Read long-point dimensions in a mitered frame.
Why are mitered cut lengths larger than the inside opening?
Use the matching calculator
Use this decision sequence
- Measure the required inside opening width and height.
- Use the supplied visible frame face width.
- Add twice that face width to each corresponding long-point dimension.
- Keep four piece lengths in the cut list before planning source-stock allocation.
Keep the quantities distinct
| Quantity or assumption | How to use it |
|---|---|
| Inside dimension | The finished clear opening. |
| Long-point dimension | Includes the two outward miter extensions. |
| Stock order | Also depends on kerf and how cuts fit source lengths. |
Worked comparison
For an inside opening 1 m by 2 m and a 0.10 m face width, two horizontal pieces are 1.2 m at the long points and two vertical pieces are 2.2 m. Combined long-point length is 6.8 m per frame.
Check before using the estimate
Adding long-point lengths is not the same as proving those cuts fit a particular stock order.
All dimensions, product properties, prices and specifications in this example are illustrative arithmetic inputs. Use the values from your measured plan, selected product data sheet and supplier quote. This guide does not choose construction specifications or certify safety.
Calculation and scope checked 2026-10-04. Methods and scope.
Related decisions
Keep butt-joint face-frame cuts separate from miter long points
Do rails fit between continuous stiles or meet at mitered corners?
Apply banding cut allowance to every selected edge
Is end trim counted per panel or per banding cut?
A reproducible two-stock cut plan can still cost more than another plan
Does choosing the cheapest feasible new stock prove the cheapest full order?
State end-cut angles relative to square before calculating blanks
Is a supplied angle measured from a square end or from the board edge?