形狀
間距
Overhangs
Roof Area Calculator (Pitch-aware)
Calculate sloped area from plan dimensions and pitch. Split complex roofs into sections and sum them.
Inputs are horizontal (plan) lengths, not rafter length.
計算假設
- Dimensions are plan (horizontal) lengths, not rafter lengths.
- Overhangs are treated as horizontal projections.
- Hip, gable/hip mixes, valleys, dormers, etc. should be handled by sectioning.
單位
Unit is fixed on the right of each input.
Roof section
Drag to reorder
Formulas
- r = Rise/Run
- θ = atan(r)
- k = 1 / cos(θ) = sqrt(1 + r^2)
- Shed: Ap = (L + 2g) × (D + e + e2)
- Gable: Ap = (L + 2g) × (S + 2e)
- Sloped area: As = Ap × k
注意事項
- 本工具僅為計算輔助，不能替代專業設計、規範、合同或安全要求。
- 預設值為範例，會隨實際條件變動。
常見問題
What if the gable left/right spans differ?
Use the advanced option to enter left and right half spans.
How do I enter sun pitch?
You can enter 3.5 or 3 sun 5 bu.
Are inputs rafter lengths?
No. Inputs are plan (horizontal) lengths.