | 12.70 |
| 9/16" | 0.5625 | 14.29 |
| 5/8" | 0.625 | 15.88 |
| 11/16" | 0.6875 | 17.46 |
| 3/4" | 0.75 | 19.05 |
| 13/16" | 0.8125 | 20.64 |
| 7/8" | 0.875 | 22.23 |
| 15/16" | 0.9375 | 23.81 |
| 1" | 1.0 | 25.40 |
Inches to Metric Conversion
mm = inches ร 25.4 | cm = inches ร 2.54
- 1/4" = 6.35 mm
- 1/2" = 12.70 mm
- 1" = 25.40 mm = 2.54 cm
- 6" = 152.40 mm = 15.24 cm
- 12" = 304.80 mm = 30.48 cm = 1 foot
Reading a Tape Measure
Tape measure markings are different lengths to indicate fraction size:
- Longest marks: whole inches (1", 2", 3"โฆ)
- Next longest: 1/2" marks
- Medium marks: 1/4" marks
- Short marks: 1/8" marks
- Shortest marks: 1/16" marks
Count the smallest marks past the last whole inch. If you count 7 marks of 1/16" size, the reading is 7/16".
3.375" = 3 3/8" = 85.73 mm. At 1/16 precision: 3 6/16" = 3 3/8" (simplified). In Fraction โ Decimal: 3 3/8" = 3.375".