Calculator Collections

Calculators grouped by project type. Pick your project and find every tool you need in one place.

Building an Extension

Every calculator you need for a house extension — foundations, structural, roofing, insulation and finishing.

Calculators for converting your loft — boarding, insulation, ventilation, structural and finishing trades.

Everything for a bathroom refit — tiling, plumbing, extraction, waterproofing and flooring.