All Roofing Calculators

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.

Free 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.

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.

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.

Calculate 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.

Estimate 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.

Calculate 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.

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.

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.

Estimate 2026 UK roof leak repair pricing in pounds — slipped tiles, lead flashing, valley fixes, chimney work — with itemised labour, materials, and emergency call-out fees.

Size stick-built common rafters to BS 5268-7.5 / EN 1995-1-1 with snow load, count and 2026 timber prices in pounds. CLS C16/C24 catalogue.

Size loft ventilation per BS 5250 and Approved Document C — eaves intake, ridge or gable exhaust, with vent counts in cm² free area.

Compare 2026 UK roofing costs across slate, tile, metal, asphalt and membrane on the same job. Side-by-side installed cost in £, £/m², service life and cost-per-year for British homes.

Estimate 2026 loft-insulation cost in GBP: material, labour and total installed price for blown cellulose, glass-wool roll, mineral-wool slab and stone-wool. Approved Document L 2021 targets.

Estimate 2026 UK gutter cleaning prices in pounds sterling by linear metre, storey count, debris level, and access. Itemised call-out floor, downpipe flush, leaf-guard refit, repair, and waste-removal lines.

Calculate roof snow load to BS EN 1991-1-3 UK National Annex. Returns characteristic snow load on the ground (sk), shape coefficient (μ1), exposure (Ce) and thermal (Ct) factors, and design roof snow load (s).

Estimate the full cost to replace a flat roof in the UK in 2026: EPDM rubber, GRP fibreglass, single-ply TPO/PVC, or felt — with strip-off, insulation, parapet flashings, and rainwater outlets itemised in pounds.

Calculate the right gutter size for a UK roof from area, pitch and design rainfall using BS EN 12056-3 NA hydraulic capacities. Half-round, ogee, deepflow and square profiles.

Free hip roof calculator for the UK. Compute surface area in m², common and hip rafter lengths, and ridge length for any equal-pitch four-sided hipped roof.

Estimate metal roof sheet count, flashing lengths, and installed cost in GBP. Standing-seam, box-profile, corrugated, and tile-effect metal — sized to BS 5534 and Approved Document C.

Calculate metal roof cost in GBP across standing-seam, profiled steel, aluminium, zinc, and copper. Low/mid/high quote ranges with NFRC 2026 contractor data, BS 5534 compliant.

Free roof estimate calculator for the UK. Build a contractor-style quote with line-item costs, overheads, profit, contingency and 20% VAT — plus a good/better/best 3-tier offer and 30/40/30 stage payments.

Get a 2026 UK roof replacement cost band by tile type, region, pitch, complexity and storeys — with home insurance scenario and monthly finance payment in GBP.

Free roofing square calculator for UK roofers. Convert m² into roofing squares (1 square = 9.29 m²), then estimate tile bundles, underlay rolls, eaves trim, and fixings to BS 5534. Waste allowance built in.

Work out the rise of a mono-pitch (lean-to) roof from span and pitch in degrees. Returns rafter length, slope factor, and surface-area multiplier to BS 5534 and Approved Document A.

Compare 2026 UK gutter prices across PVC, galvanised steel, cast aluminium, cast iron, zinc and copper on the same job. DIY material-only vs full installer cost, plus 30-year ownership cost projection per BS EN 12056-3.

Plan a complete UK roof replacement in 2026: strip, dispose, batten, breather membrane, scaffold, and full installed cost — broken down line by line in £/m².

Estimate 2026 UK gutter replacement pricing — strip-out of old guttering, fascia repair, new uPVC, aluminium, or cast iron systems, downpipes, drip trays. Per-metre line items.

Estimate roofing materials for a UK pitched roof in 2026: concrete or clay tiles, natural slate, battens, breather membrane, dry ridge and lead flashings — costed in GBP per m².

Size rainwater downpipes from roof area, pitch and rainfall using BS EN 12056-3 and BS 6367 methods — round and square profiles in cast iron, uPVC and aluminium.

Estimate the on-slope area of a gambrel (Dutch barn) roof in the UK. Two-pitch geometry, metric inputs, costed in GBP per m² with NFRC 2026 figures.