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Picture Frame Moulding and Glazing

Relate picture, mat, moulding and rabbet dimensions to the captured rectangular frame model.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A 30 by 20 cm picture, 2 cm mats, 3 cm moulding and 0.5 cm rabbet gives a 39 by 29 cm outside frame.

Outside height = picture height + 2 × mat height + 2 × moulding width − 2 × rabbet

Worked example

Enter these known values and leave the other values blank.

Get the frame size for your:
Picture
Picture height
30 cm
Picture width
20 cm
Mat height
2 cm
Mat width
2 cm
Border width
3 cm
Rabbet width
0.5 cm
Fudge factor
5 mm
Glaze height
34 cm
Glaze width
24 cm
Inner frame height
33 cm
Inner frame width
23 cm
Outer frame height
39 cm
Outer frame width
29 cm

Assumptions and limitations

  • The rabbet overlap is subtracted twice from each outside dimension; glazing adds that overlap back to the inner opening. Confirm the supplier dimensions and cutting convention before ordering.
  • The extra cutting allowance applies to each of four pieces. The initial allowance unit is millimeters, while the other example measurements use centimeters. This layout does not optimize waste, defects or joinery.

Common questions

How should I interpret this result?

The rabbet overlap is subtracted twice from each outside dimension; glazing adds that overlap back to the inner opening. Confirm the supplier dimensions and cutting convention before ordering.

Can I solve a missing input?

Clear the value you want to find, enter compatible known values, and check the displayed units. Some choices and one-way outputs cannot be solved backward.

References

The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.

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