How to print grid paper at exact scale

If a printed grid does not measure what it should, the cause is almost always the print dialog scaling the page to fit the printer's unprintable margin. Here is how to stop it.

1. Set scale to 100%

In Chrome or Edge, open the print dialog, expand More settings, and set Scale to 100. Make sure Fit to printable area is off. In Safari, choose Show Details and set scale to 100%. In Firefox, set Scale to 100% and uncheck Shrink to fit page width.

2. Check the calibration square

Enable Include calibration square before printing. It draws a 25.4 mm square in the corner of the sheet. Measure it with a ruler: if it is 25.4 mm (one inch), every grid measurement on the page is correct. If it is 24 mm, your printer scaled the page to about 94% and you should adjust the scale setting until the square measures true.

3. Know your printer's margin

Most home printers cannot print to the edge of the sheet. Typical unprintable margins are 4 to 6 mm, and some laser printers need more at the bottom. Set the generator's margin to at least 10 mm for inkjet printers and 12 mm if you plan to hole-punch the sheet. If lines are missing at the edges, increase the margin.

4. Pick the right paper size

• Letter (215.9 × 279.4 mm): the default in the United States and Canada.
• A4 (210 × 297 mm): the default almost everywhere else; slightly narrower and taller than Letter.
• Legal (215.9 × 355.6 mm): useful for long plots and full-page timelines.
• Tabloid (279.4 × 431.8 mm) and A3 (297 × 420 mm): for storyboards, large maps and wall planning.
• A5 (148 × 210 mm): for notebook inserts and pocket journals.

5. Save paper and ink

Use the grey or blue ink option for everyday work: black grids at full density are heavier on toner and visually louder under a lamp. Draft mode on most printers handles light grey grids well. If you print the same sheet often, print one copy and photocopy it, or laminate a single sheet and write on it with a dry-erase marker.

6. When the grid still looks wrong

Compare the printed spacing against a steel ruler across ten squares rather than one: a single square is hard to measure accurately, but ten squares amplify any error. If ten 5 mm squares measure 52 mm, the print scale is about 104%, which points to a driver-level scaling setting outside the browser dialog.