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How To Convert From Cm To Inches (And Back)

Updated on May 28, 2012

Learn how to convert from cm to inches and backward from inches to cm. This conversion is quite simple and easy to comprehend. I will show you basic formulas for better understanding of relation between measurement units. In addition you can find here practical examples for using formulas and many links to online converters.


1 Inch = 2.54 Centimeters


Inches x 2.54 = Centimeters


1 Centimeter = 0.3937* Inches


Centimeters x 0.3937* = Inches

* exact number is 0.393700787



Name: inch (inches)

Acronym: in (or double prime - " )

Description: an inch is universal unit of length in Imperial Unit System, it is used in UK, US, Canada and informal in Australia. Other measurement units are 1 foot = 12 inches and 1 yard = 36 inches.

Detail about measurement units


Name: centimeter (centimeters)

Acronym: cm

Description: a centimeter is unit of length in International System of Units (SI) - metric system. It is widely used in Europe and in many nations as official measurement system. More commonly used units are 1 millimeter = 0.1 centimeters, 1 meter = 100 centimeters.

In this list you can see most used values for cm and inches. Inches are multiplied by 2.54 and centimeters by 0.3937 (above is exact number, if you need mathematicalprecise results). Final numbers are rounded up (two decimal figures).

Convert cm to inches

20 cm = 7.87 in

30 cm = 11.81 in

40 cm = 15.75 in (or 1 foot and 3.75 in)

50 cm = 19.69 in (or 1 foot and 7.69 in)

60 cm = 23.62 in (or 1 foot and 11.62 in)

70 cm = 27.56 in (or 2 feet and 3.56 in)

80 cm = 31.50 in (or 2 feet and 7.50 in)

90 cm = 35.43 in (or 2 feet and 11.43 in)

100 cm = 39.37 in (or 3 feet and 3.37 in)

1 cm = 0.39 in

1,5 cm = 0.59 in

2 cm = 0.79 in

2,5 cm = 0.98 in

3 cm = 1.18 in

3,5 cm = 1.38 in

4 cm = 1.57 in

4,5 cm = 1.77 in

5 cm = 1.97 in

5,5 cm = 2.17 in

6 cm = 2.36 in

6,5 cm = 2.56 in

7 cm = 2.76 in

7,5 cm = 2.95 in

8 cm = 3.15 in

8,5 cm = 3.35 in

9 cm = 3.54 in

9,5 cm = 3.74 in

10 cm = 3.94 in

Convert inches to cm

20 in = 50.80 cm (or 0.51 meters)

30 in = 76.20 cm (or 0.76 meters)

40 in = 101.60 (or 1.02 meters)

50 in = 127.00 (or 1.27 meters)

60 in = 152.40 (or 1.52 meters)

70 in = 177.80 (or 1.78 meters)

80 in = 203.20 (or 2.03 meters)

90 in = 228.60 (or 2.29 meters)

100 in = 254.00 (or 2.54 meters)

1 in = 2.54 cm

1 ¼ in = 3.18 cm

1 ½ in = 3.81 cm

1 ¾ in = 4.45 cm

2 in = 5.08 cm

2 ¼ in = 5.72 cm

2 ½ in = 6.35 cm

2 ¾ in = 6.99 cm

3 in = 7.62 cm

3 ¼ in = 8.26 cm

3 ½ in = 8.89 cm

3 ¾ in = 9.53 cm

4 in = 10.16 cm

4 ¼ in = 10.80 cm

4 ½ in = 11.43 cm

4 ¾ in = 12.07 cm

5 in = 12.70 cm

5 ¼ in = 13.34 cm

5 ½ in = 13.97 cm

5 ¾ in = 14.61 cm

6 in = 15.24 cm

6 ¼ in = 15.88 cm

6 ½ in = 16.51 cm

6 ¾ in = 17.15 cm

7 in = 17.78 cm

7 ¼ in = 8.42 cm

7 ½ in = 19.05 cm

7 ¾ in = 19.69 cm

8 in = 20.32 cm

8 ¼ in = 20.96 cm

8 ½ in = 21.59 cm

8 ¾ in = 22.23 cm

9 in = 22.86 cm

9 ¼ in = 23.50 cm

9 ½ in = 24.13 cm

9 ¾ in = 24.77 cm

10 in = 25.40 cm

Practical examples

In following practical examples notice that for conversion from centimeters to inches I have used calculative shorter formula. Centimeters are multiplied by 0.3937 instead of 0.393700787. therefore your final results may vary. Shorter form can be less time-consuming to the prejudice of exactness.

If a man is 180 centimeters tall what is his height in inches?

180 cm x 0.3937 = 70.866 in

My daughter is 55 centimeters long and I would like to convert it to inches.

56 cm x 0.3937 = 22.0472 (or approximately 22 in)

How many centimeters are in 42 inches digital tv?

42 in x 2.54 = 106.68 cm

How wide is 10 inches iPad's screen in centimeters?

10 in x 2.54 = 25.4 cm

How to convert from cm to inches with online convertors

Today you can find out a lot of online converters. I have prepared list of handy and clever conversion calculators. Some converters calculate with besides inches with feet too. Here are top 10 online converters.

Example of usage: write down “50 in to cm” and you will get “50 inches = 127 centimeters”. You will get very fast results. It is best way how to convert inches to cm online. You can use it as combination with google toolbar and then you just write your conversion formula to the toolbar and it is. For more conversion tips see Google GuideCalculator.

Videos How To Convert From Cm To Inches

If you prefer videos check these video tutorial and you can test your new mathematical skill with quizzes.

Converting Inches to Centimeters

Conversion Quiz - How to Convert Centimeters to Inches

Conversion Quiz - How to Convert Inches to Centimeters

If you like my article How To Convert From Cm To Inches (And Back) please share, rate or comment it. If you have some ideas to improve this article, please feel free to contact me. I hope that I helped you with this conversion and you can easy to practical use in your daily life.


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    • profile image


      15 months ago

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    • profile image

      Drake Frost 

      20 months ago

      According to the formula for a very long time to do such a translation. Better use online convector

    • naaz simra profile image

      naaz simra 

      21 months ago from United Kingdom

      Thanks for sharing this useful information

      You can also try to convert all metric measurements

    • profile image


      6 years ago

      0.393700787in = 1cm is not true, that is not the exact value. 2.54cm = 1in is exact because the inch has been defined that way to derive from the metric system. if you check, 0.393700787 * 254/100 actually gives 0.99999999898 where it would give precisely 1 if the approximation = 1cm was exactly true.

    • Missy Mac profile image

      Missy Mac 

      7 years ago from Illinois

      Using proportions is a great way to convert inches to cm. I am using this information. Additionally, thank you for the conversion chart at the top and clear explanation.

    • profile image


      7 years ago


    • profile image

      Fagg Fai 

      7 years ago

      I Really Like it but you got too Hard so I didn't did the quiz but VERY GOOD TRY


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