Mm Ruler Printable

Need a millimetre ruler right now? Choose the length and style, print at 100% and check the 100 mm test bar against a card or a real ruler. There’s also a tape measure you can cut out and glue together, and a quick practice game for learning to read millimetres.

How to print a ruler at true size

1. Choose the ruler length, style and paper size above.
2. Press Print and set scaling to 100%, “Actual size” or “None” — not “Fit to page”.
3. Measure the red 100 mm check bar with a real ruler or a bank card (85.6 mm wide).
4. If the bar is off, check the printer settings and try again; don’t trust the ruler until it matches.
5. Glue the printed ruler to card stock and cut it out for a sturdier tool.

Home printers are usually accurate to within about half a millimetre over 100 mm when scaling is off, which is fine for crafts and quick checks but not for precision work.

Reading a millimetre ruler

On a metric ruler, the long numbered lines are centimetres, the medium line halfway between is 5 millimetres, and each small line is one millimetre. To read a length, count the whole centimetres, multiply by ten, and add the small marks: 4 whole centimetres and 7 small marks make 47 mm, or 4.7 cm. For half-millimetre readings, estimate halfway between two marks. The practice game above picks random points so you can check your reading.

Worked example

A jeweller needs to check bead sizes, so they print four 15 cm mm-only rulers on A4 with 5 mm labels, measure the red check bar at exactly 100 mm, and glue one ruler to card. A sewer printing the 150 cm tape on US Letter gets nine strips; after cutting and gluing each under the previous strip’s tab, they check the finished tape at 50 cm and 100 cm against a yardstick before measuring for a dress.

mm, cm and inches

The dual ruler shows inches in sixteenths on the lower edge, so you can compare directly.

Checking your printer’s accuracy

Printers can shrink or stretch a page slightly, and the error is not always the same across and down the page. Measure the 100 mm check bar, then measure a ruler printed in the other direction (a landscape page turns it 90°). If one direction is off by more than about half a millimetre per 100 mm, look for a “scale”, “fit” or “borderless” option that is still switched on, or try a different application — some PDF viewers apply their own shrink-to-fit. For a quick sanity check without another ruler, a standard bank or ID card is 85.6 mm wide and 53.98 mm tall.

Making a sturdier ruler

• Print on heavier paper or card stock (160–200 gsm) if your printer can feed it.
• Or glue the printed ruler to a strip of card or thin plywood with a glue stick, pressing out air bubbles.
• Cover it with clear packing tape or laminate it to protect the markings.
• Cut along the edge closest to the zero mark so the scale starts right at the end, or leave a margin and measure from the zero line.
• For the tape measure, glue the strips to ribbon or twill tape so it bends around a body or a curved object without tearing.

Teaching children to measure

Start with whole centimetres, then introduce millimetres as the “little marks”. Ask children to measure everyday things — an eraser, a coin, a crayon — and write both the mm and cm values, such as 38 mm = 3.8 cm. The practice game is useful for quick drills: read the arrow, type the value in millimetres and check. Once millimetres are secure, the dual ruler helps show why 2.54 cm makes an inch.

Uses for printable rulers

• Measuring beads, screws and small parts.
• Craft, scrapbooking and paper projects.
• Teaching children to measure in mm and cm.
• A tape strip for body and sewing measurements.
• Checking ring sizes and jewellery dimensions.
• Quick checks when a ruler isn’t at hand.

Privacy

Rulers are drawn in your browser; nothing is uploaded.