How to Cut a 90-Degree Angle in Wood

Written by floyd drake iii
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How to Cut a 90-Degree Angle in Wood
A mitre box makes professional saw cuts easy. (Jupiterimages/ Images)

To get a piece of moulding to look and fit just right, an angle needs to be cut properly. This is done using a mitre box and a hand saw, or using a protractor to measure the angle. Proper measurements are key to cutting correct angles A mitre box is a wood or plastic box that has corresponding slots on either side that are placed for cutting different angles. A protractor, like the ones found in high school geometry classes, can also be used, which, when the angle is determined, identifies the proper path to cut.

Skill level:
Moderately Easy

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Things you need

  • Hand or power saw
  • Mitre box
  • Tape measure
  • Protractor
  • pencil

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    Mitre box

  1. 1

    Measure the length of the wood with a tape measure at the position you want the 90-degree angle to be. Mark the outside of the wood, identifying the longest point of the angle.

  2. 2

    Place a piece of scrap wood in the mitre box to prevent the saw from damaging the box.

  3. 3

    Place the wood to be cut inside the mitre box, aligning the pencil mark with the uppermost point of the 90-degree angle slot. Pace the hand saw in the 90-degree angle slot and cut the wood, making sure to hold the wood firmly to prevent it from moving.

    Using a protractor

  1. 1

    Measure the wood with a tape measure to determine the farthest point of the angle location and mark it with a pencil.

  2. 2

    Align the middle of the protractor's flat side so that the pencil mark appears in the middle, which is marked on the protractor. Find the corresponding 90-degree angle mark on the curved portion of the protractor and mark the wood directly under it.

  3. 3

    Draw a line connecting the two marks on the piece of wood. This is your 90-degree angle. Cut the wood with either a hand or power saw, making sure the wood is firmly held to prevent slippage.

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