Fraction to Decimal Calculator
Convert fractional inches (e.g. 3/4 inch) to decimal inches instantly. Enter any whole number plus fraction, or pick a common preset from the table below.
Enter Your Fraction
Results update instantly+
inches
=
—
Decimal places:
Common Fraction Presets
Reference Table
Click any row to load that fraction into the calculator.
| Fraction | Decimal Inches |
|---|---|
| 1/16" | 0.062500" |
| 1/8" | 0.125000" |
| 3/16" | 0.187500" |
| 1/4" | 0.250000" |
| 5/16" | 0.312500" |
| 3/8" | 0.375000" |
| 7/16" | 0.437500" |
| 1/2" | 0.500000" |
| 9/16" | 0.562500" |
| 5/8" | 0.625000" |
| 11/16" | 0.687500" |
| 3/4" | 0.750000" |
| 13/16" | 0.812500" |
| 7/8" | 0.875000" |
| 15/16" | 0.937500" |
| 1" | 1.000000" |
Formula
decimal = whole + numerator ÷ denominator
Example: 1 3/4 inch = 1 + 3 ÷ 4 = 1.75 inches
Quick Facts
- 11/16 inch = 0.0625 — the smallest common fractional increment on imperial rulers.
- 21/8 inch = 0.125 — used extensively in woodworking and construction.
- 31/4 = 0.25, 1/2 = 0.5, 3/4 = 0.75 are the most common fractions.
- 4Standard US rulers are graduated to 1/16 inch. Engineering drawings often use 1/32 or 1/64.
- 5To convert decimal back to fraction: multiply by 16 to find sixteenths (e.g. 0.75 × 16 = 12/16 = 3/4).
How to Use
- 1Enter a whole number (optional) — e.g. 1 for 1¾"
- 2Type the numerator (top number) of your fraction
- 3Type the denominator (bottom number)
- 4Result updates instantly — or click a preset
Unit Reference
1 inch25.4 mm
1 inch2.54 cm
1/2 inch0.5000"
1/4 inch0.2500"
1/8 inch0.1250"
1/16 inch0.0625"