Construction Estimating Formulas & Useful Information

Decimal and Millimeter equivalents of fractions of an inch.

Inches	Inches	Mm		Inches	Inches	Mm
1/64	.01563	.397		33/64	.51563	13.097
1/32	.03125	.794		17/32	.53125	13.494
3/64	.04688	1.191		35/64	.54688	13.890
1/16	.0625	1.587		9/16	.5625	14.287
5/64	.07813	1.984		37/64	.57813	14.684
3/32	.09375	2.381		19/32	.59375	15.081
7/64	.10938	2.778		39/64	.60938	15.478
1/8	.125	3.175		5/8	.625	15.875
9/64	.14063	3.572		41/64	.64063	16.272
5/32	.15625	3.969		21/32	.65625	16.669
11/64	.17188	4.366		43/64	.67188	17.065
3/16	.1875	4.762		11/16	.6875	17.462
13/64	.20313	5.159		45/64	.70313	17.859
7/32	.21875	5.556		23/32	.71875	18.256
15/64	.23438	5.953		47/64	.73438	18.653
1/4	.250	6.350		3/4	.750	19.050
17/64	.26563	6.747		49/64	.76563	19.447
9/32	.28125	7.144		25/32	.78125	19.844
19/64	.29688	7.541		51/64	.79688	20.240
5/16	.3125	7.937		13/16	.8125	20.637
21/64	.32813	8.334		53/64	.82813	21.034
11/32	.34375	8.731		27/32	.84375	21.431
23/64	.35938	9.128		55/64	.85938	21.828
3/8	.375	9.525		7/8	.875	22.225
25/64	.39063	9.922		57/64	.89063	22.622
13/32	.40625	10.319		29/32	.90625	23.019
27/64	.42188	10.716		59/64	.92188	23.415
7/16	.4375	11.113		15/16	.9375	23.812
29/64	.45313	11.509		61/64	.95313	24.209
15/32	.46875	11.906		31/32	.96875	24.606
31/64	.48438	12.303		63/64	.98138	25.003
1/2	.500	12.700		1	1.0000	25.400

Formula: 1 divided by the fraction = thousands of an inch.  For example: 1 ÷ 4 = .250