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Soffit and fascia calculator
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Soffit & Fascia Calculator

Calculate fascia board, soffit board, barge board, and all accessories for each elevation of a roof. Supports uPVC, timber, aluminium, and composite systems with joint covers and corner pieces.

Soffit & Fascia Calculator

Fascia, soffit, barge board, and accessories - by elevation with joint cover and corner counts

Low maintenance, available in white and woodgrain finishes. Standard board length 5 m. No painting required.
Eaves depth - wall face to back of fascia. Measure on site.
10%
10% standard; 15% for complex rooflines with many hips or valleys

Elevations

Enter total counts for the whole job. Corner pieces are sold separately from board lengths.
Outside corners of the building
Inside corners (e.g. bay windows, re-entrant angles)
Caps at open ends of fascia / soffit runs

Job Costing (optional)

Per linear metre of eaves run

Results

Linear Metres & Board Counts

Total Eaves Run
-
linear metres
Fascia Boards
-
lengths
Soffit Boards
-
lengths

Accessories

Joint Covers
-
fascia + soffit
External Corners
-
pieces
Internal Corners
-
pieces
Stop Ends
-
pieces

Elevation Breakdown

Elevation Eaves Run Fascia Lengths Soffit Lengths Barge LM Joint Covers

Fascia, Soffit & Barge

  • Fascia board - The vertical board fixed to the rafter feet along the eaves. The guttering brackets fix to this board. Width typically 100-225 mm depending on rafter depth.
  • Soffit board - The horizontal (or near-horizontal) board that encloses the underside of the eaves between the fascia and the wall. Can be vented or solid.
  • Barge board - The diagonal board at gable ends of a roof, running along the verge. Not present on hipped roofs. Measured along the slope.
  • Joint cover - A clip-on strip that covers the join between two board lengths. Required wherever two boards meet end-to-end.

Material Guide

  • uPVC - By far the most common choice for residential. Zero maintenance, no painting, rot-proof. Standard 5 m lengths. Available in white, cream, and woodgrain foils. Typically 18-25 mm thick.
  • Painted timber - Traditional appearance. Requires painting every 5-7 years. Typically 25 mm ex softwood. Better thermal performance than uPVC.
  • Aluminium - Powder coated in any RAL colour. More rigid than uPVC, longer lengths available. Popular on contemporary and commercial projects.
  • Composite - Cellulose and PVC composite. More rigid and stable than uPVC, often used to replicate timber appearance. Lengths typically 3.6-5 m.

Measuring Tips

  • Measure each elevation separately - front, rear, left side, right side
  • For gable ends, measure the sloping length of the barge board, not the wall height
  • Soffit width: measure from the outside face of the wall to the back of the fascia position
  • If the soffit is wider than one board, the calculator accounts for this automatically using the board width you enter
  • Add an external corner piece wherever two fascia runs meet at an outside corner of the building
  • Allow one joint cover wherever two board lengths butt together - the calculator estimates these from board count

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