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4 cm to Inches

4 centimeters equals 1.5748 inches — about 1 9/16″ on a tape measure.

Conversion factor
1 cm = 0.393700787402 in
Millimeters
40 mm
4 cm =1.5748 in1.5748 inches

Show the work

  1. in = cm × 0.393700787402
  2. 4 × 0.393700787402 = 1.5748 in
  3. Equivalently, because 1 in is exactly 2.54 cm: 4 ÷ 2.54 = 1.5748 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

4 cm at a glance

Inches
1.5748 in
Nearest 1/16 in
1 9/16 in
Nearest 1/8 in
1 5/8 in
Feet & inches
1.57 in (under 1 ft)
Millimeters
40 mm
Meters
0.04 m

How to convert 4 cm to inches

inches = cm ÷ 2.54
4 ÷ 2.54 = 1.574803 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: 4 × 0.4 = 1.6 in. That overshoots by 0.03 in (about 1.6%) — fine for a rough check.

Reading 4 cm on an inch tape measure

US rulers mark fractions of an inch rather than decimals. Here is 1.5748 in rounded to each common mark, with the error that rounding introduces:

PrecisionTape-measure readingError
1/2 in1 1/2 in−1.90 mm
1/4 in1 1/2 in−1.90 mm
1/8 in1 5/8 in+1.28 mm
1/16 in1 9/16 in−0.31 mm
1/32 in1 9/16 in−0.31 mm
4 cm = 1.57 in01234501cmin
4 cm = 1.57 in on a dual-scale ruler: centimeters along the top edge, inches along the bottom.

Things about 4 cm long

  • 6% shorter than the minimum diameter of a golf ball, 4.27 cm (1.68 in).
  • 21% shorter than the length of an AA battery, 5.05 cm (1.99 in).
  • 26% shorter than the short side of a credit card, 5.4 cm (2.13 in).
  • Hardware and crafts. US bolts, drill bits and beads are sized in fractions of an inch, so 4 cm is shopped as roughly 1 9/16 in (40 mm on metric parts).

Centimeters near 4 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
7 cm2.7559 in2 3/4 in
8 cm3.1496 in3 1/8 in
9 cm3.5433 in3 9/16 in

Going the other way: 2 inches to cm is exactly 5.08 cm.

Frequently asked questions

How many inches is 4 cm?

4 cm is 1.57 inches (1.5748 to four places), found by dividing 4 by 2.54.

What is 4 cm in inches as a fraction?

To the nearest sixteenth, 4 cm is 1 9/16 in; to the nearest eighth it is 1 5/8 in.

Is 4 cm bigger than an inch?

Yes. 4 cm is 1.57 in, because one inch is only 2.54 cm.

How do I convert 4 cm to inches without a calculator?

Multiply by 0.4 for a quick estimate (1.6 in), then shave off about 1.6% to get close to the exact 1.57 in.

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