45 cm is equal to 17.72 inches when rounded to two decimal places. More exactly, 45 cm equals 17.716535 inches.
That means 45 cm is just a little shorter than 18 inches. It is also 450 millimeters, 0.45 meter, or about 1 foot 5.72 inches.
This guide shows the conversion, other useful units, and everyday objects that can help you picture 45 cm.
How Many Inches Is 45 cm?
45 cm = 17.716535 inches, or 17.72 inches for everyday use.
The conversion is based on the exact relationship:
1 inch = 2.54 cm
So:
45 ÷ 2.54 = 17.716535 inches
Rounding to two decimal places gives 17.72 inches.
It is also useful to compare 45 cm with 18 inches:
18 inches = 45.72 cm
So 45 cm is 0.72 cm, or about 0.28 inch, shorter than 18 inches.
How Big Is 45 cm?
A length of 45 cm is a little less than a foot and a half.
In feet and inches, it is about 1 foot 5.72 inches.
Another easy way to picture it is to imagine an 18-inch length and remove a little more than a quarter of an inch.
You may see measurements close to 45 cm in kitchen appliances, cushions, shelves, chopping boards, lampshades, and other household items. The exact size depends on the product.
10 Everyday Things Close to 45 cm
1. Adult Clothes Hanger
A typical adult clothes hanger is around 17 to 18 inches wide, or roughly 43 to 46 cm.
This makes an adult hanger a good visual comparison for 45 cm.
Hanger sizes vary, so it should be treated as an approximate comparison rather than an exact one.
2. Slimline Dishwasher
Some slimline dishwashers are made to be about 45 cm wide.
Bosch, for example, has a range of freestanding dishwashers listed with a 45 cm width.
If you have seen a narrow dishwasher designed for a smaller kitchen, its width can give you a good idea of what 45 cm looks like.
3. A3 Sheet of Paper
An A3 sheet measures 29.7 × 42 cm.
Its long edge is therefore 42 cm, which is 3 cm shorter than 45 cm.
Imagine the long side of an A3 sheet with another 3 cm added. That gives a length of 45 cm.
4. An 18-Inch Ruler or Measuring Length
An 18-inch measuring length equals 45.72 cm.
That makes it only 0.72 cm longer than 45 cm.
If you have an 18-inch ruler, 45 cm would stop just short of its end.
5. Three 15 cm Rulers
Three exact 15 cm measuring lengths placed end to end equal 45 cm exactly.
The calculation is simple:
15 cm + 15 cm + 15 cm = 45 cm
This is one of the easiest ways to create a true 45 cm length using smaller metric rulers or marked sections.
6. One and a Half 30 cm Rulers
A 30 cm ruler plus another 15 cm equals exactly 45 cm.
30 cm + 15 cm = 45 cm
So 45 cm is exactly one and a half times the measuring length of a 30 cm ruler.
7. A 45 × 45 cm Sofa Cushion
Square cushion covers are commonly sold in a 45 × 45 cm size.
One UK size guide describes 45 × 45 cm as a common standard square cushion size for sofas.
The width of one of these cushion covers is exactly 45 cm according to its listed size. The finished cushion can look slightly different depending on how full the insert is.
8. A Large Chopping Board
Some large kitchen chopping boards are exactly 45 cm long.
For example, IKEA lists its SNEDNÄBB bamboo chopping board at 45 cm long and 28 cm wide.
This makes a large chopping board a very practical way to picture a 45 cm length. Chopping boards come in many other sizes, so this applies only to products with similar dimensions.
9. A Large Lampshade
Some large lampshades have a diameter of exactly 45 cm.
IKEA lists one pendant lampshade with a 45 cm diameter, while other manufacturers also sell shades in this size.
Picture the distance straight across the widest part of a large round lampshade. On a 45 cm model, that distance matches the measurement exactly.
10. A 450 mm Shelf or Kitchen Unit
You may also see 45 cm written as 450 mm on furniture and kitchen fittings.
For example, some storage shelves are listed as 450 mm wide, and some kitchen storage systems are designed for 450 mm-wide units.
Since 450 mm equals exactly 45 cm, this is the same measurement written in millimeters.
45 cm in Other Units
Here are the main conversions for 45 cm:
| Unit | 45 cm equals |
|---|---|
| Inches | 17.7165 in |
| Inches rounded | 17.72 in |
| Millimeters | 450 mm |
| Meters | 0.45 m |
| Feet | 1.47638 ft |
| Feet and inches | About 1 ft 5.72 in |
The inch conversion uses 1 inch = 2.54 cm.
The metric conversions are exact because 100 centimeters make 1 meter and 10 millimeters make 1 centimeter.
How to Convert 45 cm to Inches
To convert centimeters to inches, divide the centimeter value by 2.54.
For 45 cm:
45 ÷ 2.54 = 17.716535 inches
For most everyday uses, you can round this to:
45 cm ≈ 17.72 inches
If you only need a rough size, saying about 17.7 inches is also fine.
40–50 cm to Inches Conversion Table
The table below shows nearby measurements so you can see how 45 cm compares with slightly smaller and larger sizes.
| Centimeters | Inches |
|---|---|
| 40 cm | 15.75 in |
| 41 cm | 16.14 in |
| 42 cm | 16.54 in |
| 43 cm | 16.93 in |
| 44 cm | 17.32 in |
| 45 cm | 17.72 in |
| 46 cm | 18.11 in |
| 47 cm | 18.50 in |
| 48 cm | 18.90 in |
| 49 cm | 19.29 in |
| 50 cm | 19.69 in |
Each value is calculated using the exact relationship of 2.54 cm per inch.
Final Thoughts
45 cm equals 17.72 inches, or just under 18 inches.
A simple way to picture the size is the width of a typical adult clothes hanger or the length of a large 45 cm chopping board. A 45 × 45 cm sofa cushion is another easy reference.
Common Questions
Is 45 cm the Same as 18 Inches?
No. 45 cm equals about 17.72 inches.
Eighteen inches equals 45.72 cm, so 45 cm is about 0.72 cm shorter.
How Many Feet Is 45 cm?
45 cm equals about 1.476 feet.
That is approximately 1 foot 5.72 inches.
How Many Millimeters Is 45 cm?
45 cm equals exactly 450 millimeters.
There are 10 millimeters in each centimeter, so:
45 × 10 = 450 mm
Is 45 cm Longer Than an A3 Sheet of Paper?
Yes. The long side of standard A3 paper is 42 cm, so 45 cm is 3 cm longer.
The difference is about 1.18 inches.
What Everyday Object Is About 45 cm Long?
A typical adult clothes hanger is a good approximate example because many are around 43 to 46 cm wide.
Some chopping boards, lampshades, cushions, dishwashers, shelves, and kitchen units also have a listed dimension of 45 cm.
How Do You Measure 45 cm Without a 45 cm Ruler?
You can use a 30 cm ruler and measure another 15 cm after it.
You could also place three exact 15 cm measuring lengths end to end. Together they make exactly 45 cm.
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