Free Roofing Calculators That Actually Work
Get instant, accurate answers on roof pitch, area, slope angle, slates and tiles, and replacement cost. No signup, no email — just numbers. Built for UK homeowners and trades.
Most popular calculators
- Roof Pitch Calculator (UK)Free roof pitch calculator for UK projects. Convert between roof angle in degrees, rise/run ratio and rafter length. Get the slope factor for accurate area takeoffs to BS 5534.
- Roof Tile & Slate CalculatorFree roof tile and slate calculator for UK projects. Calculate the number of plain tiles, interlocking tiles, natural slates, ridge tiles and pallets needed in pieces per m².
- Roof Area Calculator (UK)Free roof area calculator for UK projects. Get on-slope area in m², tile and slate quantities, and underlay rolls based on footprint and pitch in degrees. BS 5534 compliant.
- Roof Truss Calculator (UK)Free UK roof truss calculator. Size trussed rafters, fink, attic and scissor trusses to BS 5268-3 and BS EN 14250. Member lengths, count and delivered cost in GBP.
- Loft Insulation CalculatorCalculate top-up depth, roll count and material cost for loft insulation. Approved Document L Volume 1 (2021) U-value targets, mineral wool, sheep's wool, blown cellulose.
- Gutter Installation Cost CalculatorEstimate 2026 UK guttering installation pricing per linear metre by profile, material, building height, and access. Itemised labour, materials, downpipes, leaf guards, and removal line items in pounds.
- Gutter Slope CalculatorCalculate gutter fall, gradient and per-metre drop using BS EN 12056-3 minimum 1:600 or a custom 1:N gradient. Single-fall and centre-high split layouts with chalk-line drop table.
- Roof Area Calculator (UK)Free UK roof area calculator. Compute the actual roof surface in square metres for gable, hip, mono-pitch and L-shape roofs from footprint, pitch in degrees, and eaves overhang.
- Roof Cost Calculator (UK)Estimate the full installed cost of a roof replacement in the UK in 2026: concrete tile, clay tile, natural slate, felt, and metal — itemised by material, labour, strip-off, skip hire, and Building Regs.