Roof Area Calculator
Calculate measured roof-section area. For slopes, measure the surface or apply a separate pitch calculation before ordering materials.
Kalkulator Ketepatan
Roof Area Calculator
Roof Area Calculator: Calculate a roof section area from measured dimensions. For pitched roofs, measure the actual roof surface or
Kawasan Terkenal
Dimensi Bilik
Beberapa Bilik
Bilik (Kaki + Inci)
ft
in
ft
in
Segi Empat Tepat (Kaki + Inci)
ft
in
ft
in
Dimensi Dinding & Tingkap
Dimensi Dinding Katedral
Square Dimensions
Rectangle Dimensions
Sempadan Segi Empat
Circle Dimensions
Circle Border (Annulus)
Annulus Dimensions
Triangle (3 Sides)
Triangle (Base & Height)
Trapezoid
Poligon Sekata
Kawasan + Kedalaman (Isipadu)
Faktor Sisa BahanPILIHAN
%
Anggarkan Kos BahanPILIHAN
Calculation Results
Terokai Kalkulator Footage Persegi Kami
Pilih kalkulator khusus untuk projek tepat anda — bilik, bentuk, bahan, kawasan luar dan penukaran unit.
Kalkulator Bilik → Kalkulator Rumah → Kalkulator Bilik Tidur → Kalkulator Bilik Mandi → Kalkulator Dapur → Multiple Rooms → Kalkulator Segi Empat → Kalkulator Segi Tiga → Kalkulator Bulatan → Kalkulator Trapezoid → Regular Polygon Calculator → Bentuk Tidak Sekata → Odd Shape → Uneven Sides → Kalkulator Lantai → Kalkulator Jubin → Kalkulator Cat → Kalkulator Konkrit → Kalkulator Penebat → Kalkulator Rumput → Kalkulator Yard → Kalkulator Landskap → Kalkulator Kolam → Kalkulator Garaj → Kalkulator Bumbung → Kalkulator Dinding → Feet & Inches → Kalkulator Inci → Height Width Length → Kaki Persegi kepada Ekar → Cubic Yards Calculator →
Bagaimana Ia Berfungsi
1
Pilih Bentuk
Choose the shape that matches your space.
2
Masukkan Dimensi
Pengukuran input dalam mana-mana unit. Tambah kuantiti, faktor sisa, dan harga bahan.
3
Dapatkan Keputusan
Lihat kawasan dalam kaki², dalam², yd², m², ekar serta anggaran kos — semuanya sekali gus.
Soalan Lazim
How do I calculate the square footage of a roof?
On a simple gable roof, measure base length and width, then multiply by a slope factor: 1.054 for 4/12 pitch, 1.118 for 6/12, 1.202 for 8/12. Or measure the roof surface directly if you can reach it safely.
What is a "roofing square" and how does it relate to square feet?
One roofing square is 100 sq ft. Shingles and underlayment are sold by the square. Divide roof area by 100 for squares needed. Add 10 to 15% for ridges, valleys, and cuts.
How do I measure roof area from the ground?
Measure the building footprint (length × width) and multiply by a pitch factor for your slope. Satellite tools and roof measurement apps help too. Complex roofs with dormers need each section measured separately.
What waste factor should I use for roofing?
Use 10% for simple gable roofs. Use 15% for hip roofs, dormers, or valleys. Use 15 to 20% for complex roofs with skylights and penetrations. Steep roofs waste more because cuts are harder.
How do I calculate ceiling area vs. roof area?
Ceiling area is flat: room length × width below. Roof area includes slope, so it is larger. A vaulted or cathedral ceiling matches roof area for that section. Flat ceilings match floor area.