Using CSS pixels as millimetres
Screen pixels vary by device and zoom; they are not a physical print unit.
Store layout in mm or inches and convert only at a declared DPI.
label size calculator
Calculate label dimensions without guessing at print scale
Enter physical label and paper dimensions to understand how units, gaps, margins and DPI interact. The calculator distinguishes display pixels from print size, helping you prepare a layout that can be printed at 100% rather than fitted unpredictably to the page.
Label sheet capacitySimple rectangular grid calculator
Estimated capacity
213 columns × 7 rowsCheck manufacturer tolerances and printer non-printable areas before committing stock.A practical workflow
How to use it
- 01
Measure the actual stock
Record label width, height, horizontal and vertical gaps and page margins.
- 02
Choose units and DPI
Use physical units for layout and the printer's real target DPI only for raster conversion.
- 03
Print a calibration page
Export a test, disable fit-to-page and measure the printed reference before the production batch.
Avoid rework
Common errors and precise fixes
Ignoring non-printable margins
A mathematically fitting grid may still be clipped by the printer or driver.
Use measured margins, a safe area and the calibration workflow for the actual device.
Know the limits
The calculator cannot know a printer's unreported hardware margins or feed drift.
Raster dimensions may require integer rounding; vector PDF remains preferable for precise output.
Questions, answered
Before you continue
How many pixels is one millimetre?
It depends on DPI: pixels = millimetres ÷ 25.4 × DPI. Keep fractional math internally and round in a way that preserves final physical size.
Can the calculator guarantee labels align?
No. It establishes geometry, while the printer, driver, feed and stock introduce tolerances. Use a 100% calibration print and enter measured offsets.