Seating chart template
Two-centimetre squares in landscape — one square per desk, large enough to write a name in.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
Coarse squares, one desk each
A seating chart needs a grid you can write into, not a fine one. Two-centimetre squares in landscape give roughly thirteen columns by nine rows, which is one square per desk with room for a first name and a surname initial. Landscape also matches the shape of most classrooms seen from the front, so the chart reads the way the room actually looks.
Draw the room, not just the seats
Mark the door, the board, the windows and your own desk before placing anybody. Where a student sits only means something relative to those things — near the door matters, back row by the window matters — and a chart showing names in boxes with no reference points has thrown away most of the information you were trying to record.
Print several and rearrange on paper
Seating plans get changed, and it is much cheaper to change them in pencil than in the room. Print half a dozen, keep the versions that worked, and over a term they become a useful record of what you tried. For a substitute teacher, a clean copy with the date at the top is worth more than any amount of written explanation.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100% — not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.