20 mm Is How Many Inches? Conversion Chart and Ruler Guide

20 millimeters equals 0.7874 inches. If you round this number to two decimal places, the result is 0.79 inches. Its closest common fraction at 1/32-inch precision is 25/32 inch.

This measurement is useful when checking product sizes, tools, hardware, and other small objects. You can also find it on a ruler between the 3/4-inch and 13/16-inch marks.

This guide explains the conversion formula, fractional value, ruler position, and other useful measurements.

Quick Conversion: 20 Millimeters to Inches

Here is a quick look at the main conversion results.

Measurement	Equivalent
Millimeters	20 mm
Decimal inches	0.7874 inches
Rounded inches	0.79 inches
Closest fraction at 1/32 precision	25/32 inch
Centimeters	2 cm
Feet	0.06562 ft
Meters	0.02 m

One inch is equal to 25.4 millimeters. This value is the standard conversion factor for changing metric measurements into inches.

Fractional Inch Equivalent

Some US measuring tools show fractions instead of decimal numbers. For this reason, it helps to know the closest fractional value.

The decimal result is 0.7874 inches. The closest common fraction at 1/32-inch precision is 25/32 inch.

Fraction	Decimal Value
1/2 inch	0.5000
5/8 inch	0.6250
3/4 inch	0.7500
25/32 inch	0.78125
13/16 inch	0.8125
7/8 inch	0.8750
1 inch	1.0000

The exact measurement is slightly larger than 25/32 inch and smaller than 13/16 inch.

Finding the Measurement on a Ruler

A standard inch ruler may not have a mark for every millimeter. However, you can find the approximate position by looking between two nearby marks.

• 3/4 inch equals 0.7500 inches.
• 13/16 inch equals 0.8125 inches.

The measurement falls between these two marks. It is closer to 13/16 inch.

Follow these steps:

1. Place one end of the object at zero.
2. Find the 3/4-inch mark.
3. Look at the next 1/16-inch mark.
4. This mark is 13/16 inch.
5. The required point falls between these two marks.

A metric ruler is better when you need an exact 20 mm reading. An inch ruler gives an approximate position.

How to Convert Millimeters into Inches

You can change any millimeter measurement into inches with a simple formula.

Conversion formula:

Inches = Millimeters ÷ 25.4

For this example:

20 ÷ 25.4 = 0.7874015748

After rounding to four decimal places:

20 mm = 0.7874 inches

You can use this formula with a calculator. Just enter the millimeter value and divide it by 25.4.

Centimeters, Feet, and Other Units

The same metric measurement can be shown in several units. Here are the equivalent values.

Unit	Equivalent
Inches	0.7874 in
Centimeters	2 cm
Feet	0.06562 ft
Meters	0.02 m
Yards	0.02187 yd

To convert millimeters into centimeters, divide by 10. To convert them into feet, divide by 304.8.

Millimeter to Inch and Feet Chart

Use this chart to compare common measurements. All decimal values are rounded.

Millimeters	Inches	Feet
5 mm	0.1969	0.01640
6 mm	0.2362	0.01969
8 mm	0.3150	0.02625
10 mm	0.3937	0.03281
12 mm	0.4724	0.03937
15 mm	0.5906	0.04921
18 mm	0.7087	0.05906
19 mm	0.7480	0.06234
20 mm	0.7874	0.06562
21 mm	0.8268	0.06890
22 mm	0.8661	0.07218
25 mm	0.9843	0.08202
30 mm	1.1811	0.09843
40 mm	1.5748	0.13123
50 mm	1.9685	0.16404

Other Common Millimeter Conversions

You may need to convert other measurements when comparing product sizes or reading a measurement chart.

25 mm in Inches

25 mm equals approximately 0.9843 inches. It is slightly smaller than one inch.

Calculation:

25 ÷ 25.4 = 0.9843 inches

Measurement Ranges in Inches

Sometimes a product or object has a size range instead of one exact measurement.

Millimeter Range	Inch Range
10 to 20 mm	0.3937 to 0.7874 inches
15 to 20 mm	0.5906 to 0.7874 inches
20 to 30 mm	0.7874 to 1.1811 inches
20 to 40 mm	0.7874 to 1.5748 inches

For example, a range of 15 to 20 mm starts at about 0.59 inches and ends at about 0.79 inches.

200 mm and 2,000 mm in Inches

Larger values use the same conversion formula.

Millimeters	Inches
200 mm	7.8740
2,000 mm	78.7402

Always check the number of zeros before calculating. A small change in the number can make a large difference in the result.

201 mm to 208 mm in Inches

Here are the conversions for several nearby measurements.

Millimeters	Inches
201 mm	7.9134
202 mm	7.9528
203 mm	7.9921
204 mm	8.0315
205 mm	8.0709
206 mm	8.1102
207 mm	8.1496
208 mm	8.1890

Each result is rounded to four decimal places.

What Is 0.20 mm in Inches?

Be careful not to confuse 0.20 mm with 20 mm. These are two different measurements.

To convert 0.20 mm:

0.20 ÷ 25.4 = 0.007874

Therefore, 0.20 mm equals approximately 0.0079 inches.

This is a very small measurement.

How Large Is This Measurement?

A length of 20 mm is equal to 2 centimeters. It is also a little less than 0.8 inches.

Here are a few simple facts:

• It is smaller than one inch.
• It is slightly less than 13/16 inch.
• It equals 2 centimeters.
• It is about 0.79 inches.
• It is 5.4 mm shorter than one inch.

This size may appear in small tools, hardware, jewelry parts, and product dimensions.

Converting a 20 mm x 20 mm Size

A product marked 20 mm x 20 mm has a length and width of 20 millimeters each.

Convert both sides:

• Length: 20 ÷ 25.4 = 0.7874 inches.
• Width: 20 ÷ 25.4 = 0.7874 inches.

Therefore, the size is approximately 0.7874 x 0.7874 inches.

This is helpful when comparing product specifications that use metric and US customary units.

Rainfall Measurement

Rainfall can be measured in millimeters or inches.

A rainfall amount of 20 mm equals approximately 0.7874 inches. Rounded to two decimal places, it is 0.79 inches.

This makes it slightly less than 0.8 inches of rain.

Frequently Asked Questions

Conclusion

20 mm equals 0.7874 inches, or about 0.79 inches. Its closest common fraction at 1/32-inch precision is 25/32 inch.

On a standard US ruler, it falls between 3/4 inch and 13/16 inch. The easiest way to convert millimeters into inches is to divide by 25.4.

You can use the formula and charts in this guide to convert other metric measurements as well.