Twenty inches is a useful measurement to understand because it is large enough to describe many everyday objects, but small enough to compare with things you can easily find around your home.
20 inches equals 1 foot 8 inches, or about 50.8 centimeters. If you do not have a ruler or measuring tape nearby, comparing 20 inches with familiar objects can give you a good visual idea of the length.
In this guide, we will look at 12 common things that are around 20 inches long. Some objects may be designed close to 20 inches, while others can vary slightly depending on the model or manufacturer.
How Long Is 20 Inches?
Before looking at examples, it helps to understand the actual measurement.
- 20 inches = 1 foot 8 inches
- 20 inches = 50.8 centimeters
- 20 inches = 508 millimeters
- 20 inches = 1.67 feet
A standard measuring tape makes it easy to check exactly 20 inches. But if you are trying to picture the measurement without a ruler, everyday objects can provide a helpful reference.
12 Common Things That Are Exactly 20 Inches Long
1. A Medium Laptop or Computer Monitor
Some medium-sized computer displays have a physical width close to 20 inches.
However, it is important to distinguish between screen size and physical width. Monitor and laptop sizes are usually measured diagonally, not from left to right.
A monitor with a diagonal measurement around 20 inches may therefore have a width smaller than 20 inches.
If you need an object that is actually 20 inches long, measure its physical dimensions rather than relying on the advertised screen size.
Still, a medium computer display can help you visualize how substantial 20 inches is.
2. A Large Cutting Board
Some large kitchen cutting boards are designed with a length close to 20 inches.
A rectangular cutting board might measure approximately 20 inches from one end to the other while being around 12 to 15 inches wide.
This makes a large cutting board one of the easiest household objects to imagine when thinking about 20 inches.
If you place a measuring tape along the longest side, you can see exactly how far 20 inches extends.
3. A Large Serving Tray
Large serving trays can also have a length of about 20 inches.
A rectangular serving tray measuring roughly 20 inches long provides plenty of room for plates, glasses, snacks, or other items.
The exact dimensions vary considerably. Some trays may be shorter, while larger models can exceed 20 inches.
For a quick visual comparison, imagine a tray extending about 1 foot 8 inches from end to end.
4. A Small Throw Pillow
Some decorative throw pillows are approximately 20 inches wide.
A common square pillow size is 20 × 20 inches. This means the pillow measures 20 inches across one side and 20 inches across the other.
That makes a 20-inch square pillow an especially useful reference.
If you have a standard decorative pillow at home, check its tag or measure it from edge to edge. You may find that it is very close to 20 inches.
How Big Is a 20-Inch Pillow?
A 20-inch pillow is fairly large for a decorative cushion.
It can be used on:
- Sofas
- Beds
- Armchairs
- Benches
- Window seats
Because it is approximately 20 inches across, it provides a convenient visual example of this measurement.
5. A Small Pet Bed
Some small and medium pet beds measure approximately 20 inches across their longest dimension.
For example, a compact rectangular or oval dog bed may be around 20 inches long.
The actual dimensions depend on the design and the manufacturer. Some beds are significantly larger or smaller.
If you are trying to visualize 20 inches, imagine a small pet bed extending from one end to the other by about 1 foot and 8 inches.
6. A Large Kitchen Pan
Certain roasting pans, baking pans, and other kitchen cookware can approach 20 inches in length.
Large roasting pans are often longer than standard baking dishes because they are designed to hold larger meals.
When measuring one, remember to measure the outside or inside dimension consistently, depending on what you want to compare.
A pan measuring exactly 20 inches long would give you a good example of the measurement.
7. A Small Wall Shelf
A compact wall shelf can easily be around 20 inches wide.
For example, a floating shelf may be designed at 18, 20, or 24 inches wide.
A 20-inch shelf is long enough to display books, photographs, small plants, or decorations without taking up too much wall space.
Because shelves have straight edges, they are also easy to compare against a measuring tape.
8. A Large Book or Coffee Table Book
Some large-format books can measure close to 20 inches when opened or displayed in certain orientations.
However, most ordinary books are much smaller than 20 inches on their longest side.
Large photography books, art books, display books, and oversized reference books can have considerably larger dimensions.
If you find a large book measuring around 20 inches from top to bottom or across its width, it can provide a useful physical comparison.
9. A Small Storage Container
Large storage boxes and containers can come in dimensions close to 20 inches.
For example, a rectangular storage container might measure about 20 inches long while being narrower in width and height.
Storage containers are common household objects, making them practical references for understanding measurements.
If you have several containers, check their labels or measure them with a tape measure. You may find one that is close to 20 inches long.
10. A Large Keyboard Tray or Desk Accessory
Some keyboard trays and desk organizers can be around 20 inches wide.
A typical computer keyboard is considerably shorter than 20 inches, but a complete keyboard tray or wider desk accessory can reach this measurement.
Imagine placing a measuring tape horizontally across a desk accessory. The distance from the first end to the other may be close to 20 inches.
This is another useful way to understand the size because most people are familiar with the dimensions of a computer desk.
11. A Small Suitcase or Travel Bag
Some compact travel bags and small suitcases can have a longest dimension close to 20 inches.
Carry-on luggage often falls within a range that can make 20 inches a useful reference point, although exact dimensions differ between brands and models.
A suitcase measuring approximately 20 inches tall can look noticeably larger than a typical backpack while still being compact enough for short trips.
If you are comparing luggage, always check the manufacturer’s listed dimensions because wheels, handles, and exterior pockets can affect the total size.
12. A Large Picture Frame
A large rectangular picture frame can have one side measuring exactly 20 inches.
For example, you might find frames that measure:
- 20 × 16 inches
- 20 × 18 inches
- 20 × 20 inches
- 20 × 24 inches
A 20-inch side gives you a very straightforward way to visualize the measurement.
If you already have a large picture frame at home, measure its outside edge. You may discover that one dimension is close to 20 inches.
What Does 20 Inches Look Like?
Twenty inches is 50.8 centimeters long.
One of the simplest ways to picture it is to imagine a straight line extending from one end to another for 1 foot and 8 inches.
Another useful comparison is to use a standard 12-inch ruler.
A 12-inch ruler covers one foot. After placing another 8 inches beside it, the combined distance is exactly 20 inches.
So:
12 inches + 8 inches = 20 inches
This is often easier to visualize than thinking about centimeters.
How Long Is 20 Inches Compared With a Foot?
A foot contains 12 inches.
Therefore:
20 inches = 1 foot 8 inches
Twenty inches is 8 inches longer than one foot.
You can also express it as approximately 1.67 feet.
This makes 20 inches noticeably longer than a standard ruler but considerably shorter than 2 feet.
For a simple visual:
1 foot = 12 inches
20 inches = 1 foot + 8 inches
2 feet = 24 inches
So 20 inches sits between one foot and two feet.
How Long Is 20 Inches in Centimeters?
One inch equals 2.54 centimeters.
Therefore:
20 × 2.54 = 50.8 centimeters
So, 20 inches is exactly 50.8 cm.
This is useful when comparing measurements from products that use the metric system.
For example, if a product description says that something is approximately 51 cm long, it is almost the same length as 20 inches.
How Long Is 20 Inches in Millimeters?
There are 10 millimeters in one centimeter.
Since 20 inches equals 50.8 centimeters:
50.8 × 10 = 508 millimeters
Therefore:
20 inches = 508 mm
This conversion can be useful when working with technical measurements, furniture dimensions, crafts, or DIY projects.
Is 20 Inches a Long Measurement?
It depends on what you are measuring.
For a small household object, 20 inches can be relatively long. For furniture or large equipment, it may be considered fairly short.
For example:
- A 20-inch pillow is relatively large.
- A 20-inch cutting board is large.
- A 20-inch shelf is compact.
- A 20-inch suitcase is relatively small.
- A 20-inch piece of furniture may be quite narrow.
The meaning of 20 inches depends on the object being measured.
How to Measure Exactly 20 Inches
The easiest way to measure 20 inches is with a tape measure.
Start at the 0-inch mark and extend the tape until you reach the 20-inch mark.
Make sure the tape is straight and does not bend or curve.
For objects with rounded edges, measure along the longest straight dimension if you are trying to determine the object’s overall length.
For an exact measurement, avoid estimating based only on appearance.
Can You Measure 20 Inches Without a Tape Measure?
Yes, although the result may only be an estimate.
A standard ruler is usually 12 inches long. You can use it to measure 12 inches and then measure another 8 inches.
Another option is to use a known object with a verified length.
For example, if you have a ruler that is exactly 12 inches long:
12 inches + 8 inches = 20 inches
This can help you estimate 20 inches when a measuring tape is unavailable.
20 Inches Compared With Common Measurements
| Measurement | Equivalent |
|---|---|
| 20 inches | 1 foot 8 inches |
| 20 inches | 1.67 feet |
| 20 inches | 50.8 cm |
| 20 inches | 508 mm |
| 20 inches | 0.508 meters |
| 20 inches | 1/12 of 20 feet |
This table makes it easier to understand 20 inches in different measurement systems.
Things That Are Around 20 Inches Long
Not every object listed above will measure exactly 20 inches. Product dimensions can vary by brand, model, and design.
Some useful examples to check include:
- Large cutting boards
- Serving trays
- 20-inch square pillows
- Small pet beds
- Large kitchen pans
- Small wall shelves
- Oversized books
- Storage containers
- Wide desk accessories
- Compact suitcases
- Large picture frames
- Certain household organizers
The exact dimensions should always be checked before using an object as a precise measurement reference.
Why Knowing What 20 Inches Looks Like Is Useful
Understanding common measurements can be helpful in many situations.
You might need to estimate the size of an object before buying it online. You may also want to know whether something will fit inside a cabinet, on a shelf, in a suitcase, or on a desk.
Knowing that 20 inches equals 50.8 cm gives you a useful mental reference.
Instead of simply reading “20 inches” in a product description, you can picture a distance of about half a meter.
Frequently Asked Questions
How long is 20 inches?
20 inches is exactly 1 foot 8 inches, or 50.8 centimeters.
What is 20 inches in feet?
Twenty inches equals approximately 1.67 feet.
What is 20 inches in centimeters?
20 inches equals 50.8 centimeters.
What is 20 inches in millimeters?
20 inches equals 508 millimeters.
Is 20 inches the same as 2 feet?
No. Two feet equals 24 inches. Therefore, 20 inches is 4 inches shorter than 2 feet.
Is 20 inches a big size?
It depends on the object. A 20-inch pillow or cutting board is relatively large, while a 20-inch shelf or suitcase may be considered compact.
What household item is exactly 20 inches long?
A product specifically manufactured with a 20-inch dimension can be exactly 20 inches long. Examples can include some shelves, trays, cutting boards, frames, and pillows. However, dimensions vary, so check the product specifications before assuming an object is exactly 20 inches.
How can I visualize 20 inches?
Think of 1 foot plus another 8 inches. You can also visualize it as 50.8 centimeters, which is just over half a meter.
Is 20 inches longer than a standard ruler?
Yes. A standard ruler is usually 12 inches long, so 20 inches is 8 inches longer than a standard 12-inch ruler.
Final Thoughts
Twenty inches is a useful length to understand because it appears in many everyday products and household measurements.
It equals 1 foot 8 inches, 50.8 centimeters, or 508 millimeters. You can visualize it using objects such as large cutting boards, serving trays, square pillows, shelves, storage containers, picture frames, and compact travel bags.
Keep in mind that the dimensions of everyday products are not always exact. An object described as being around 20 inches may actually measure 19, 20, or 21 inches depending on its design.
For an exact measurement, always use a ruler or measuring tape.
Once you become familiar with the length of 20 inches, it becomes much easier to estimate the size of objects without needing to measure every item.
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