How to measure angles fri cutting base trim without angle tool

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Forum topic by 70445 posted 07-02-2010 06:52 PM 3792 views 0 times favorited 4 replies Add to Favorites Watch
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18 posts in 3709 days

07-02-2010 06:52 PM

How do you dertmine a angle for trim (base)without a angle tool? I’ve seen it done using wood blocks, but cannot rembemr how…anyone

4 replies so far

View NathanAllen's profile


376 posts in 3137 days

#1 posted 07-02-2010 08:54 PM

For outside you take two boards, lay one flat against the outside wall with a couple inches of the board extended beyond the corner. Place the other against the other wall on top of the first board. Mark the line with a pencil and voila, take a protractor, divide by two and you have the angle.

Inside miters are more of a pain, you have to create a set of setup blocks, but for inside you should be coping so the angle won’t affect the final cuts.

View davidpettinger's profile


661 posts in 3193 days

#2 posted 07-02-2010 09:36 PM

For inside miters from DIY.

-- Methods are many,Principles are few.Methods change often,Principles never do.

View Kent Shepherd's profile

Kent Shepherd

2718 posts in 3279 days

#3 posted 07-02-2010 11:29 PM

I’ve used Nathan’s method several times. If you don’t have a protractor, place the marked piece on the miter saw, eyeball the mark and line up the saw with it. when the saw matches the mark, you will know the angle. Then divide by 2 as Nathan said. The protractor would be easier though.


View woody57's profile


650 posts in 3420 days

#4 posted 07-04-2010 01:06 AM

you are right. I have used the saw like that many times.
If I don’t forget to bring the protractor I prefer it.

-- Emmett, from Georgia

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