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Free Printable Scale Ruler for Plans and Blueprints

Need a quick way to measure a plan when your scale ruler is in the truck? Download our free printable scale rulers. One page holds five rulers: 1/8″, 1/4″ and 1/2″ = 1′-0″ architectural scales, plus metric 1:50 and 1:100. Each one is about 7 inches long.

PDF files print true to scale. Prepare the file at the intended physical dimensions and choose the matching sheet size. Check the drawing’s stated dimensions before using a print for measurement.

Download the free scale ruler PDF

What’s on the sheet

  • 1/8″ = 1′-0″: common for site and floor plans of larger buildings. Reads 0–56 ft.
  • 1/4″ = 1′-0″: the usual residential floor-plan scale. Reads 0–28 ft, with half-foot ticks.
  • 1/2″ = 1′-0″: for details, stairs and kitchens. Reads 0–14 ft, with 3-inch ticks.
  • 1:50 (metric): 1 cm on paper = 0.5 m. Reads 0–9 m.
  • 1:100 (metric): 1 cm on paper = 1 m. Reads 0–18 m.

How to print it so it’s accurate

  1. Open the PDF in a desktop PDF reader.
  2. In Print settings choose “Actual size” or “100%”. Turn off “Fit to page” / “Shrink oversized pages”.
  3. Print on plain letter paper.
  4. Measure the 1-inch and 50 mm test bars with a real ruler or tape. If either is off, your printer rescaled the page. Fix the setting and reprint.
  5. For a sturdier tool, glue it to card stock and cut along the edges.

How to check if a plan print is to scale

  1. Find a written dimension. Find a dimension written on the drawing, for example a wall labeled 12′-0″.
  2. Lay the matching ruler on it. At 1/4″ scale a 12′-0″ wall should measure exactly 3 inches on paper.
  3. If it doesn’t match, check the sheet size. The sheet was printed at the wrong size, often because a 24×36 drawing was shrunk to fit smaller paper. Check the title block for the intended sheet size.
  4. Look for a graphic scale bar. Bars stay correct even when a print is resized; written scales (1/4″ = 1′-0″) don’t.
  5. Trust written dimensions. When in doubt, trust written dimensions over measured ones. Many plans say “Do not scale drawings” for this reason.

More detail: how to print a PDF to scale · how to read an architect’s scale · how to measure a PDF drawing to scale · what quarter-inch scale means · blueprint scale guide.

Printing the full plan set?

Most home-office printers handle letter or tabloid paper. Larger plans need a wide-format printer or tiled printing at 100%. Print My Plans offers six sizes from 17×22 to 36×48 on 20 lb bond: $1.95 per B&W sheet or $3.75 color. Prints ship rolled in protective tubes. See pricing.

Frequently asked questions

Is the ruler really free?

Yes. Download, print and share it. No sign-up.

Can I use it on a 24×36 plan?

Yes, as long as the plan was printed at its intended full size.

Why does my ruler print short?

“Fit to page” is on. Print at 100% / Actual size and check the 1-inch test bar.

Can I link to or share this page?

Yes. Teachers, bloggers and builders are welcome to share the download or link to this page.

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Free printable scale ruler from Print My Plans

Order by 3 PM ET, ships same day. Delivery timing depends on the shipping service and destination. See the terms for business-day and holiday details.

Free Printable Scale Ruler for Plans | Print My Plans