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Calculators

Real measurements, visible formulas and purchase-ready quantities.

Paint & primer calculator

Measure walls and ceiling, subtract doors and windows, then add coats and waste. The result rounds up to full containers.

Calculate surface area, extra waste, individual tiles and full boxes. Metric and imperial dimensions stay physically equivalent.

Estimate strips and full rolls using room perimeter, roll size, trimming, pattern repeat and a waste allowance.

Turn a room into packs of laminate or vinyl, rolls of underlay and lengths of skirting. Waste follows the laying pattern, not the room size.

Beds and lawns are sold by volume and by sowing rate, not by area. Get bags, cubic metres and seed weight from one measurement.

Slabs, strip footings and columns, in cubic metres or cubic yards, with the bag count and the point where ready-mix takes over.