Convert Inches (in) to Inches (in)

1 inch equals 1 inch.

Formula: in = in × 1

Inch to Inch Converter

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Sig. Figures:

How to Convert Inch to Inch

1 inch = 1 inches

Inch = Inch × 1

Example: 1 in × 1 = 1 in

Reverse Conversion

To convert inches back to inches:

  • Remember, 1 inch equals 1 inches.
  • To convert 1 in to in, multiply 1 x 1, resulting in 1 in.

Fractional Inches to Inch Chart

Common fractional inch values and their equivalents in in. Useful for machining, woodworking, drill bits, and precision measurements.

Fractions of an inch (1/64″ to 1″)
Fraction (in) Decimal (in) in
1/64″ 0.0156 0.0156
1/32″ 0.0313 0.0313
3/64″ 0.0469 0.0469
1/16″ 0.0625 0.0625
5/64″ 0.0781 0.0781
3/32″ 0.0938 0.0938
7/64″ 0.1094 0.1094
1/8″ 0.1250 0.1250
9/64″ 0.1406 0.1406
5/32″ 0.1563 0.1563
11/64″ 0.1719 0.1719
3/16″ 0.1875 0.1875
13/64″ 0.2031 0.2031
7/32″ 0.2188 0.2188
15/64″ 0.2344 0.2344
1/4″ 0.2500 0.2500
17/64″ 0.2656 0.2656
9/32″ 0.2813 0.2813
19/64″ 0.2969 0.2969
5/16″ 0.3125 0.3125
21/64″ 0.3281 0.3281
11/32″ 0.3438 0.3438
23/64″ 0.3594 0.3594
3/8″ 0.3750 0.3750
25/64″ 0.3906 0.3906
13/32″ 0.4063 0.4063
27/64″ 0.4219 0.4219
7/16″ 0.4375 0.4375
29/64″ 0.4531 0.4531
15/32″ 0.4688 0.4688
31/64″ 0.4844 0.4844
1/2″ 0.5000 0.5000
33/64″ 0.5156 0.5156
17/32″ 0.5313 0.5313
35/64″ 0.5469 0.5469
9/16″ 0.5625 0.5625
37/64″ 0.5781 0.5781
19/32″ 0.5938 0.5938
39/64″ 0.6094 0.6094
5/8″ 0.6250 0.6250
41/64″ 0.6406 0.6406
21/32″ 0.6563 0.6563
43/64″ 0.6719 0.6719
11/16″ 0.6875 0.6875
45/64″ 0.7031 0.7031
23/32″ 0.7188 0.7188
47/64″ 0.7344 0.7344
3/4″ 0.7500 0.7500
49/64″ 0.7656 0.7656
25/32″ 0.7813 0.7813
51/64″ 0.7969 0.7969
13/16″ 0.8125 0.8125
53/64″ 0.8281 0.8281
27/32″ 0.8438 0.8438
55/64″ 0.8594 0.8594
7/8″ 0.8750 0.8750
57/64″ 0.8906 0.8906
29/32″ 0.9063 0.9063
59/64″ 0.9219 0.9219
15/16″ 0.9375 0.9375
61/64″ 0.9531 0.9531
31/32″ 0.9688 0.9688
63/64″ 0.9844 0.9844
1″ 1.0000 1.0000
Whole inches (2″ to 12″)
Inches in
2″ 2.0000
3″ 3.0000
4″ 4.0000
5″ 5.0000
6″ 6.0000
7″ 7.0000
8″ 8.0000
9″ 9.0000
10″ 10.000
11″ 11.000
12″ 12.000

Bold rows indicate common fractions (1/8, 1/4, 3/8, 1/2, etc.). The conversion factor 1 inch = 25.4 mm is exact by international definition.

Common Inch to Inch Conversions

Inch to Inch (Part 1)
Inch Inch Actions
1 inch 1 inch
5 inches 5 inches
10 inches 10 inches
25 inches 25 inches
Inch to Inch (Part 2)
Inch Inch Actions
50 inches 50 inches
100 inches 100 inches
500 inches 500 inches
1000 inches 1000 inches

Inches to inches Conversion Table

Reference table with common inches to inches conversions. All values calculated with high precision.

Inches to Inches Table
0.0001 to 12

Inches Inches Actions
0.0001 in 0.0001 in
0.00025 in 0.00025 in
0.0005 in 0.0005 in
0.001 in 0.001 in
0.0025 in 0.0025 in
0.005 in 0.005 in
0.01 in 0.01 in
0.025 in 0.025 in
0.05 in 0.05 in
0.1 in 0.1 in
14 in 14 in
12 in 12 in

Inches to Inches Table
1 to 100000

Inches Inches Actions
1 in 1 in
2 12 in 2 12 in
5 in 5 in
10 in 10 in
25 in 25 in
50 in 50 in
100 in 100 in
250 in 250 in
500 in 500 in
1000 in 1000 in
2500 in 2500 in
5000 in 5000 in
10000 in 10000 in
25000 in 25000 in
50000 in 50000 in
100000 in 100000 in

Inches to Inches Table
0.0001 to 12

Inches Inches Actions
0.0001 in 0.0001 in
0.00025 in 0.00025 in
0.0005 in 0.0005 in
0.001 in 0.001 in
0.0025 in 0.0025 in
0.005 in 0.005 in
0.01 in 0.01 in
0.025 in 0.025 in
0.05 in 0.05 in
0.1 in 0.1 in
14 in 14 in
12 in 12 in

Inches to Inches Table
1 to 100000

Inches Inches Actions
1 in 1 in
2 12 in 2 12 in
5 in 5 in
10 in 10 in
25 in 25 in
50 in 50 in
100 in 100 in
250 in 250 in
500 in 500 in
1000 in 1000 in
2500 in 2500 in
5000 in 5000 in
10000 in 10000 in
25000 in 25000 in
50000 in 50000 in
100000 in 100000 in

Definition of Inch

Definition
Imperial/US customary unit standardized as exactly 25.4 millimeters since 1959.
Exact factor
1 in = 25.4 mm = 2.54 cm
Sources
NIST SP 811

Definition of Inch

Definition
Imperial/US customary unit standardized as exactly 25.4 millimeters since 1959.
Exact factor
1 in = 25.4 mm = 2.54 cm
Sources
NIST SP 811

About the Inch

Facts & Uses

  • Dominant in US construction, plumbing (pipe diameters), electronics (screen sizes), and hardware (screws, bolts).
  • Screen technology: TVs, monitors, phones measured diagonally in inches; DPI (dots per inch) defines display resolution.
  • Fractional system in construction: 1/2", 1/4", 1/8", 1/16" for precise fitting; decimal inches in engineering and machining.
  • Paper sizes: US letter 8.5 × 11 inches, legal 8.5 × 14 inches; tire dimensions use inches for rim diameter.

Curiosities

  • Historical origin: three barleycorns placed end-to-end; width of adult thumb at knuckle.
  • Exactly 25.4 mm since 1959 international agreement, ending slight variations between countries.
  • Symbol "" (double prime) distinguishes from feet (') in architectural and engineering drawings.
  • Smartphone screens paradox: measured diagonally in inches despite metric internal components and manufacturing.

Sources

Frequently Asked Questions

How many inches are in one inch?

One inch equals 1 inches. To convert, multiply the inch value by 1. For the reverse, divide the inch value by 1 (or multiply by 1).

What is 0.12 inches in inches?

0.12 inches = 0.12 inches. This is one of the most commonly searched conversions for this pair.

How precise is the inch-to-inch conversion?

The factor 1 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.

Looking for the reverse? Convert Inch to Inch

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Conversion factors verified against NIST, BIPM, ISO 80000-3 1 inch = 2.54 cm by international agreement (1959). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.