Racira CAD

Scale Bar Tool

Scale input

Effective scale: 1:200(1 mm paper = 200 mm real)
Real-length unit

Bar geometry & style

One segment on paper5 mm
Full bar on paper100 mm
Full bar in real life20 m
Step count5

The width of the scale bar is 100 mm, representing 20 m in real life.

0 1.25 2.5 5 10 20

Scale 1:200 — 5 steps

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What is Scale Bar Tool

Scale Bar Tool draws a graphical scale bar — the annotated ruler that architects, engineers, and surveyors insert into drawing title blocks so anyone reading a plotted sheet can measure real distances directly without knowing which paper size was used or whether the sheet was reduced during printing. You choose the drawing scale (1:X, an architectural inch-to-foot ratio, or a numeric magnification factor), the real-world unit and the distance each segment represents, and the tool instantly computes the paper length of one segment, draws the bar in one of three standard styles, and exports it in SVG, PNG, PDF, or DXF format ready for insertion into any CAD application.
Three scale-input modes cover every workflow: One-to-X (1:50, 1:100, 1:200, and so on) for metric site plans and construction drawings; Inches-to-the-foot (¼″=1′-0″, ½″=1′-0″, etc.) for North American architectural drawings; and Scale factor (0.5×, 2×) for enlargements and reductions. The Toggle X button on the One-to-X mode flips between "1:X" (reduction — paper is smaller than reality) and "X:1" (enlargement — paper is larger), which matters when dimensioning micro-fabrication or printed circuit board details.

How to Use Scale Bar Tool

  1. Step 1 — choose a scale mode: For metric work select One-to-X and enter the denominator (50 for 1:50). For US architectural work select Inches-to-the-foot and enter the paper inches (e.g. 0.25 for ¼") and the real-side feet plus any extra inches (e.g. 1 foot, 0 inches = 1′-0″). For magnification or reduction enter the numeric factor and use Flip ÷ to switch between enlargement and reduction.
  2. Step 2 — set the real-length unit and segment size: Choose the unit your drawing dimensions are stated in — metres for a site plan, feet for an imperial floor plan, millimetres for a detail drawing. Enter how much real-world distance one bar segment should represent: 1 m, 5 ft, 500 mm, and so on. The tool recomputes paper segment length instantly.
  3. Step 3 — configure bar geometry: Set the total bar width in mm (80–120 mm is typical for A1/A0 sheets), the bar height in points, and the line weight. Choose Automatic steps (the tool picks a sensible count for the bar width and segment length) or Manual (enter the exact step count). Divided proportionally gives equal-width segments; Divided exponential puts a half-step first and then doubles — the traditional land-survey convention.
  4. Step 4 — choose a bar style: Double row (alternating black/white top and bottom halves, standard in architectural and civil drafting) is the most widely recognised style. Single row is cleaner for small-scale inserts. Line draws a ruled edge with tick marks, which is common in engineering and topographic mapping. Set the bar colour with the colour picker or type a hex value directly.
  5. Step 5 — download in the format you need: SVG is fully vector and editable in Inkscape, Illustrator, or any CAD tool that accepts SVG blocks. PNG rasterises at 4× for high-DPI printing. PDF embeds the bar as an image in an A4 page, usable in Word or InDesign. DXF exports actual SOLID and LINE entities in DXF R12 format, which every CAD application from AutoCAD to QCAD to LibreCAD can insert directly at the correct scale.
The core calculation is one division: paper length in mm = (real distance in mm) ÷ scale. A one-metre segment on a 1:50 drawing is 1000 ÷ 50 = 20 mm on paper. The label under each division tick shows the cumulative real distance, so readers measure from the bar rather than from a separate calculator.

Why Use Scale Bar Tool

A graphical scale bar is the only dimension annotation that survives photocopying, rescaling, and printing to non-standard paper sizes. A numeric scale note ("1:100") becomes wrong the moment the sheet is printed at 75% to fit a smaller plotter. The bar scales with the drawing — it is always right. That is why every ISO 5455 and ASME Y14.1 compliant drawing sheet carries a graphical scale bar in the title block, and why building permit submissions require one.
The DXF export is the highest-value output for working CAD users. Opening the downloaded .dxf file in AutoCAD, QCAD, or BricsCAD reveals three correctly-named layers: SCALE_BAR_FILL (solid-filled segments as DXF R12 SOLID entities), SCALE_BAR_OUTLINE (outlines and tick marks as LINE entities), and text labels as TEXT entities. The model-space coordinates are in millimetres, so a 100 mm bar drawn at 1:200 is exactly 100 drawing units wide — insert it into the title block, it fits. The layer separation means fill and outline can be frozen, colour-overridden, or plotted to different pens independently, matching how professional title block layers are managed.
The exponential step division option serves a specific land-survey convention: the first half-step is drawn to the left of the zero tick so the reader can estimate fractional values using that sub-unit interval. A four-step bar at 40 m total has steps 5 m, 5 m, 10 m, 20 m — the 5 m left extension lets the reader read to the nearest 5 metres on any division. If your drawing convention requires equal steps, proportional division gives uniform segments.

Privacy & Security

This tool runs entirely in your browser — no data ever leaves your device. There is no server round-trip, no upload, no logging, and no account required. Your input is processed locally using client-side JavaScript and is never stored, transmitted, or accessible to anyone else. When you close the tab, everything disappears.

Frequently Asked Questions

Why does the DXF use SOLID entities instead of filled rectangles?

DXF R12 SOLID entities are the native filled quadrilateral in the DXF standard — they are rendered as solid fill by every CAD application that reads R12, including AutoCAD 2000 through current, QCAD, LibreCAD, BricsCAD, and Vectorworks. Using SOLID entities means the fill is a real CAD entity, not a raster image, and can be recoloured, frozen, or plotted to a specific pen weight by layer. Drawing filled rectangles as four LINE entities (as some tools do) produces outlines only; the interior is unfilled and the bar looks wrong when plotted.

What does the inch-to-foot mode compute?

It computes scale = total real inches ÷ paper inches. For ¼″ = 1′-0″, the real side is 1 foot = 12 inches and the paper side is 0.25 inches, giving scale = 12 ÷ 0.25 = 48. All subsequent bar geometry uses that scale: a 1-foot segment on paper is 12 × 25.4 ÷ 48 = 6.35 mm. The optional extra real inches field handles non-zero-inch real sides such as ½″ = 1′-6″, where the real side is 18 inches and the scale is 18 ÷ 0.5 = 36.

Why are the two row styles (double and single) recommended over the line style for most drawings?

Filled bar styles survive printing noise better than a ruled line. On a heavily reproduced or faxed drawing, a line-style bar can look like a dimension line and be misread. The alternating black-white blocks of a double-row bar are unmistakeable as a scale bar from across a room. The line style is appropriate for topographic and engineering drawings that use the scale bar inside a dense annotation block where a thinner element is preferred, or where the convention specifies it explicitly.