Online RulerWhen to Use a Physical Ruler
Use a physical ruler for short measurements that decide whether parts will fit. Use a tape measure when the distance runs past the usable ruler length. AR Ruler's calibrated screen scale is practical for a small object you can place beside the marks with both ends in view.
- A physical ruler lets you compare a part and its mating surface directly at the workpiece.
- A tape measure lets you span a longer distance without moving the starting point between readings.
- The AR Ruler website and desktop or extension ruler offer centimeters or fractional inches. The movable marker shows its distance from zero.
- Identify the surfaces that set the fit, such as the outside edges of a part or the inside faces of an opening.
- Choose a ruler or tape that covers the entire span with readable marks at both ends.
- Put zero at the starting surface, keep the scale straight along the span, and look straight at the end mark.
- Check the part and opening in the same unit. If the opening may vary, measure along the path the part will take and use the tightest reading.
Measure at the point of fit
For a drawer insert, measure between the inside walls where the insert will sit. Check any lip, screw head, or divider that could narrow the path as you lower it. Measure the insert across the matching outside faces. Compare those readings before you cut material or commit to a size. If the gap you need is smaller than you can read on your ruler, use a measuring tool with marks fine enough for the job.
Cover the full distance
For furniture or a long board, measure from the actual starting surface to the far end with a tape that reaches both points. Keep the tape straight and supported where it might sag. For an opening, check the span where the item will pass through as well as where it will sit. If a reading is hard to see, reset the tape at the same starting surface and take the full reading again.
Use the screen for small items
Place the object flat beside the calibrated screen scale if it can rest there safely. Line up its near edge with zero and look straight down as you move the marker to the far edge. Check the calibration after a browser zoom or display change. On supported Android hardware, AR Ruler Play can use optional ARCore for distance measurements. If a long reading will decide a fit or a cut, check that span at the workpiece with a tape.
Can I use the edge of my ruler as zero?
Check where the zero mark sits. If it is inset, align that mark with the start. If the start is hard to reach, use another marked line and subtract its reading from the end reading.
What if my readings differ across an opening?
Record where each reading was taken. Use the smallest clear span along the route the part must pass through, and check the space where the part will sit.
Can I measure a long item in short segments?
You can add the segments, but each new starting mark is another place for a gap or overlap. Use a tape that covers the full span when the reading will decide a fit.