Fascia Board Calculator — Boards, Trims & Fixings
Calculate fascia boards needed for your roof perimeter. Includes corner trims, joining pieces and fixing screws.
Total eaves perimeter of the roof
200mm is most common
Typical house: 4 corners
How We Calculate This
This calculator divides your total roof perimeter by the fascia board length to determine how many boards you need. It then calculates corner trims, joining pieces and fixings.
The formula
Boards needed = Roof perimeter ÷ Board length (rounded up)
Frequently Asked Questions
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Last updated: March 2026
All calculations are estimates. Verify with your supplier.