If you want to know 20 mm equals how many inches, the answer is 0.7874 inches. Rounded to two decimal places, it equals 0.79 inches.
You can also write 20mm as about 25/32 inch. This is the closest common 1/32-inch fraction, but it is not an exact match.
This guide explains how to convert 20 millimeters to inches. You will also learn its fraction, centimeter value, feet value, and other useful measurements.
How Many Inches Does 20mm Equal?
20 millimeters equals about 0.7874 inches.
Here are the main conversion results:
| Measurement | Result |
|---|---|
| 20mm in inches | 0.7874015748 |
| Rounded to 4 decimal places | 0.7874 inches |
| Rounded to 3 decimal places | 0.787 inches |
| Rounded to 2 decimal places | 0.79 inches |
| 20mm in centimeters | 2cm |
| 20mm in feet | 0.06562 feet |
One inch contains exactly 25.4 millimeters. This is the standard value used for metric-to-inch conversion.
20mm to Inches as a Fraction
Many people use fractions instead of decimal numbers when measuring with an inch ruler or tape measure.
20mm is closest to 25/32 inch on a common 1/32-inch scale.
Here is how nearby fractions compare:
| Inch Fraction | Decimal Inches | Millimeters |
|---|---|---|
| 1/2 inch | 0.5000 | 12.7mm |
| 5/8 inch | 0.6250 | 15.875mm |
| 3/4 inch | 0.7500 | 19.05mm |
| 25/32 inch | 0.78125 | 19.84375mm |
| 13/16 inch | 0.8125 | 20.6375mm |
| 7/8 inch | 0.8750 | 22.225mm |
| 1 inch | 1.0000 | 25.4mm |
The closest common fraction is 25/32 inch. The actual value of 20mm is about 0.7874 inches, so the fraction is only an approximation.
How to Convert 20mm to Inches
You can convert millimeters to inches with a simple formula.
Formula:
Inches = Millimeters ÷ 25.4
Follow these steps:
- Start with 20 millimeters.
- Divide 20 by 25.4.
- The answer is 0.7874015748.
- Round the answer to 0.7874 inches.
So, 20mm equals approximately 0.7874 inches.
You can use this formula for any millimeter value. Just divide the number by 25.4.
Why Do We Divide by 25.4?
The metric system uses millimeters, centimeters, and meters. The imperial system uses inches, feet, and yards.
One inch is exactly 25.4 millimeters. This means you must divide a millimeter value by 25.4 to find its value in inches.
For example:
- 10mm ÷ 25.4 = 0.3937 inches
- 20mm ÷ 25.4 = 0.7874 inches
- 25mm ÷ 25.4 = 0.9843 inches
- 50mm ÷ 25.4 = 1.9685 inches
This method works for small and large measurements.
20mm on a Ruler
On a metric ruler, 20mm is the same as 2 centimeters.
On an inch ruler, 20mm is about 0.7874 inches. It falls between the 3/4-inch and 13/16-inch marks.
- 3/4 inch = 0.75 inches
- 20mm = 0.7874 inches
- 13/16 inch = 0.8125 inches
It is closest to the 25/32-inch mark.
A metric ruler shows millimeters and centimeters. An inch ruler shows inches and smaller fraction marks. Both rulers can measure the same length.
20mm to Inches Conversion Chart
Use this chart to convert common millimeter values into decimal inches.
| Millimeters | Inches |
|---|---|
| 1mm | 0.0394 |
| 2mm | 0.0787 |
| 5mm | 0.1969 |
| 6mm | 0.2362 |
| 8mm | 0.3150 |
| 10mm | 0.3937 |
| 12mm | 0.4724 |
| 15mm | 0.5906 |
| 18mm | 0.7087 |
| 19mm | 0.7480 |
| 20mm | 0.7874 |
| 21mm | 0.8268 |
| 22mm | 0.8661 |
| 25mm | 0.9843 |
| 30mm | 1.1811 |
| 40mm | 1.5748 |
| 50mm | 1.9685 |
This chart makes it easy to compare metric measurements with inches.
Millimeters to Fractional Inches Chart
Some measuring tools use fractions instead of decimal inches. This chart shows common fractional inch values in millimeters.
| Fraction | Decimal Inches | Millimeters |
|---|---|---|
| 1/16 inch | 0.0625 | 1.5875mm |
| 1/8 inch | 0.1250 | 3.175mm |
| 3/16 inch | 0.1875 | 4.7625mm |
| 1/4 inch | 0.2500 | 6.35mm |
| 5/16 inch | 0.3125 | 7.9375mm |
| 3/8 inch | 0.3750 | 9.525mm |
| 1/2 inch | 0.5000 | 12.7mm |
| 5/8 inch | 0.6250 | 15.875mm |
| 3/4 inch | 0.7500 | 19.05mm |
| 25/32 inch | 0.78125 | 19.84375mm |
| 13/16 inch | 0.8125 | 20.6375mm |
| 7/8 inch | 0.8750 | 22.225mm |
| 1 inch | 1.0000 | 25.4mm |
These values help when you need to compare metric and fractional measurements.
What Is 20mm in Centimeters?
20mm equals 2 centimeters.
There are 10 millimeters in one centimeter. To convert millimeters to centimeters, divide by 10.
20 ÷ 10 = 2cm
So, 20 millimeters is the same as 2 centimeters.
20mm to Feet
20mm equals about 0.06562 feet.
There are 304.8 millimeters in one foot. To convert millimeters to feet, divide by 304.8.
20 ÷ 304.8 = 0.06562 feet
This is a small part of one foot.
25mm to Inches
25mm equals approximately 0.9843 inches.
Rounded to two decimal places, it is 0.98 inches. This is very close to one inch.
| Millimeters | Inches |
|---|---|
| 20mm | 0.7874 |
| 25mm | 0.9843 |
| 25.4mm | 1.0000 |
20mm x 20mm in Inches
A measurement of 20mm x 20mm has two sides. Each side equals about 0.7874 inches.
So:
- 20mm = 0.7874 inches
- 20mm x 20mm = 0.7874 x 0.7874 inches
- Area = 400 square millimeters
- Area = about 0.620 square inches
This conversion is useful for square objects, tiles, small parts, and other measurements.
15–20mm Equals How Many Inches?
A range of 15–20mm equals about 0.5906–0.7874 inches.
| Millimeters | Inches |
|---|---|
| 15mm | 0.5906 |
| 16mm | 0.6299 |
| 17mm | 0.6693 |
| 18mm | 0.7087 |
| 19mm | 0.7480 |
| 20mm | 0.7874 |
The exact result depends on the measurement you choose within this range.
20–30mm Equals How Many Inches?
A range of 20–30mm equals about 0.7874–1.1811 inches.
| Millimeters | Inches |
|---|---|
| 20mm | 0.7874 |
| 22mm | 0.8661 |
| 24mm | 0.9449 |
| 25mm | 0.9843 |
| 26mm | 1.0236 |
| 28mm | 1.1024 |
| 30mm | 1.1811 |
This range is useful when comparing different metric sizes.
How Many Inches Is 20mm of Rain?
20mm of rain equals about 0.7874 inches of rainfall.
Rainfall is measured by how deep the water would be on a flat surface. So, 20mm of rain is just under 0.8 inches.
It is slightly more than 3/4 inch, which equals 0.75 inches.
What Is 0.20mm in Inches?
0.20mm equals about 0.007874 inches.
To find the answer, divide 0.20 by 25.4.
0.20 ÷ 25.4 = 0.007874 inches
Be careful not to confuse 0.20mm with 20mm. The first value is much smaller.
How Many Millimeters Is 20 Inches?
20 inches equals 508 millimeters.
To convert inches to millimeters, multiply the inch value by 25.4.
20 × 25.4 = 508mm
So, 20 inches is much longer than 20 millimeters.
How Big Is 20 Inches?
20 inches equals 50.8 centimeters or 508 millimeters. It is 1 foot and 8 inches long.
This is a different measurement from 20mm, which equals only 0.7874 inches.
200mm to Inches and Other Nearby Values
You may also need to convert measurements close to 200mm. The following chart shows their inch values.
| Millimeters | Inches |
|---|---|
| 200mm | 7.8740 |
| 201mm | 7.9134 |
| 202mm | 7.9528 |
| 203mm | 7.9921 |
| 204mm | 8.0315 |
| 205mm | 8.0709 |
| 206mm | 8.1102 |
| 207mm | 8.1496 |
| 208mm | 8.1890 |
| 209mm | 8.2283 |
These values are rounded to four decimal places.
2000mm Equals How Many Inches?
2000mm equals about 78.7402 inches.
To convert it, divide 2000 by 25.4.
2000 ÷ 25.4 = 78.74015748 inches
Rounded to four decimal places, the answer is 78.7402 inches.
MM to Inches and Feet
You can convert millimeters into both inches and feet. Divide the millimeter value by 25.4 to get inches. Divide it by 304.8 to get feet.
| Millimeters | Inches | Feet |
|---|---|---|
| 10mm | 0.3937 | 0.03281 |
| 20mm | 0.7874 | 0.06562 |
| 25mm | 0.9843 | 0.08202 |
| 50mm | 1.9685 | 0.16404 |
| 100mm | 3.9370 | 0.32808 |
| 200mm | 7.8740 | 0.65617 |
| 500mm | 19.6850 | 1.64042 |
| 1000mm | 39.3701 | 3.28084 |
| 2000mm | 78.7402 | 6.56168 |
This table makes it easy to compare metric measurements with inches and feet.
How to Use a Millimeter to Inch Calculator
An online millimeter-to-inch calculator can give you a quick result.
Follow these steps:
- Open a millimeter-to-inch conversion calculator.
- Enter your value in the millimeter box.
- Select inches as the output unit.
- Read the result.
For example, enter 20 to get about 0.7874 inches.
You can also enter 25mm, 200mm, or 2000mm to get their inch values.
Frequently Asked Questions
20mm equals about 0.7874 inches. Rounded to two decimal places, it is 0.79 inches.
20mm is closest to 25/32 inch on a common 1/32-inch scale. This is an approximation, not an exact match.
No. 3/4 inch equals 19.05mm. A 20mm measurement is 0.95mm longer.
20mm equals 2 centimeters.
20mm equals about 0.06562 feet.
25mm equals about 0.9843 inches, or 0.98 inches when rounded to two decimal places.
20mm is about 0.7874 inches. It falls between 3/4 inch and 13/16 inch.
20mm of rain equals about 0.7874 inches of rainfall.
20 inches equals 508 millimeters.
200mm equals about 7.874 inches.
Final Answer
20mm equals 0.7874 inches, or about 0.79 inches when rounded to two decimal places. Its closest common 1/32-inch fraction is 25/32 inch.
It also equals 2 centimeters and about 0.06562 feet. To convert any millimeter value into inches, divide it by 25.4.
Hi, I’m Marcus. I write conversion guides that turn confusing numbers into clear answers. Each article gives the exact value, a simple rounded version and real-life examples, so you can measure with confidence whether you’re shopping, building or just curious.