Frame Moulding Calculator — Total Length Needed
Calculate the total length of moulding needed including mitre waste.
Add allowance for mitre joint cuts
How We Calculate This
Perimeter = 2 x (Outer width + Outer height)
Mitre waste = 8 x Moulding width
The total moulding length is the perimeter plus mitre waste, multiplied by the number of frames. Mitre cuts at 45 degrees waste a triangular piece at each joint.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always verify quantities before purchasing materials.