A4 paper
A4 paper is an ISO 216 paper format commonly used internationally for letters, forms and printed documents.
Also known as: paper
How big is it?
29.7 cm long
Also 11.69 in
Length · standard
A little perspective
A4 paper vs Smartphone: length comparison
A sheet of A4 paper is about 1.98 times as long as a smartphone.
A4 paper is an ISO 216 paper format commonly used internationally for letters, forms and printed documents.
A smartphone is a portable electronic device that combines mobile phone functions with internet access and apps.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. Horizontal rulers compare the selected spans; vertical brackets also identify height on the artwork.
Measurements, assumptions & sources +
A4 paper
Length: 29.7 cm; standard.
A4 is 210 × 297 mm. Its 0.06237 m² area is calculated from those nominal sides. The marked span uses the exact measurement; the generated paper texture and outline are illustrative.
University of Cambridge — ISO paper sizes
The marked length is calibrated. Unmeasured illustration details are representative.
Smartphone
Length: 15 cm; example.
A 150 × 72 mm, 200 g example phone.
Defined examples — our methodology
The marked length is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
Why this measurement?
Why we use 29.7 cm
We compare the length of a sheet of A4 paper. This value follows a stated standard.
A4 is 210 × 297 mm. Its 0.06237 m² area is calculated from those nominal sides. The marked span uses the exact measurement; the generated paper texture and outline are illustrative.
The marked vertical span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 29.7 cm | Not recorded | standard | |
| 623.7 cm² | Not recorded | standard | |
| 21 cm | Not recorded | standard | |
| 29.7 cm | Not recorded | standard |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valueEveryday objectsA5 paper21 cmLengthA5 paper is an ISO 216 paper format commonly used for notebooks, leaflets and small documents.
Around the same scaleEveryday objects30 cm floor tile30 cmLengthA floor tile is a flat, durable piece of material used to cover and finish floors in buildings.
Nearest higher valueEveryday objectsA3 paper42 cmLengthA3 paper is an ISO 216 paper format commonly used for drawings, diagrams and small posters.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- University of Cambridge — ISO paper sizesNominal trimmed A-series dimensions. Area computed from millimetre-rounded sides.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
Everyday thingsA3 paper42 cmA3 paper is an ISO 216 paper format commonly used for drawings, diagrams and small posters.Everyday thingsA5 paper21 cmA5 paper is an ISO 216 paper format commonly used for notebooks, leaflets and small documents.
Everyday thingsSmartphone15 cmA smartphone is a portable electronic device that combines mobile phone functions with internet access and apps.
Everyday thingsDesk1.2 mA desk is a table designed as a work surface for writing, reading or using equipment such as a computer.
Everyday thingsPineapple30 cmA pineapple is a tropical fruit with a tough, spiky rind and sweet, juicy flesh, produced by the plant Ananas comosus.
SportOrienteering control marker30 cmAn orienteering control marker is a fabric flag with orange and white panels used to mark checkpoints in orienteering events.
Living thingsDumbo octopus30 cmThe dumbo octopus is a deep-sea animal belonging to the genus Grimpoteuthis, recognised for its webbed arms and distinctive ear-like fins used for swimming.
PeopleHuman liver28 cmThe human liver is a vital organ in the abdomen that processes nutrients, detoxifies chemicals, and produces bile for digestion.