The two paper sizes that matter
Every printable calendar on PrintCalendars is built to print at 100% scale on either US Letter (8.5 × 11 in) or ISO A4 (210 × 297 mm) paper. The grid uses absolute pixel widths chosen so that the thinnest line — the inner cell border — remains crisp at 300 dpi on both sizes. You should never need to enable browser scaling or "fit to page" to get a usable result.
Browser print settings that always work
Open any monthly printable, click the Print button, and use these settings: scale 100%, margins set to Default (about 0.4 in / 10 mm), headers and footers disabled, and background graphics enabled so the federal-holiday amber shading prints. Choose the orientation that matches the layout you opened — portrait for the default Sunday-start layout and the Monday-start layout, landscape for the landscape variant.
Why background graphics matter
The single most common reason a printed calendar comes out wrong is the "Background graphics" toggle. By default Chrome, Edge, and Safari turn background printing off — which makes the federal-holiday shading and the dark header bar disappear. Always enable it for PrintCalendars layouts. The shading is the only visual cue that distinguishes a federal holiday from a regular weekday on a printed sheet.
Color vs grayscale printers
The amber holiday shading was chosen because it survives the trip through a grayscale laser printer. On color it prints as the warm butter tone you see on screen; on monochrome it prints as a pale gray that is still distinguishable from a regular cell. Either way the day numbers stay legible.
A4 vs Letter — what changes
A4 is slightly taller and slightly narrower than US Letter. The PrintCalendars grid is designed inside the smaller of the two safe areas, so a single PDF or browser print will fit either size with the default margins. If you need an A4-trimmed result on a Letter printer (or vice versa), use your printer's built-in paper-size mismatch handling rather than browser scaling — the result is sharper.
Saving as PDF
To save a calendar as a PDF instead of printing, choose "Save as PDF" as the printer destination. The result is identical to a print and can be shared with families, attached to a school newsletter, or batch-printed at a copy shop without losing the holiday shading.