Online RulerHow to Read Quarter-Inch Marks
Split the space between two whole-inch marks into four equal parts. The three lines that mark those parts are 1/4, 1/2, and 3/4 inch past the first whole inch. If an edge lands at the last of those lines after 2 inches, its reading is 2 3/4 inches.
- The 1/4 mark is halfway between a whole inch and the half-inch mark that follows it.
- Two quarters make a half inch. The middle line represents both 2/4 and 1/2.
- The 3/4 mark is halfway from the half-inch mark to the next whole inch.
- Choose the edge labeled in inches. Find two consecutive whole-inch numbers to see the span you will divide into quarters.
- Locate the center line between them. Then find the line halfway between the center and each whole-inch boundary.
- Place the object's starting edge at zero. Look straight down where the other edge meets the ruler, then find the whole-inch mark at or just before it.
- Read the part after the whole inches as 1/4, 1/2, or 3/4. If the endpoint is on a numbered line, write just the whole-inch reading.
Pick out the quarter lines
On many fractional rulers, the half-inch line extends farther than the quarter-inch lines. Use that longer line as a starting point, then check spacing. On an inch divided into eighths, the quarter lines are two small spaces to either side of the center. On a sixteenth-inch scale, they are four small spaces away.
Read to the nearest quarter
Use the quarter-inch line or whole-inch line closest to the endpoint. An edge just past 3 1/2 inches may still round to 3 1/2. An edge closer to 4 inches than to 3 3/4 inches rounds to 4 inches. Compare the gaps on both sides before writing down a rounded reading.
Mark a quarter-inch offset
For a line 1/4 inch in from the edge of a sheet, place the ruler across the sheet with zero at the edge. Make a dot at 1/4 inch. Repeat farther down the same edge. Put the ruler along the two dots and draw the line through them. A separate check at each dot helps catch a ruler that shifted.
How do I tell 1/4 from 3/4?
Read from the lower whole-inch number toward the higher one. The quarter line before the midpoint is 1/4. The quarter line after it is 3/4.
How many quarter-inch spaces are in 2 inches?
There are eight. Count four spaces in the first inch and four in the second, with the middle whole-inch line as their shared boundary.
What if the ruler starts with a blank margin?
Set the object against the printed zero line. A margin before that line is outside the measured span. Check where the scale starts before taking the reading.