How big is 4 inches?
You need to picture four inches and there is no ruler nearby. It is a middle size, a little longer than a bank card's longest edge and a little shorter than the long side of a dollar bill, so most people already own a dozen things that land close to it. Below are 23 things that are 4 inches long, each checked against a spec, a standard, or a careful measurement.
- 4 inches equals 10.16 cm, 101.6 mm, and one third of a foot.
- Closest common pair: two AA batteries end to end at 3.98 inches.
- A bank card corner to corner is 101.2 mm, which rounds to a clean four inches.
- Exactly 4 inches: four stacked hockey pucks, a 4 by 6 index card short side, or a maximum-length golf tee.
- A US quarter is 0.955 inches wide, so a little over four in a row is your pocket ruler for this length.
4 inches in every unit
| Unit | 4 inches equals |
|---|---|
| inches (this page) | 4 in |
| centimeters | 10.16 cm |
| millimeters | 101.6 mm |
| feet | 0.33 ft |
| meters | 0.1 m |
Where 4 inches sits
Each point links to that measurement. Use the neighbors to judge whether something is a little over or under 4 inches.
23 things that are 4 inches
Four inches is one of those sizes that is easy to picture once you have the right object in your hand. It is a little longer than a bank card's longest edge and a little shorter than the long side of a dollar bill, so most people already own a dozen things that land close to it.
The list runs from the objects that hit four inches almost exactly to the ones that sit a few millimeters under or over. Each entry gives the real measured or published figure, so you can see how honest the match is rather than trusting a round number.
Wherever a spec exists we used it: the US Mint for the quarter, ISO/IEC 7810 for bank cards, the NHL rule book for the puck, the Rules of Golf for the tee, and the battery standards for the cells. Items that vary from one maker to the next are marked as measured, with a sensible range instead of a false exact number.
1. Two AA batteries, end to end
3.98 in (101 mm)±0.2 mm per cellManufacturer specA single AA cell is 50.5 mm long, which is 1.99 inches. Line two up nose to tail and you get 101 mm, or 3.98 inches, sitting just a hair under a true four inches. Almost every remote, wireless mouse or game controller in the house has a pair, so it is the reference most people can reach for first.
The length is not a rough estimate. AA is a standardized size under IEC (LR6) and ANSI (15A), held to about 0.2 mm so any brand fits any device. To nudge the pair up to a dead four inches, slide a coin or a folded slip of paper between the two cells to make up the last 0.6 mm.
- Single AA cell: 50.5 mm (1.99 in) long
- Two end to end: 101 mm (3.98 in)
- Standards: IEC LR6, ANSI 15A
2. Bank card, corner to corner
3.98 in (101.2 mm)exact to ISO/IEC 7810Manufacturer specA bank card is not four inches on any single edge, but run the tape from one corner to the opposite corner and it measures 101.2 mm, or 3.98 inches. That diagonal is one of the most reliable four inch checks you can carry, because the card in your wallet is built to a fixed international size.
The card body is the ID-1 format in ISO/IEC 7810, 85.60 mm wide by 53.98 mm tall, and those two sides give a corner to corner diagonal of 101.2 mm by simple geometry. Every credit card, debit card, ID card and hotel key card in the ID-1 family shares that diagonal, so the trick works with whatever plastic you have.
- Card size: 85.60 x 53.98 mm (ISO/IEC 7810 ID-1)
- Corner to corner: 101.2 mm (3.98 in)
- Same size as most ID and key cards
3. Business card, corner to corner
4.03 in (102 mm)US 3.5 x 2 in cardIndustry standardA standard US business card is 3.5 by 2 inches. The long edge alone is only three and a half inches, but the diagonal across the card comes to about 102 mm, or 4.03 inches, landing a shade over four inches.
Because the printed size is a well established trade standard, a stack of business cards gives a repeatable four inch reference in a drawer or wallet. Cards printed to European sizes run a little smaller, so this check is most accurate with the North American 3.5 by 2 inch format.
- US card: 3.5 x 2 in (88.9 x 50.8 mm)
- Diagonal: about 102 mm (4.03 in)
- European cards run a little smaller
4. Four hockey pucks, stacked
4 in (101.6 mm)exact to NHL specIndustry standardA regulation ice hockey puck is exactly one inch thick, so a stack of four is four inches tall with nothing left over. It is the cleanest whole number match on this list and needs no arithmetic beyond counting to four.
The one inch thickness is set by the NHL rule book and matched by the IIHF, alongside a three inch diameter and a weight of 5.5 to 6 ounces. Practice and youth pucks keep the same one inch height even when the weight changes, so any solid black puck works.
- Puck thickness: 1 in (25.4 mm)
- Four stacked: 4 in (101.6 mm) exactly
- Set by NHL and IIHF rules
5. 4 by 6 index card, short side
4 in (101.6 mm)exact to card sizeIndustry standardThe 4 by 6 inch index card gives you four inches printed straight onto stationery. The short side is four inches and the long side is six, both held tightly by the paper trade, so a fresh card off the pad is a ready made ruler.
You can fold or mark the card and keep it as a reference without owning a real ruler. If your pack is the smaller 3 by 5 inch size instead, the short side is only three inches, so check the box before you rely on it.
- Card: 4 x 6 in
- Short side: 4 in (101.6 mm)
- Do not confuse with 3 x 5 in cards
6. Four-inch (20d) common nail
4 in (101.6 mm)20d penny sizeIndustry standardNail lengths in the United States follow the old penny system, and a 20d, or twenty penny, common nail is four inches long. The number does not equal the length directly, but the chart is fixed, and 20d has meant a clean four inches for generations of builders.
For reference, the 16d framing nail one size down is three and a half inches, and each penny step changes the length by about a quarter inch. If you keep a mixed box of nails, a 20d common nail is a surprisingly precise four inch gauge for the garage.
- 20d common nail: 4 in (101.6 mm)
- 16d nail: 3.5 in
- US penny (d) sizing system
7. Four-inch golf tee
4 in (101.6 mm)USGA/R&A maximumIndustry standardThe Rules of Golf cap a tee at four inches, so a maximum length tee is one of the few objects that is four inches by regulation. Under USGA and R&A Rule 6.2, a tee must not be longer than four inches, which is 101.6 millimeters, measured over the whole tee.
Most tees you buy are shorter, with 2.75 inches the most common and 3.25 inches popular for large drivers, so you need one of the long driver tees to reach the full four. If you have a four inch tee in your bag, it is one of the few everyday objects designed to sit right at this length.
- Maximum legal length: 4 in (101.6 mm)
- Rule: USGA and R&A Rule 6.2
- Common tees: 2.75 in and 3.25 in
8. 4-inch nursery pot, across the rim
~4 in (about 100 mm)nominal, often 3.75-4 inIndustry standardGarden centers sell seedlings in what they call a four inch pot, named for the width across the rim. Hold a ruler across the top of one and it reads close to four inches, which is why the size is a common unit for herbs and starter plants.
The four inch label is a nominal trade size rather than a laboratory measurement, so the real rim often falls between 3.75 and 4 inches depending on the maker. It is still a useful everyday match, especially if you already have a few empties stacked in the shed.
- Nominal rim width: about 4 in
- Actual often 3.75 to 4 in
- Common size for herbs and starters
9. iPhone SE or iPhone 5 screen (diagonal)
4 in (101.6 mm)Apple display specManufacturer specThe original iPhone SE and the iPhone 5 family share a screen that Apple measured at four inches corner to corner. If you still have one of these compact phones in a drawer, the glass is a genuine four inch diagonal reference.
The four inch figure is the diagonal of the display, not the height of the phone, which is taller. Later iPhones moved to larger screens, so this only works with the 5, 5s, 5c, and first generation SE from 2016.
- Screen diagonal: 4.0 in (101.6 mm)
- iPhone 5, 5s, 5c, SE (2016)
- Diagonal, not phone height
10. Audio cassette, long side
3.94 in (100 mm)varies slightly by makerManufacturer specA compact cassette tape is close to four inches along its longest side. The Philips shell that defined the format is about 100 millimeters wide, which puts the long edge right around 3.94 inches.
Sources vary by a millimeter or two because the outer shell was never machined to a single exact figure, and different makers rounded it differently. For a quick check it is a solid four inch stand in, and most people over a certain age can picture one instantly.
- Long side: about 100 mm (3.94 in)
- Format defined by Philips, 1963
- Shell size varies slightly by maker
11. Two C batteries, end to end
3.94 in (100 mm)±0.2 mm per cellManufacturer specA C size battery is 50 mm long, so two placed end to end come to 100 mm, or 3.94 inches, just under four. C cells are the fatter batteries used in flashlights and some toys, one step up from the AA.
Like the AA, the C size is standardized, listed as IEC R14 or LR14, with a 50 mm length and a 26.2 mm diameter. The pair falls about 1.6 mm short of a true four inches, which is close enough for rough estimating around the house.
- C cell: 50 mm long, 26.2 mm wide
- Two end to end: 100 mm (3.94 in)
- Standards: IEC R14 / LR14
12. Softball (diameter)
3.82 in (97 mm)12 in circumferenceManufacturer specA regulation twelve inch softball measures about 3.82 inches across, a little under four. The name is the confusing part: the twelve inches is the distance around the ball, while the diameter you would measure with a ruler is just under four.
The size is set by softball's governing bodies for adult and older youth play, with the ball weighing roughly six and a half ounces. Held against a four inch line, a softball stops a few millimeters short, which makes it a good honest reference rather than a perfect one.
- Diameter: 3.82 in (97 mm)
- Circumference: 12 in (the named size)
- Weight: about 6.5 oz
13. Four US quarters, in a row
3.82 in (97 mm)exact to US MintManufacturer specA US quarter is 0.955 inches wide, so four laid edge to edge stretch to 3.82 inches. That is just shy of four inches, which makes a quarter one of the best pocket rulers you can carry for this length.
The 0.955 inch, or 24.26 mm, diameter is fixed by the US Mint and holds across every modern design, which is why vending machines sort them so reliably. To reach a full four inches you need a little over four quarters, so think of four coins as your lower bound and a fifth as the top up.
- Quarter diameter: 0.955 in (24.26 mm)
- Four in a row: 3.82 in
- Just over four quarters = 4 in
14. Standard playing card (height)
3.5 in (88.9 mm)poker/bridge sizeManufacturer specA standard playing card is three and a half inches tall, which sits just under four inches. Poker and bridge cards share this height, so a card held upright is a familiar object that lands close to the mark without quite reaching it.
The half inch gap matters if you need a true four inches, so treat a playing card as a floor rather than an exact match. It is still one of the most recognizable references here, since almost everyone can picture a card without looking for one.
- Card height: 3.5 in (88.9 mm)
- Width: 2.5 in
- Just under 4 in by half an inch
15. No. 10 business envelope, short side
4.13 in (104.8 mm)#10 standardIndustry standardThe number ten business envelope, the standard size for letters and bills, is 4.125 inches on its short side. That puts the height of a normal mailing envelope just over four inches, close enough to picture the length at a glance.
The long side runs to nine and a half inches, which is why a folded sheet of letter paper slides in neatly. If you are estimating four inches with a stack of mail nearby, the short edge of a standard envelope is a dependable guide that sits one eighth of an inch above the mark.
- #10 envelope: 4.125 x 9.5 in
- Short side: 4.125 in (104.8 mm)
- A touch over 4 in
16. Kitchen sponge (long side)
~4-4.5 in (100-115 mm)varies by brandMeasured in houseA standard rectangular kitchen sponge is close to four inches on its long side. Most cleaning sponges sold in packs measure about four to four and a half inches, sized to sit comfortably in an adult hand.
Because sponges are soft and cut to slightly different sizes by each brand, treat this as a close range rather than an exact figure. A fresh, dry sponge is a little larger than one that has been used and squeezed, so measure a new one if you want the truer number.
- Long side: about 4 to 4.5 in
- Sized to fit an adult hand
- Varies by brand
17. Adult palm (length)
~4 in (100 mm)3.9-4.1 in, variesMeasured in houseThe palm of an adult hand, measured from the wrist crease to where the fingers begin, is often about four inches. It varies from person to person, but for many adults the palm lands within a few millimeters of the mark.
This is worth measuring once on your own hand, because then you always carry a personal four inch gauge. Note that palm length is not the same as hand length, which includes the fingers and runs closer to seven or eight inches.
- Typical adult palm: about 3.9 to 4.1 in
- Measured wrist crease to base of fingers
- Varies by person, so measure your own
18. Toilet paper roll (diameter)
~4-4.5 in (100-115 mm)varies by brandMeasured in houseA fresh toilet paper roll is about four inches across, measuring the diameter of the full roll straight out of the pack. It is a familiar object in every home, which makes it an easy mental picture for the size.
Rolls have shrunk slightly over the years and vary by brand, so treat this as a close estimate between four and four and a half inches. Note that the diameter across the circle is a different measurement from the width of the tube along its length.
- Roll diameter: about 4 to 4.5 in
- Measured across the full roll
- Diameter, not tube width
19. Folding pocket knife, closed
~4 in (100 mm)3.75-4.1 in, variesMeasured in houseMany everyday folding pocket knives are close to four inches long when closed. The four inch closed length is a popular size for pocket carry, balancing a usable blade against something that still fits in a jeans pocket.
Because models differ, treat this as a measured range of roughly 3.75 to 4.1 inches rather than an exact number. If you own one, checking its closed length once turns it into a reliable four inch reference for the toolbox.
- Closed length: about 3.75 to 4.1 in
- Common everyday-carry size
- Varies by model
20. Pocket comb
~4 in (102 mm)varies by makerMeasured in houseA folding or pocket comb is often about four inches long, sized to slip into a pocket or bag. The compact combs sold for travel and everyday carry cluster around this length, which makes one a handy straight edge reference.
Full size combs run longer, closer to seven or eight inches, so this only holds for the small pocket style. Lengths vary by maker, so check yours once and it becomes a reliable four inch guide.
- Pocket comb: about 4 in
- Full-size combs: 7 to 8 in
- Varies by maker
21. Drink coaster (diameter)
~3.5-4 in (90-102 mm)varies by styleMeasured in houseA round drink coaster is often around four inches across. The classic bar and cafe coaster sits between three and a half and four inches in diameter, so a typical one is a fair stand in for the length.
Square coasters and novelty shapes vary more, so a plain round cardboard or cork coaster gives the most consistent match. It is a handy reference at a table where you might not have anything more precise to hand.
- Diameter: about 3.5 to 4 in
- Round coasters most consistent
- Varies by style
22. Four paper clips, end to end
~4 in (100 mm)small No.1 clipsMeasured in houseFour paper clips laid end to end come to about four inches, but only if you use the small size. A small number one paper clip is close to one inch long, so four line up near four inches, which is why offices reach for them as a quick gauge.
Watch the clip size before you trust this one. Standard clips are actually about 1.4 inches each, so four of those stretch closer to five and a half inches, well past four. Count small one inch clips for four inches, or three larger clips for roughly the same length.
- Four small (No.1) clips: about 4 in
- Small clip: about 1 in each
- Standard clip: about 1.4 in
23. Full-size Snickers bar
~4 in (100 mm)standard single barMeasured in houseA full size Snickers bar is close to four inches long. It is a light hearted reference, but a familiar one, and the standard single bar lands right around the four inch mark.
Fun size and share pack bars are shorter, so the comparison only holds for the standard single. Chocolate bars are not made to engineering tolerances, so treat this as a rough, everyday estimate rather than a precise gauge.
- Full-size bar: about 4 in long
- Fun-size: about 2 in
- A rough, everyday reference
How these sizes compare
Every object sits close to 4 inches. Here they are as one visual, with the 4 in line marked so you can see what is just under and just over.
How to estimate 4 inches without a ruler
You do not need a tape measure to judge four inches. The trick is to memorize one or two objects you always have on you and use them as a personal ruler whenever the question comes up. Once you have checked them against a real ruler a few times, four inches becomes a size you can see rather than one you have to measure.
The most portable references are the ones in your pocket. A bank card's diagonal is 3.98 inches, and a US quarter is 0.955 inches wide, so both give a fast way to check the length against something you already carry.
For a little more precision, combine two references. Line up a card diagonal and add the width of a quarter, or count four quarters and add one more, and you will bracket four inches from just below to just above. The table below ranks the quickest methods by how exact each one is.
- Fast and close: a bank card corner to corner is 3.98 inches, essentially four.
- Most exact: four hockey pucks stacked give a true four inches to the millimeter.
- Always to hand: four US quarters make 3.82 inches, so add a fifth to pass four.
| Method | How | How exact |
|---|---|---|
| Bank card, corner to corner | A bank card diagonal is 3.98 in, essentially four inches. | Close |
| Four hockey pucks stacked | Each puck is 1 in thick, so four give an exact four inches. | Exact |
| Two AA batteries end to end | Two AA cells in a line measure 3.98 in. | Close |
| Four quarters plus one | Four quarters reach 3.82 in; a fifth pushes just past four. | Close |
Where 4 inches actually shows up
Four inches shows up more often than you might expect. It is a common size for phone screens, plant pots, picture borders, and the spacing called for in all sorts of home and craft projects, so a quick sense of it saves time whenever a ruler is missing.
Building codes and safety guidance use it too. The well known four inch rule for railing and baluster gaps exists so a small child's head cannot pass through, which is why getting the estimate right can matter beyond convenience.
Knowing what four inches looks like also speeds up online shopping. When a listing gives a length in inches with no photo for scale, a quick mental check against a card or a coin tells you whether the item will actually fit. The table below shows where four inches earns its keep day to day.
- Online shopping: judge a product size from a listing with no scale photo.
- Home safety: railing and baluster gaps are commonly held under four inches.
- Crafts and framing: patterns and borders frequently call for four inch pieces.
| Situation | Why it helps |
|---|---|
| Online shopping | Phone parts, grips and small products are often quoted near four inches. |
| Home safety | Railing and baluster gaps are held under four inches so a child's head cannot pass. |
| Crafts and framing | Four inch borders, pieces and seam runs come up often. |
| Gardening | Plant pots and seed trays use four inches as a nominal size. |
Common mistakes
The biggest mistake is trusting a name instead of a measurement. A twelve inch softball is not twelve inches across, and a four inch pot is a nominal label, so the printed name and the ruler figure are not always the same thing.
Confusing diameter, circumference and width causes a lot of errors. A softball's twelve inches is the distance around it, while its diameter is under four, and a toilet roll's diameter and the width of its tube are two different numbers.
Rounding hides the small gaps that sometimes matter. Two AA batteries are 3.98 inches, not four, and four quarters are 3.82 inches, so if a project needs a true four inches, know which references sit under the mark and which sit over it. The table below lists the usual slips and the quick fix for each.
- A twelve inch softball is 12 in around, but only 3.82 in across.
- A four inch plant pot is a nominal label, often 3.75 to 4 in at the rim.
- Two AA batteries are 3.98 in and four quarters 3.82 in, not a flat four.
| Mistake | The fix |
|---|---|
| Reading a nominal size, like a 4-inch pot, as an exact measurement | The rim is often 3.75 to 4 in. Measure it rather than trusting the label. |
| Mixing up a softball's circumference and diameter | The 12 in is around the ball; across it is 3.82 in. |
| Rounding 3.82 or 3.98 in up to a flat four | Know which references sit under the mark and which sit over it. |
Summary: every object at a glance
| Object | Figure | Tolerance | Source |
|---|---|---|---|
| Two AA batteries, end to end | 3.98 in (101 mm) | ±0.2 mm per cell | Manufacturer spec |
| Bank card, corner to corner | 3.98 in (101.2 mm) | exact to ISO/IEC 7810 | Manufacturer spec |
| Business card, corner to corner | 4.03 in (102 mm) | US 3.5 x 2 in card | Industry standard |
| Four hockey pucks, stacked | 4 in (101.6 mm) | exact to NHL spec | Industry standard |
| 4 by 6 index card, short side | 4 in (101.6 mm) | exact to card size | Industry standard |
| Four-inch (20d) common nail | 4 in (101.6 mm) | 20d penny size | Industry standard |
| Four-inch golf tee | 4 in (101.6 mm) | USGA/R&A maximum | Industry standard |
| 4-inch nursery pot, across the rim | ~4 in (about 100 mm) | nominal, often 3.75-4 in | Industry standard |
| iPhone SE or iPhone 5 screen (diagonal) | 4 in (101.6 mm) | Apple display spec | Manufacturer spec |
| Audio cassette, long side | 3.94 in (100 mm) | varies slightly by maker | Manufacturer spec |
| Two C batteries, end to end | 3.94 in (100 mm) | ±0.2 mm per cell | Manufacturer spec |
| Softball (diameter) | 3.82 in (97 mm) | 12 in circumference | Manufacturer spec |
| Four US quarters, in a row | 3.82 in (97 mm) | exact to US Mint | Manufacturer spec |
| Standard playing card (height) | 3.5 in (88.9 mm) | poker/bridge size | Manufacturer spec |
| No. 10 business envelope, short side | 4.13 in (104.8 mm) | #10 standard | Industry standard |
| Kitchen sponge (long side) | ~4-4.5 in (100-115 mm) | varies by brand | Measured in house |
| Adult palm (length) | ~4 in (100 mm) | 3.9-4.1 in, varies | Measured in house |
| Toilet paper roll (diameter) | ~4-4.5 in (100-115 mm) | varies by brand | Measured in house |
| Folding pocket knife, closed | ~4 in (100 mm) | 3.75-4.1 in, varies | Measured in house |
| Pocket comb | ~4 in (102 mm) | varies by maker | Measured in house |
| Drink coaster (diameter) | ~3.5-4 in (90-102 mm) | varies by style | Measured in house |
| Four paper clips, end to end | ~4 in (100 mm) | small No.1 clips | Measured in house |
| Full-size Snickers bar | ~4 in (100 mm) | standard single bar | Measured in house |
Frequently asked questions
How long is 4 inches?
Four inches is 10.16 centimeters, 101.6 millimeters, and one third of a foot. A quick way to picture it is a bank card measured corner to corner, which comes to 3.98 inches.
What household items are 4 inches long?
Common four inch items include a 4 by 6 index card short side, four stacked hockey pucks, a 20d nail, a maximum length golf tee, two AA batteries end to end, and a bank card's diagonal. Most homes have several of these.
How many cm is 4 inches?
Four inches equals 10.16 centimeters, since one inch is 2.54 centimeters. In millimeters that is 101.6 mm.
What does 4 inches look like?
It looks a little longer than a bank card's long edge and about the length of an adult palm. Picture two AA batteries in a line or the short side of a 4 by 6 index card.
Is a credit card 4 inches?
Not along any edge. A credit card is 3.37 inches long and 2.13 inches tall, but the diagonal from corner to corner is 3.98 inches, which rounds to four.
How many quarters make 4 inches?
A US quarter is 0.955 inches wide, so four in a row reach 3.82 inches. You need a little over four, closer to four and a quarter coins, to make a full four inches.
How can I measure 4 inches without a ruler?
Use a bank card diagonal, which is 3.98 inches, or line up four quarters and add a fifth. Two AA batteries end to end also give 3.98 inches.
How big is a 4 inch phone screen?
A four inch screen is measured on the diagonal, corner to corner. The iPhone 5 and first generation iPhone SE used exactly this size, and the phone body itself is taller than four inches.
Is 4 inches the same as 10 cm?
They are close but not equal. Four inches is 10.16 cm, so it is about 1.6 mm longer than a round 10 centimeters.
How many inches is a hockey puck?
A regulation hockey puck is one inch thick and three inches in diameter. Stacking four pucks gives you exactly four inches in height.
What is 4 inches in feet?
Four inches is one third of a foot, or about 0.33 feet, since a foot is twelve inches.
Why does the 4 inch rule matter for railings?
Many safety guidelines keep gaps in railings and balusters under four inches so a small child cannot fit their head through. It is a common reason people need to picture the size accurately.
How we measured this
Exact figures come from published specifications and standards where a size is fixed: coins from the US Mint, cards from ISO/IEC 7810, regulation equipment from its governing body. Items marked measured in house were checked by hand against a dual-scale steel ruler and rounded to a sensible everyday value. Where an object varies by brand, we give the most common size and flag the variation in the text.
Sources: ISO/IEC 7810 - identification cards · US Mint - circulating coin specifications (quarter 24.26 mm) · IEC 60086 and ANSI C18 - primary battery dimensions (AA · NHL - official rules · USGA and R&A - Rules of Golf · USA Softball - official playing rules (12 in softball) · ASTM F1667 - specification for driven fasteners (nail penny sizes) · Apple - iPhone 5 and iPhone SE technical specifications (4 in display) · Reviewed by Priya Nandakumar · Last edited 11 Sep 2026.
Sources
- ISO/IEC 7810 - identification cards, physical characteristics (ID-1)
- US Mint - circulating coin specifications (quarter 24.26 mm)
- IEC 60086 and ANSI C18 - primary battery dimensions (AA, C)
- NHL - official rules, puck specification
- USGA and R&A - Rules of Golf, Rule 6.2 (tee maximum 4 in)
- USA Softball - official playing rules (12 in softball)
- ASTM F1667 - specification for driven fasteners (nail penny sizes)
- Apple - iPhone 5 and iPhone SE technical specifications (4 in display)
Cite this page
RulerCue. "Things That Are 4 Inches Long: 23 Everyday Examples." RulerCue, updated 11 Sep 2026. https://rulercue.com/inches/4-inches/
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