Roof Area Calculator
Calculate measured roof-section area. For slopes, measure the surface or apply a separate pitch calculation before ordering materials.
Calculadora de precisión
Roof Area Calculator
Roof Area Calculator: Calculate a roof section area from measured dimensions. For pitched roofs, measure the actual roof surface or
Área Conocida
Dimensiones de la habitación
Varias Habitaciones
Habitación (Pies + Pulgadas)
ft
in
ft
in
Rectángulo (Pies + Pulgadas)
ft
in
ft
in
Dimensiones de paredes y ventanas
Dimensiones de la pared de la catedral
Square Dimensions
Rectangle Dimensions
Borde rectangular
Circle Dimensions
Circle Border (Annulus)
Annulus Dimensions
Triangle (3 Sides)
Triangle (Base & Height)
trapezoide
Polígono Regular
Área + Profundidad (Volumen)
Factor de desperdicio de materialesOPCIONAL
%
Estimar el costo del materialOPCIONAL
Calculation Results
Explore nuestras calculadoras de pies cuadrados
Elija una calculadora especializada para su proyecto exacto: habitaciones, formas, materiales, áreas exteriores y conversiones de unidades.
Calculadora de habitaciones → Calculadora de casa → Calculadora de dormitorio → Calculadora de baño → Calculadora de cocina → Multiple Rooms → Calculadora rectangular → Calculadora de Triángulos → Calculadora de círculos → Calculadora de trapezoide → Regular Polygon Calculator → Forma irregular → Odd Shape → Uneven Sides → Calculadora de pisos → Calculadora de azulejos → Calculadora de pintura → Calculadora de Concreto → Calculadora de aislamiento → Calculadora de césped → Calculadora de yardas → Calculadora de paisajismo → Calculadora de piscina → Calculadora de garaje → Calculadora de techo → Calculadora de pared → Feet & Inches → Calculadora de pulgadas → Height Width Length → Pies cuadrados a Acres → Cubic Yards Calculator →
Cómo funciona
1
Seleccionar forma
Choose the shape that matches your space.
2
Introducir dimensiones
Introduzca medidas en cualquier unidad. Agregue cantidad, factor de desperdicio y precio del material.
3
Obtener resultados
Vea el área en pies², pulgadas², yd², m², acres más una estimación de costos, todo a la vez.
Preguntas frecuentes
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.