Use this construction calculation for preliminary quantity, geometry, material, load, or coverage planning when dimensions and units have been measured consistently.

Trench length (m)

Required number input.

Supported depth (m)

Required number input.

Find the face area of shoring on both vertical trench sides; excludes end walls, bracing, and overlaps. 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]

Two-sided board area (m²)

The resulting two-sided board area returned as a number.

• A quantity estimate or simplified engineering formula is not a building-code check, stamped design, manufacturer approval, or site inspection. Material properties, tolerances, waste, moisture, workmanship, loads, local conditions, and code requirements can change the result.
• 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.

Verify dimensions on site, use current product data and local code requirements, include an explicit waste or safety allowance where appropriate, and obtain qualified structural, electrical, plumbing, or geotechnical review when required.

• Footing Bearing Pressure

  Calculate average bearing pressure from centered vertical footing load and effective contact area; excludes eccentricity and soil capacity checks.

• Theoretical Rafter Length

  Find the straight-line rafter length between eave and ridge from horizontal run and vertical rise; excludes overhang and cuts.

• Blocks Per Wall

  Round up block count from net wall face area and the installed module face area including mortar joints.