How to Determine an Angle Without an Angle Finder


A common type of improvement that you can do in an old home is to replace the existing windows with new or replacement windows. However, when ordering a new window, you will need to have specific measurements. One of the measurements you will need is the angle of the sill. If you do not have an angle finder available, you can find the angle of a windowsill by using tools that you may have around your home.

Things You'll Need

  • Cloth or rag
  • Carpenters square
  • Pencil
  • Ruler or tape measure
  • Paper
  • Clean off the windowsill with a damp cloth or rag to remove any dirt or debris that could effect the measurement.

  • Place the right angle or base of a carpenters square on the stile of the window sash. The stile is also known as the outside stop of the window.

  • Find the 2-inch mark on the carpenter's square and make a mark on the windowsill with the pencil.

  • Place a ruler or tape measure on the mark you made in Step 3 and the 2-inch mark on the carpenter's square. Measure the distance or rise between the windowsill and the bottom of the carpenters square.

  • Make a note of the measurement on a piece of paper.

  • Compare the measurement from Step 4 to the sill angle chart on the Spencer Works Web page to find the angle of the sill.

Tips & Warnings

  • If you do not have the carpenters square in the right place on the window sash, your measurements will be incorrect.

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  • Photo Credit carpenter image by Greg Pickens from
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