Free Roofing Calculators That Actually Work

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.

Estimate 2026 UK roof repair cost by scope, covering, age, height, access, permits and skip hire — itemised from single slate replacement through structural decking work.

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.

Estimate UK 2026 polycarbonate conservatory, lean-to and carport roof cost (corrugated, solid, twin-wall, multi-wall 16/25 mm) by area, sheet type, tint, glazing-bar length and storey. Modelled around Marlon ST Longlife, Palram Suntuf, Brett Martin Marlon multi-wall and Corotherm products.

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 UK 2026 chimney repair cost by line item: flaunching renewal, repointing, brick replacement, above-roof rebuild, pot capping, flue liner, water-repellent seal, damper. To BS 5440 / HETAS guidance with 2026 UK trade rates.

Estimate 2026 UK EPDM rubber-membrane roof cost by line item: 1.14/1.52/2.29 mm black or white EPDM, mechanically fixed, fully bonded, ballasted or self-adhered. Real 2026 NFRC, SPRA and BBA contractor rates per BS 6229 and Approved Doc L1B.