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1 cm to Inches

1 centimeters equals 0.3937 inches — about 3/8″ on a tape measure.

Conversion factor
1 cm = 0.393700787402 in
Millimeters
10 mm
1 cm =0.3937 in0.3937 inches

Show the work

  1. in = cm × 0.393700787402
  2. 1 × 0.393700787402 = 0.3937 in
  3. Equivalently, because 1 in is exactly 2.54 cm: 1 ÷ 2.54 = 0.3937 in
Centimeter to inch conversion table
cminft & in
10.39370.4 in
20.78740.8 in
31.18111.2 in
41.57481.6 in
51.96852 in
103.9373.9 in
155.90555.9 in
207.8747.9 in
259.84259.8 in
3011.81111.8 in
4015.7481 ft 3.7 in
5019.6851 ft 7.7 in
6023.6221 ft 11.6 in
7027.55912 ft 3.6 in
7529.52762 ft 5.5 in
8031.49612 ft 7.5 in
9035.43312 ft 11.4 in
10039.37013 ft 3.4 in
12047.24413 ft 11.2 in
14055.11814 ft 7.1 in
15059.05514 ft 11.1 in
15561.02365 ft 1 in
16062.99215 ft 3 in
16564.96065 ft 5 in
17066.92915 ft 6.9 in
17568.89765 ft 8.9 in
18070.86615 ft 10.9 in
18572.83466 ft 0.8 in
19074.80316 ft 2.8 in
19576.77176 ft 4.8 in
20078.74026 ft 6.7 in

1 cm at a glance

Inches
0.3937 in
Nearest 1/16 in
3/8 in
Nearest 1/8 in
3/8 in
Feet & inches
0.39 in (under 1 ft)
Millimeters
10 mm
Meters
0.01 m

How to convert 1 cm to inches

inches = cm ÷ 2.54
1 ÷ 2.54 = 0.393701 in

The inch has been defined as exactly 2.54 cm since 1959, so dividing by 2.54 is exact; the long decimal is just what that division produces. Multiplying by 0.3937 gives the same answer to four places.

Quick estimate

Multiply by 4 and divide by 10: 1 × 0.4 = 0.4 in. That overshoots by 0.01 in (about 1.6%) — fine for a rough check.

Reading 1 cm on an inch tape measure

US rulers mark fractions of an inch rather than decimals. Here is 0.3937 in rounded to each common mark, with the error that rounding introduces:

PrecisionTape-measure readingError
1/2 in1/2 in+2.70 mm
1/4 in1/2 in+2.70 mm
1/8 in3/8 in−0.47 mm
1/16 in3/8 in−0.47 mm
1/32 in13/32 in+0.32 mm
1 cm = 0.39 in0120cmin
1 cm = 0.39 in on a dual-scale ruler: centimeters along the top edge, inches along the bottom.

Things about 1 cm long

  • About 56% of the diameter of a US dime, 1.79 cm (0.71 in).
  • About 52% of the diameter of a US penny, 1.91 cm (0.75 in).
  • About 47% of the diameter of a US nickel, 2.12 cm (0.84 in).
  • Hardware and crafts. US bolts, drill bits and beads are sized in fractions of an inch, so 1 cm is shopped as roughly 3/8 in (10 mm on metric parts).

Centimeters near 1 cm

CentimetersInchesNearest 1/16 in
1 cm0.3937 in3/8 in
2 cm0.7874 in13/16 in
3 cm1.1811 in1 3/16 in
4 cm1.5748 in1 9/16 in
5 cm1.9685 in1 15/16 in
6 cm2.3622 in2 3/8 in

Frequently asked questions

How many inches is 1 cm?

1 cm is 0.39 inches (0.3937 to four places), found by dividing 1 by 2.54.

What is 1 cm in inches as a fraction?

To the nearest sixteenth, 1 cm is 3/8 in; to the nearest eighth it is 3/8 in.

Is 1 cm bigger than an inch?

No. 1 cm is 0.394 in, less than one inch (2.54 cm).

How do I convert 1 cm to inches without a calculator?

Multiply by 0.4 for a quick estimate (0.4 in), then shave off about 1.6% to get close to the exact 0.39 in.

Need a different value? Use the CM to inches converter, or browse the CM to inches chart.