Floor plan graph paper
Quarter-inch squares with inch markers, ready to use at the ¼ inch = 1 foot scale that architectural drawings conventionally use.
Opens with these settings already loaded. Change anything you like, then download as PDF, PNG or SVG.
Quarter inch equals one foot
This is the standard residential drawing scale, and on quarter-inch paper it is beautifully simple: one square is one foot, and every heavy line is four feet. A 12 by 14 foot bedroom is twelve squares by fourteen. No conversion, no scale rule, no arithmetic.
Measure the room properly first
Measure wall to wall at floor level, and record door swings, window positions and widths, radiators, and where the outlets are. Almost every furniture-arrangement plan that fails does so because a door swing or a radiator was left off, not because the measurements were wrong.
Cut furniture to scale
Rather than drawing furniture in, cut rectangles to the same scale from a second sheet and move them around. A sofa 7 feet long is seven squares. Being able to shove pieces about beats erasing, and you will try arrangements you would never have bothered to redraw.
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.