Free Online Construction & Trades
5 free browser-based construction & trades — no sign-up, no server uploads, all processing happens in your browser.
Concrete Calculator
Calculate concrete volume in cubic metres for slabs, footings, columns and stairs. Includes wastage allowance and pre-mix bag estimates. Free online concrete calculator
Brick Calculator
Calculate bricks per square metre with mortar joints and wastage allowance. Supports standard Australian brick sizes and bond patterns. Free online brick calculator
Roof Pitch Calculator
Calculate roof pitch in degrees, rise and run, rafter length and roof area multiplier. Convert between angle, ratio and percentage. Free online roof pitch calculator
Electrical Cable Size Calculator
Calculate minimum cable size for voltage drop compliance per AS/NZS 3008. Single and three phase, copper and aluminium. Free online cable size calculator
Paint Coverage Calculator
Calculate how much paint you need in litres for walls and ceilings. Room mode with door and window deductions, multiple coat types. Free online paint calculator