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Free trade & DIY calculators: paint, tile, sealant, concrete, cable, fixings & pool. From Securadeal, SA's tools store. Free trade & DIY calculators for South African homeowners, tradespeople and DIYers — from Securadeal. Work out exactly what you need before you buy: - Paint — wall area to litres (2 coats) - Tile adhesive — area to 20kg bags - Waterproofing — coverage over 2-3 coats - Silicone sealant — bath / basin / kitchen joints to 300ml tubes - Concrete — 1:2:4 mix (cement, sand, stone) - Cable & breaker — recommended size by circuit - Fixings & anchors — the right plug for the job - Pool chlorine — HTH dosing by pool volume - Coffee brew ratio — because why not Switch any measurement between mm, cm and m — results update instantly as you type. Every estimate links straight to the matching range at securadeal.co.za, South Africa's online store for tools, hardware, safety gear and building supplies. No sign-up. No permissions. No data collected — it just works. Also free on the web: https://www.securadeal.co.za/calculators/