Insulation Volume Calculator – Walls, Floors & Roofs

Plan your insulation project with precision. This free calculator estimates the amount of insulation you’ll need for walls, floors, and roofs. It’s based on UK-standard pack sizes, includes wastage allowances, and checks your design against UK Building Regulations U-values. Works with rolls, batts, and rigid boards, and supports both metric (m²) and imperial (ft²) units.