Tools
Free calculators and interactive tools from Professional Roofers.
Roof Replacement Cost Calculator (UK 2026): Estimate Your New Roof Price
Free UK roof replacement cost calculator: estimate the price of a new pitched roof by house type, roof area, material and region, including scaffolding and strip-out.
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Roof Area Calculator: Work Out Your Sloped Roof Size from the Ground (UK)
Free roof area calculator: enter your house length, width and roof pitch to get the true sloped roof area in m² for gable and hipped roofs, the number quotes and tile orders need.
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How Many Roof Tiles Do I Need? Roof Tile Calculator (UK)
Free roof tile calculator: enter your roof area and tile type to estimate how many roof tiles, battens and ridge tiles you need, with wastage included.
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Flat Roof Cost Calculator: Felt vs EPDM vs GRP Over 30 Years (UK)
Free flat roof cost calculator comparing felt, EPDM rubber and GRP fibreglass by upfront price and lifetime cost over the years you own the home, for UK homeowners.
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Gutter Size Calculator: What Size Guttering and Downpipes Do I Need? (UK)
Free UK gutter size calculator: enter your roof plan area, pitch and rainfall to find the gutter profile (half-round, deep or square) and number of downpipes you need before you buy.
Read guideRoof Pitch Calculator (UK): Find Your Roof Angle in Degrees
Free UK roof pitch calculator: work out your roof angle in degrees, ratio and percentage from the rise and run, or from the rafter length, with guidance on minimum pitch for each roof covering.
Read guideRoofing Underlay Calculator (UK): How Many Rolls of Membrane Do I Need?
Free UK roofing underlay calculator: work out how many rolls of breathable membrane (or felt) you need from your roof dimensions or area, with head laps, end laps and wastage included.
Read guideRoof Batten Calculator: Gauge and Metres of Tiling Batten
Free UK roof batten calculator. Enter your tile or slate length and headlap to get the batten gauge, number of batten rows, and total metres of tiling batten to order.
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