Printable protractor.
Start at the right zero.

Align the center and baseline, then follow the scale beginning at zero on your starting ray. Practice acute, obtuse and reflex angle checks.

Choose US Letter or A4 for prepared downloads. Original PDF and SVG files, worksheets and reference answers are free without signup. Collection packs contain the same individual pages in order.

The 180° file has 1° ticks, longer 5° and 10° marks, and two opposing label rows. On our template the outer row begins at 0° on the right. Other protractors can label their rows differently, so use the row that starts at zero on your chosen ray instead of memorizing a universal inner-versus-outer rule.

The 360° file marks 0° right, 90° up, 180° left and 270° down, increasing counterclockwise. To compare 300° with 25°, cross the zero direction: 60° + 25° = 85°. The reflex complement is 275°. Uniform resizing preserves angle geometry, but unequal stretching can change it. These templates have digital geometry checks and no physical calibration or precision-instrument certification.

1. Aligning the Baseline Correctly Place the center cross on the angle vertex. Align the zero direction with one of the rays before following the other ray to the degree ticks. The 180° template has a straight baseline; the 360° template marks a zero ray from the center toward the right. Keep the center fixed when rotating a protractor to match an angle. A shift in the center and a wrong choice of zero are different errors, so check them separately. If the print is stretched differently horizontally and vertically, the apparent angular distances can change even when its labels still look evenly ordered.
2. Reading the Correct Scale The semicircular template has two opposed scales. On this particular file, the outer scale reads 0° on the right and 180° on the left; the inner scale reverses that order. Those labels are not a universal rule for every commercial protractor. Follow whichever scale starts at zero on your chosen starting ray. PA01 starts on the right and ends at 37°, so it is acute. PA02 begins on the left and its other ray is at 56° measured from the right, giving 180° − 56° = 124°, an obtuse angle.
3. Verifying Print Accuracy Print the resource at one hundred percent scale to maintain geometric integrity. Uniform scaling preserves the accuracy of angles, but nonuniform horizontal or vertical distortion will alter the measured values. Use a standard paper size and avoid stretching the image during printing. Since the file is vector based, one degree ticks and ten degree labels remain sharp. Note that digital verification of tick and angle geometry has been completed, but physical printer tests have not been performed. Check that the center and baseline marks are clearly visible and correctly positioned relative to the scale numbers after printing.

Print the PDF matching the paper in your printer at Actual size / 100% if you want to retain the millimeter dimensions defined in the file. Turn off Fit and Shrink when those dimensions matter. Uniform resizing preserves relative image proportions and angles but changes physical lengths. Unequal resizing can distort both. SVG editors and browser print dialogs can also change scale, so measure a physical calibration span when the task relies on size.

These files have digital geometry and layout checks. Physical printer testing has not been completed. Complete a student page before comparing the worked answer or reference illustration. A geometric or counting result can be exact, while a hand drawing can vary in its marks and interpretation. The original resources use CC BY 4.0: credit Zumola, link the license and indicate changes.

Further reading: Math Is Fun: aligning and reading a protractor. The downloadable illustrations and exercise data are original Zumola work.