Use this workshop calculation to turn measured dimensions and the selected construction convention into a cut, spacing, fit, or material-planning value.

Outer width (mm)

Required number input.

Outer height (mm)

Required number input.

Outer depth (mm)

Required number input.

Panel thickness (mm)

Required number input.

Count the side, top, bottom, and back panels of a box carcase with a one-thickness back reveal. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Left sides

The resulting left sides returned as an integer.

Right sides

The resulting right sides returned as an integer.

Bottoms

The resulting bottoms returned as an integer.

Tops

The resulting tops returned as an integer.

Backs

The resulting backs returned as an integer.

Back panel reveal (mm)

The resulting back panel reveal returned as a number.

• Nominal dimensions, kerf, moisture movement, hardware clearances, wall squareness, and manufacturer instructions can change the required shop dimension. Measure the actual assembly and test critical joints on scrap before cutting finished material.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Complement the calculated dimension with a physical story stick, dry fit, or full-size layout. Follow the hardware, coating, adhesive, or machine manufacturer's limits where they differ from a rule of thumb.

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