Fascia Calculator
Fascia boards from the roof's edges: eave and rake lengths into total linear feet, and boards in the stock length you buy, with the waste allowance in.
Fascia follows the roof's outline
Fascia is the board the roof's edge wears: it runs every eave (where the gutters hang) and climbs every rake (the sloped edges of the gable ends). So the count is the outline added up — total eave length plus total rake length — turned into boards of the length your yard stocks. The cuts live at corners and ridge peaks, where miters eat into stock, which is what the waste allowance covers.
Fascia length = eave length + rake length · Boards = length (with allowance) ÷ stock board length, rounded up
Example: a house with 80 ft of eaves and 64 ft of rakes needs 144 ft of fascia — in 12 ft boards with the allowance, 14 boards.
Measuring the rakes from the ground: a rake's length is the slope length of one gable side — the roofing calculator's slope factor applied to half the gable's width gives it, if a ladder is not in your plans. Board depth matches the rafter tails it covers: 2 × 6 or 1 × 8 fascia is the common residential pick, deeper where the rafter tails are deep. Metal fascia cover (the pre-bent aluminum that wraps wooden fascia on vinyl and aluminum jobs) is sold in 10 and 12 ft pieces and counts the same way. And since the fascia is the gutter's backbone, rot here is a gutter problem wearing a disguise — sound fascia, screwed gutters: the gutter calculator counts that hardware.
Frequently asked questions
What is the difference between fascia and soffit?
Fascia is the vertical board at the roof's edge — it caps the rafter ends and carries the gutters. Soffit is the horizontal panel underneath the overhang, closing the space between the fascia and the wall. Fascia is counted in linear boards; soffit is an area (and often the attic's intake venting lives in it).
What size fascia board do I need?
Deep enough to cover the rafter tails fully — 2 × 6 is the common default, 2 × 8 or 1 × 8 where tails are deeper (steep pitches cut on the plumb show more board). Too shallow leaves the tail ends peeking below the board and the drip edge with nothing to land on.
Wood, PVC or aluminum-wrapped fascia?
Painted wood is the traditional board and the first to rot where gutters overflow. PVC and fiber-cement boards shrug off water at a higher price; aluminum cover over wood is the vinyl-siding era's compromise. In wet climates the rot-proof options repay themselves the first time a gutter seam leaks unnoticed for a season.
How do I measure rakes without climbing?
From the plans or the ground: half the gable's width, stretched by the slope factor for your pitch (at 6/12, ×1.118; the roof pitch calculator gives the factor for any pitch), times two sides per gable. Add the two gables' worth together and that is your rake total for the calculator.
CalcCoverage