Engineering paper
The five-to-the-inch green grid of an engineer's computation pad, bordered and printed at true size.
An engineer's computation pad is a specific object: pale green paper, a grid of five squares to the inch, a heavier line every fifth square so the inches read at a glance, and a printed border. The convention comes from pads where the grid was printed on the back of the sheet and showed through faintly, so a drawing could be laid out on the grid and then photocopied without the grid coming with it.
Five squares to the inch is a fifth of an inch, or 5.08 mm — very nearly but not quite the 5 mm of European graph paper. The difference is under two percent, which sounds like nothing until you scale a drawing off it and find every dimension is out by the same two percent. If a US course or a US drawing standard asked for engineering paper, it means the inch-based grid, and that is what this page opens at.
The green line colour and the border are set for you, as they would be on a pad, but both are ordinary controls — grey lines suit a scan far better than green does, and the border comes off with one click if you are pasting the sheet into something else.
The pale green and the border are set the way a pad would be, but both are just controls: grey lines scan far better than green, and the border comes off with one click when the sheet is going into something else. The spacing underneath stays 5.08 mm whatever you do to the colour.
Graph paper by ruling and geometry
- Graph paper, any rulingThe full generator — any spacing, six geometries
- Isometric graph paperVertical and 30° lines · for 3D sketching
- Hexagonal graph paperWhole hexagons, any side length, flat or pointy top
- Polar graph paperRings and spokes · any radial step, any spoke angle
- 5 mm graph paper5 mm squares · the metric standard
- 1 cm graph paper10 mm squares · big enough to write in
- Quarter inch graph paper6.35 mm squares · 4 squares per inch
- Half inch graph paper12.7 mm squares · 2 squares per inch
Questions
Is engineering paper the same as 5 mm graph paper?
No, though the two are close enough to be confused. Engineering paper is five squares to the inch, which is 5.08 mm. It is about 1.6 percent coarser than 5 mm paper — irrelevant for rough work, and not irrelevant if you are scaling dimensions off the drawing.
Why is engineering paper green?
Because the grid was traditionally printed on the reverse of the sheet in a pale green that showed through faintly, so it guided the drawing without reproducing when the sheet was copied. The colour stuck as a convention long after the reason for it did.
How do I check the grid printed at the right size?
Count five squares and measure: that distance has to be exactly one inch, or 25.4 mm. Five squares is the right test rather than one, because a single 5.08 mm square is too small to tell 5.08 from 5.00 with a ruler.
Other tools
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- Cross stitch pattern paperCharting paper at the size your stitches will actually be, for the count of fabric you actually have.
- English paper piecing templatesPick a shape, type the side length you actually want, and print it at true size.
- Bubble answer sheet generatorScantron-style answer sheets, built to your question count.
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- Blank periodic tableEvery blank periodic table online is a fixed image.
- Attendance sheet and gradebook gridsPaste twenty-eight names, choose a month, print.
- Printable graph paperAny spacing you like, in millimetres or inches, printed at true size.
- Printable dot grid paperDot paper at the spacing you actually use — 5 mm for a bullet journal, or whatever you type.
- Printable lined paperCollege ruled, wide ruled, or handwriting paper with a dashed midline — at the real spacings, not an approximation.
- Year in pixelsOne cell a day for a whole year, drawn for the year you name — so February is the right length and the months stop where they actually stop.
- Savings and goal colouring chartsType your goal and how many cells you want.
