22mm equals 0.8661 inches, or about 0.87 inch. It is also very close to 7/8 inch, although the two measurements are not exactly the same.
If you want to picture 22mm, think of something slightly wider than a U.S. nickel and slightly smaller than a 20-cent euro coin.
How Many Inches Is 22mm?
The exact conversion is:
22mm = 0.8661417 inches
For everyday use, you can round this to:
22mm ≈ 0.87 inch
The conversion works because 1 inch equals exactly 25.4 millimeters.
So:
22 ÷ 25.4 = 0.8661417 inches
This means 22mm is less than one inch by about 0.134 inch.
Is 22mm the Same as 7/8 Inch?
No. 22mm is very close to 7/8 inch, but it is slightly smaller.
A measurement of 7/8 inch equals 22.225mm.
The difference is:
22.225mm − 22mm = 0.225mm
That is a very small difference, so 7/8 inch is a good visual comparison for 22mm.
However, they should not always be treated as the same size. A difference of 0.225mm can matter with sockets, bearings, fittings, bolts, and other parts that need a close fit.
22mm in Other Units
Here are a few useful conversions for 22mm.
| Unit | 22mm Equals |
|---|---|
| Inches | 0.8661417 in |
| Centimeters | 2.2 cm |
| Meters | 0.022 m |
| Feet | 0.07218 ft |
| Micrometers | 22,000 µm |
For most everyday situations, 2.2cm or 0.87 inch will be the easiest values to use.
10 Things Close to 22mm in Size
These examples can help you picture how big 22mm is. Some are exact nominal measurements, while others are slightly smaller or larger.
1. A 608 Ball Bearing
A standard 608 bearing has an outside diameter of 22mm.
Its common dimensions are 8mm for the inner opening, 22mm for the outer diameter, and 7mm for the width.
This makes the outside diameter of a 608 bearing an exact nominal 22mm comparison.
2. A 22mm Copper Tube
Some metric copper tubes have an outside diameter of 22mm.
That means measuring straight across the outside of the tube gives 22mm.
The inside opening is smaller because the tube walls take up some space. For this comparison, only the outside diameter is 22mm.
3. A 20-Cent Euro Coin
A €0.20 coin has a diameter of 22.25mm.
That makes it only 0.25mm wider than 22mm.
If you have one nearby, it gives a very close idea of what a 22mm-wide circle looks like.
4. A 7/8-Inch Width
A width of 7/8 inch equals 22.225mm.
That is only 0.225mm larger than 22mm.
For a simple visual estimate, 7/8 inch and 22mm look almost the same. They are still different measurements, especially where a precise fit matters.
5. A Bicycle Handlebar Control Area
Many bicycle brake levers and shifters are made to clamp around a 22.2mm diameter section of a handlebar.
That is just 0.2mm larger than 22mm.
Not every bicycle uses this size, so it should be treated as a common standard on certain handlebars rather than a size for all bikes.
6. A UK 20p Coin
A UK 20p coin has a diameter of 21.4mm.
That means 22mm is 0.6mm wider.
The difference is small, so a 20p coin gives a useful idea of the size, although it is not an exact match.
7. A U.S. Nickel
A U.S. nickel has a diameter of 21.21mm.
A 22mm measurement is therefore about 0.79mm wider than a nickel.
If you picture a nickel with just a small amount added to its width, you are close to 22mm.
8. A 5-Cent Euro Coin
A €0.05 coin measures 21.25mm across.
That makes it 0.75mm smaller than 22mm.
It is another useful coin comparison because the difference is less than one millimeter.
9. A CR2032 Coin Battery
A CR2032 coin battery is about 20mm in diameter.
That means 22mm is around 2mm wider.
These batteries are common in calculators, key fobs, small electronic devices, and some watches, so they can be an easy size reference.
10. A U.S. Quarter
A U.S. quarter has a diameter of 24.26mm.
That makes the quarter 2.26mm wider than 22mm.
A 22mm circle would therefore look noticeably smaller than a quarter, but the two are still close enough to make a useful visual comparison.
How to Convert 22mm to Inches
To convert millimeters to inches, divide the millimeter value by 25.4.
The formula is:
Millimeters ÷ 25.4 = inches
For 22mm:
22 ÷ 25.4 = 0.8661417 inches
Rounded to two decimal places:
22mm ≈ 0.87 inch
You can use the same formula for any other millimeter measurement.
For example:
20 ÷ 25.4 = 0.7874 inches
25 ÷ 25.4 = 0.9843 inches
18mm to 25.4mm Conversion Table
This table shows how 22mm compares with nearby measurements.
| Millimeters | Inches |
|---|---|
| 18mm | 0.7087 in |
| 19mm | 0.7480 in |
| 20mm | 0.7874 in |
| 21mm | 0.8268 in |
| 22mm | 0.8661 in |
| 23mm | 0.9055 in |
| 24mm | 0.9449 in |
| 25mm | 0.9843 in |
| 25.4mm | 1 in |
This also shows that 22mm is closer to 0.9 inch than to 0.8 inch.
It is also 3.4mm smaller than one full inch.
Final Thoughts
22mm equals 0.8661 inches, or about 0.87 inch. The closest common inch fraction is 7/8 inch, although 7/8 inch is slightly larger.
For an easy size reference, picture something slightly wider than a U.S. nickel or almost the same diameter as a 20-cent euro coin.
Common Questions
Is 22mm Almost 1 Inch?
Yes, 22mm is fairly close to one inch, but it is still smaller.
One inch is 25.4mm, so 22mm is 3.4mm less than one inch.
What Fraction of an Inch Is Closest to 22mm?
The closest common fraction is 7/8 inch.
Seven-eighths of an inch equals 22.225mm, which is only 0.225mm larger than 22mm.
Is 22mm Exactly 7/8 Inch?
No. 22mm and 7/8 inch are not exactly equal.
22mm equals about 0.8661 inch, while 7/8 inch equals 0.875 inch.
How Many Centimeters Is 22mm?
22mm equals exactly 2.2 centimeters.
There are 10 millimeters in one centimeter, so you simply divide 22 by 10.
Is 22mm Bigger Than a U.S. Nickel?
Yes. A U.S. nickel is 21.21mm in diameter, so 22mm is about 0.79mm wider.
They are close enough to be useful for a quick visual comparison.
Is 22mm Smaller Than a Quarter?
Yes. A U.S. quarter measures 24.26mm across.
That makes a quarter about 2.26mm wider than 22mm.
Can I Use a 7/8-Inch Socket Instead of a 22mm Socket?
They are very close in size, but they are not exactly the same.
A 22mm socket is made for a 22mm fastener, while 7/8 inch equals 22.225mm. A 7/8-inch socket may fit in some cases, but the small size difference can create extra movement or damage a fastener if the fit is poor.
For mechanical work, using the socket size made for the fastener is the safer choice.
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