# How many cm in an inch ruler: Converting Size Made Simple!

How many cm in an inch ruler: Converting Size Made Simple!

When it comes to measuring length, width, or height, rulers are some of the most commonly used instruments. Most rulers are designed either in inches or centimeters with some rulers that have both measurements. As a result, there are times when we have to convert from inches to cm, or vice versa. This article focuses on ‘How many cm in an inch ruler’ – the basic conversion formula and the most common questions people ask about converting size measurements.

## Inch and cm Ruler – What’s the Difference?

The most common measuring units for length are the inch and centimeter (cm). Both units of measurement can be used to measure a wide range of objects, including but not limited to building materials, clothing, and food products. The significant difference between the two is their length.

While an inch is a unit of length equal to 1/12th of a foot or 2.54cm in modern times, the centimeter (cm) is a unit of length in the International System of Units (SI) that is equal to one-hundredth of a meter. One meter is approximately equal to 39.37 inches. Therefore, the difference between both rulers’ measurements is that the inch measures a greater length than the cm.

### The Inch Ruler

Using an inch ruler is quite simple. There are 12 inches in one foot and 36 inches in a yard. Inches have several subdivisions, with the most common being 1/4 inch, 1/8 inch, 1/16 inch, and 1/32 inch. The smallest marking on a standard ruler is usually 1/16 inch.

Here’s an illustration of an inch ruler with its various subdivisions.

1 Inch Ruler
|–|–|–|–| 0 1 2 3 4 5 6 7 8 9 10 11
Note: Each dash indicates 1 inch on the ruler. There are a total of 12 dashes on a ruler, representing 12 inches
1
2
3
4
5
6
7
8
9
10
11
12

### The Cm Ruler

Unlike the inch ruler, the centimeter ruler has ten subdivisions in every centimeter. These subdivisions are usually marked as millimeters – 1/10 of a centimeter. The smallest marking on a standard cm ruler is usually .1cm or 1 millimeter, represented by a small line. Depending on the ruler, some can have up to three decimal places.

Here’s an illustration of a cm ruler with its various subdivisions.

1 Cm Ruler
|––––|––––|––––|––––|––––|––––|––––|––––|––––|––––| 0 1 2 3 4 5 6 7 8 9 10
Note: Each dash represents 1cm. A total of ten dashes make up 1cm
1cm (+1mm)  |
2cm (+2mm)  |
3cm (+3mm)  |
4cm (+4mm)  |
5cm (+5mm)  |
6cm (+6mm)  |
7cm (+7mm)  |
8cm (+8mm)  |
9cm (+9mm)  |
10cm  |

## How to Convert Inches to Cm?

The process of converting inches to cm is quite simple.

You need to understand that one inch is exactly equal to 2.54 centimeters. Therefore, to convert inches to centimeters, you can multiply the number of inches by 2.54.

### Example:

• Convert 6 inches to cm.

Step 1: Multiply 6 (the number of inches) by 2.54 (the conversion factor).

6 x 2.54 = 15.24cm

Therefore, 6 inches is equal to 15.24 centimeters

## How to Convert Cm to Inches?

The process of converting cm to inches is also quite simple.

You need to understand that one centimeter is exactly equal to 0.3937 inches. Therefore, to convert from cm to inches, you can divide the number of centimeters by 2.54.

### Example:

• Convert 20cm to inches.

Step 1: Divide 20 (the number of centimeters) by 2.54 (the conversion factor).

20 ÷ 2.54 = 7.874 inches (rounded off to 3 decimal places)

Therefore, 20cm is equal to 7.874 inches

## Common Questions About Converting Inches to Cm

### 1. How many centimeters are in an inch ruler?

One inch ruler is exactly equal to 2.54 centimeters.

### 2. Can I use an inch ruler to measure in cm?

Yes, you can use an inch ruler to measure in cm. You only need to convert the inches to centimeters using the conversion factor – 1 inch = 2.54cm.

### 3. How many mm are in an inch ruler?

There are 25.4 millimeters (mm) in one inch ruler.

### 4. How do I measure in fractions of an inch?

On an inch ruler, there are several subdivisions that allow you to measure in fractions of an inch such as 1/4 inch, 1/8 inch, 1/16 inch, and 1/32 inch.

### 5. What is the size of a standard inch ruler?

Most standard inch rulers are 12 inches long and 1 inch wide.

### 6. Can I use a cm ruler to measure in inches?

Yes, you can use a cm ruler to measure in inches. You only need to convert the centimeters to inches using the conversion factor – 1cm = 0.3937 inches.

## Conclusion

Converting inches to centimeters or vice versa can seem like a daunting task. However, it is quite simple and can be done using a basic conversion formula. Understanding the difference between the inch and cm ruler, as well as knowing the most common questions about converting size measurements, can simplify the process of measuring and help you get more accurate results.

## References

[1] “What is an inch and centimeter?” World Standards.

[2] “The International System of Units (SI)” International System of Units.

[3] “Inch” Wikipedia.

[4] “Centimetre” Wikipedia.

• How many centimeters in an inch ruler?
• Can I use an inch ruler to measure in cm?
• How many mm are in an inch ruler?
• How do I measure in fractions of an inch?
• What is the size of a standard inch ruler?
• Can I use a cm ruler to measure in inches?