Miter Angle Calculator
Find equal miter cuts for a corner or regular polygon.
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What this tool does
Find equal miter cuts for a corner or regular polygon. Both parts share the angle equally; saw setting is measured from a square crosscut.
How to use the Miter Angle Calculator
- Enter or select interior corner angle (degrees).
- Read the calculated result; change any measurement to compare alternatives.
Formula
miter saw setting=(180−interior corner angle)/2
- corner
- Interior corner angle (degrees)
Both parts share the angle equally; saw setting is measured from a square crosscut.
Worked example
For miter angle calculator, the following measurements illustrate the exact method: Interior corner angle (degrees): 90.
Inputs
- Interior corner angle (degrees)90
Result
- Miter saw setting (degrees)45
Results explained
- Miter saw setting (degrees)
- Miter saw setting (degrees) from the formula above. Both parts share the angle equally; saw setting is measured from a square crosscut.
Frequently asked questions
Subtract the interior corner angle from 180 degrees, then divide by two.
Use actual measured thickness and width unless your supplier explicitly prices on nominal rough dimensions. A nominal 2 × 4 is typically 1.5 × 3.5 inches after surfacing.
No unless a waste input is shown. Add stock for end trimming, defects and kerf rather than treating the computed total as a guaranteed cut plan.
Length inputs with a unit can be switched to metric; internal formulas keep a consistent inch/foot basis. Board foot outputs remain board feet.
Unequal-width trim or unequal miters requires a different layout.