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30 cm to Inches

30 centimeters equals 11.8110 inches — about 11 13/16″ on a tape measure.

Conversion factor
1 cm = 0.393700787402 in
Millimeters
300 mm
30 cm =11.811 in11.811 inches

Show the work

  1. in = cm × 0.393700787402
  2. 30 × 0.393700787402 = 11.811 in
  3. Equivalently, because 1 in is exactly 2.54 cm: 30 ÷ 2.54 = 11.811 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

30 cm at a glance

Inches
11.8110 in
Nearest 1/16 in
11 13/16 in
Nearest 1/8 in
11 3/4 in
Feet & inches
11.81 in (under 1 ft)
Millimeters
300 mm
Meters
0.3 m

How to convert 30 cm to inches

inches = cm ÷ 2.54
30 ÷ 2.54 = 11.811024 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: 30 × 0.4 = 12 in. That overshoots by 0.19 in (about 1.6%) — fine for a rough check, but noticeable on longer lengths.

Reading 30 cm on an inch tape measure

US rulers mark fractions of an inch rather than decimals. Here is 11.8110 in rounded to each common mark, with the error that rounding introduces:

PrecisionTape-measure readingError
1/2 in12 in+4.80 mm
1/4 in11 3/4 in−1.55 mm
1/8 in11 3/4 in−1.55 mm
1/16 in11 13/16 in+0.04 mm
1/32 in11 13/16 in+0.04 mm
30 cm = 11.81 in0510152025300123456789101112cmin
30 cm = 11.81 in on a dual-scale ruler: centimeters along the top edge, inches along the bottom.

Things about 30 cm long

  • About the same as the long side of an A4 sheet, 29.7 cm (11.69 in).
  • About the same as a standard 12-inch ruler, 30.48 cm (12 in).
  • 7% longer than the long side of US letter paper, 27.94 cm (11 in).
  • Paper and screens. 30 cm is 11.81 in — 0.81 in more than the length of US letter paper.
  • Carry-on bags. Most US airlines limit carry-ons to 22 × 14 × 9 in, about 56 × 36 × 23 cm, so 30 cm fits the width but not the depth limit.

Centimeters near 30 cm

CentimetersInchesNearest 1/16 in
25 cm9.8425 in9 13/16 in
26 cm10.2362 in10 1/4 in
27 cm10.6299 in10 5/8 in
28 cm11.0236 in11 in
29 cm11.4173 in11 7/16 in
30 cm11.811 in11 13/16 in
31 cm12.2047 in12 3/16 in
32 cm12.5984 in12 5/8 in
33 cm12.9921 in13 in
34 cm13.3858 in13 3/8 in
35 cm13.7795 in13 3/4 in

Going the other way: 12 inches to cm is exactly 30.48 cm.

Frequently asked questions

How many inches is 30 cm?

30 cm is 11.81 inches (11.8110 to four places), found by dividing 30 by 2.54.

What is 30 cm in inches as a fraction?

To the nearest sixteenth, 30 cm is 11 13/16 in; to the nearest eighth it is 11 3/4 in.

Is 30 cm bigger than an inch?

Yes. 30 cm is 11.81 in, because one inch is only 2.54 cm.

How do I convert 30 cm to inches without a calculator?

Multiply by 0.4 for a quick estimate (12 in), then shave off about 1.6% to get close to the exact 11.81 in.

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