Paper Size Converter
Convert common document, drawing, and print sheet sizes into the units used by layout apps, export dialogs, and raster artwork. The table keeps finished sheet dimensions separate from bleed, margin, and printer scaling assumptions.
Live converter
Paper size inputs
Choose a standard paper size and compare its dimensions in millimeters, centimeters, inches, points, and 300 DPI pixels.
Selected size
210 x 297 mm
Series
ISO A
Short label
A4
Note
Common international document size.
Paper dimensions by unit
| Unit | Width | Height | Note |
|---|---|---|---|
| mm | 210 | 297 | Millimeters |
| cm | 21 | 29.7 | Centimeters |
| in | 8.268 | 11.693 | Inches |
| pt | 595.276 | 841.89 | PostScript points |
| px @300 | 2,480.315 | 3,507.874 | Pixels at 300 DPI |
How it works in three quick steps.
Choose a sheet
Select an ISO, US, or ANSI paper size.
Read dimensions
Review width and height in mm, cm, inches, points, and 300 DPI pixels.
Check print use
Use the notes to distinguish document, poster, and drawing sizes.
ISO and US sheets
Compare A-series sizes with Letter, Legal, Tabloid, and Ledger before exporting documents.
Design-unit checks
Use points and inches when moving between print layout tools and CSS or PDF settings.
Raster planning
Use the 300 DPI pixel estimate to plan high-resolution exports for finished sheet sizes.
How paper size conversion works
Paper sizes are stored as finished sheet width and height. Metric ISO sizes start from millimeter dimensions, while North American and ANSI sizes are inch-based and converted through the exact inch relationship. Pixel estimates multiply physical inches by 300 DPI. Use those pixels for image planning, not as a guarantee that a printer will reproduce every dot independently.
Treat paper size, imageable area, and pixel dimensions separately
A named paper size defines the finished sheet, not the printer's usable rectangle and not a raster file's detail. This converter keeps those concepts separate by showing physical dimensions first and making the 300-PPI pixel row an explicit planning estimate.
Representative sheet comparisons
The registry stores ISO dimensions in millimeters and North American dimensions through their inch definitions.
- A4
- 210 × 297 mm; approximately 8.268 × 11.693 inches.
- US Letter
- 8.5 × 11 inches; 215.9 × 279.4 mm.
- US Legal
- 8.5 × 14 inches; 215.9 × 355.6 mm.
- Tabloid
- 11 × 17 inches in portrait orientation.
- Ledger
- 17 × 11 inches in landscape orientation.
- A3
- 297 × 420 mm; two A4 sheet areas.
Understand the A-series relationship
ISO A-series sheets retain the same aspect-ratio system as successive sizes are obtained by halving the longer side, subject to the standard's integer-millimeter dimensions. That makes A4-to-A3 or A4-to-A5 scaling predictable.
North American Letter and Legal do not share the A-series aspect ratio. A document can therefore reflow, crop, or change margins when a print dialog substitutes Letter for A4 even though the two sheets look similar at a glance.
Calculate raster size from a declared assumption
The pixel row multiplies physical inches by 300. For A4, the inch conversion produces non-integer pixel values, while a raster image must ultimately use whole pixels. Round according to the export workflow and verify whether the application resamples.
Changing only a DPI metadata field does not create image detail. Pixel dimensions, physical output size, and resampling behavior must all be checked before a raster file is judged ready for print.
Add bleed and margins outside the finished-size result
The converter reports the trimmed sheet. If artwork extends through the cut edge, follow the printer's requested bleed specification and add it to both sides of each dimension.
Desktop printers often have non-printable hardware margins. A file that matches the sheet exactly can still be clipped or scaled unless borderless output is supported and deliberately selected.
Worked check: prepare an A4 raster reference
- 1Select A4 and keep the defined finished size 210 × 297 millimeters.
- 2Read the displayed inch conversion, approximately 8.268 × 11.693 inches.
- 3Use the 300-PPI row as a planning estimate, then choose whole-pixel export dimensions and confirm bleed, imageable area, and scaling with the target print provider.
Regional and print-production limits
- The named size does not indicate paper weight, coating, grain direction, tolerance, printer tray availability, or finishing method. Those are separate production specifications.
- Tabloid and Ledger share physical dimensions but reverse orientation. Software names can vary, so verify width and height rather than relying on the label alone.
- Browser and PDF print dialogs can choose fit, shrink, or a substituted tray size. Use actual size or 100 percent and measure a test output when dimensional accuracy matters.
Sources and definitions
- ISO 216: writing paper and printed matter
Official standard record for ISO A- and B-series trimmed paper sizes.
- NIST SP 811, Appendix B
Authoritative conversion factors for millimeters, inches, and related print units.
Paper size questions
Which paper sizes are included?
The converter includes ISO A0 through A6, US Letter, Legal, Tabloid, Ledger, and common ANSI drawing sizes. Each size is shown in millimeters, centimeters, inches, points, and pixels at 300 DPI so print and layout checks can use the same reference.
Why does the pixel result use 300 DPI?
Three hundred DPI is a common print-preparation reference for high-quality raster output. The converter uses it as a practical planning value, not as a requirement. Some printers and workflows may use different effective resolutions.
Is A4 the same as US Letter?
No. A4 is 210 x 297 mm, while US Letter is 8.5 x 11 inches, or 215.9 x 279.4 mm. They are close enough to cause layout mistakes, so documents should be checked before printing across regions.
What is the difference between Tabloid and Ledger?
Tabloid and Ledger use the same physical sheet size, 11 x 17 inches, but the orientation is different. Tabloid is usually portrait-oriented and Ledger is usually landscape-oriented in office and print contexts.
Can I use this for print bleed?
The converter gives finished sheet dimensions. If a printer requires bleed, add the bleed amount to each edge before exporting artwork. For example, 0.125 inch bleed adds 0.25 inch to total width and height.