Decimal Inch Chart

Use this decimal inch chart to compare decimal values, inch fractions, and millimeters in one table.

Decimal Inch Lookup

Use the main calculator to enter fractions, decimals, mixed inch values, or millimeters. The chart below gives quick reference values for this page.

Common decimal inch increments through one inch.

Decimal inch	Fraction	Millimeters	Nearest ruler mark
0.0313	1/32	0.794	1/32
0.0625	1/16	1.588	1/16
0.0938	3/32	2.381	3/32
0.1250	1/8	3.175	1/8
0.1563	5/32	3.969	5/32
0.1875	3/16	4.763	3/16
0.2188	7/32	5.556	7/32
0.2500	1/4	6.350	1/4
0.2813	9/32	7.144	9/32
0.3125	5/16	7.938	5/16
0.3438	11/32	8.731	11/32
0.3750	3/8	9.525	3/8
0.4063	13/32	10.319	13/32
0.4375	7/16	11.113	7/16
0.4688	15/32	11.906	15/32
0.5000	1/2	12.700	1/2
0.5313	17/32	13.494	17/32
0.5625	9/16	14.288	9/16
0.5938	19/32	15.081	19/32
0.6250	5/8	15.875	5/8
0.6563	21/32	16.669	21/32
0.6875	11/16	17.463	11/16
0.7188	23/32	18.256	23/32
0.7500	3/4	19.050	3/4

Note: Values are based on 1 inch = 25.4 millimeters.