How to Make an Accurate Ruler

Written by tessa holmes
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How to Make an Accurate Ruler
Rulers often display several units of measurement. (NA/ Images)

Rulers are used to measure length and have many applications, including math problems and crafting. Inaccurate rulers can skew measurement and cause faulty readings for projects. Though almost anyone can make a ruler with only a piece of paper, scissors, and a pencil, an accurate ruler should be made using another ruler for verification. Hand-drawing a ruler without double checking those measurements can result in an inaccurate ruler and false calculations.

Skill level:
Moderately Easy

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Things you need

  • Ruler
  • 8 1/2-by-11-inch paper
  • Scissors
  • Pencil

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  1. 1

    Measure 1/2 inch of paper lengthwise. With the scissors, cut off that 1/2 inch so that you are left with an 8-by-11 inch piece of paper. Double-check with your ruler to make sure that your paper is the right size.

  2. 2

    Fold your piece of paper in half lengthwise so that you have a 4-by-11 inch piece of paper. Then, fold the paper in half lengthwise one more time so that you are left with a 2-by-11 inch piece of paper. Press in the folds so that they crease and unfold the paper, laying it out flat.

  3. 3

    Mark three 2-inch long vertical lines with your pencil. The lines should go across the top of your paper, along the three creases that you created when folding your paper into quarters. Measure with your ruler to make sure that the space between the beginning of the paper and the first line is two inches long, the space between the first line and the second line is another two inches and that the space between the second and third line is another two inches.

  4. 4

    Near the bottom of the first vertical line, write "2 inches." Mark "4 inches" below the second vertical line and "6 inches" below the third. Fold the section of the paper before the 2-inch line in half and crease it, then open it back up. Continue to fold and crease the sections between the 4 and 6 inch lines in half. With your pencil, draw 2-inch lines along the vertical creases you have just drawn. Label the first line "1 inch," the second line "3 inches," the third line "5 inches" and the last line "7 inches." Check with you ruler to make sure that these markings are accurate.

  5. 5

    Cut off the excess paper if desired, leaving only your newly made inch ruler. You can make more rulers, measuring and marking half-inch and quarter-inch lines if you would like.

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