Paper Size Converter
Look up A4, Letter, Legal, and nearby paper sizes in millimetres and inches in your browser.
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Tool workspace
Select a standard paper size to see portrait width × height in millimetres and inches. Lookup runs in your browser — values are not sent to our servers.
Size comparison
| Size | mm (W × H) | in (W × H) |
|---|---|---|
How it works
ISO 216 A-series sizes use exact millimetre dimensions. US Letter, Legal, and Tabloid use exact inch dimensions; millimetres are derived with 1 in = 25.4 mm (exact).
Results update as soon as you change the size. Empty selection clears the detail outputs—no error. Unknown size keys show a validation message.
Use Sample for A4 (210 × 297 mm).
Examples
- A4 → 210 × 297 mm (≈ 8.27 × 11.69 in)
- Letter → 8.5 × 11 in (215.9 × 279.4 mm)
- Legal → 8.5 × 14 in (215.9 × 355.6 mm)
- A3 → 297 × 420 mm
Privacy
FAQ
Is my selection uploaded to a server?
No. Paper-size lookup runs entirely in your browser. Values are not sent to Every Tools.
What is the difference between A4 and Letter?
A4 is an ISO 216 size (210 × 297 mm). Letter is a common US size (8.5 × 11 in). They are close but not the same—Letter is slightly wider and shorter than A4.
Are dimensions portrait or landscape?
Values are shown as portrait width × height (the shorter side first for these standards). Rotate for landscape.
Why 25.4 mm per inch?
The international inch is defined as exactly 25.4 millimetres. ISO A sizes are defined in millimetres; US sizes are defined in inches.
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