Guides
How much material do you need?
One page per question, with the numbers already worked out for the common sizes. Every table is produced by the same formulas as the calculators, so you can open the tool and change any figure.
- How many bags of concrete for a 10x10 slab?Bags of 80, 60 and 40 lb concrete for a 10 x 10 ft slab at 4, 5 and 6 inches with 10% waste, plus the metric 3 x 3 m version in 25 kg and 20 kg bags.Concrete calculator
- How many bricks per square metre (and per square foot)?Bricks and blocks per square metre and per square foot for the common formats, how the mortar joint changes the count, and what to order for a 10 m² wall.Brick and block calculator
- How much paint do I need for a 12x12 room?Gallons of paint for a 12 x 12 ft room with 8, 9 or 10 ft ceilings, one or two coats, a door and two windows deducted, plus the 4 x 4 m room in litres.Paint calculator
- How many tiles per square metre? 30x30, 60x60 and other sizesTiles per square metre for the common sizes with a 3 mm grout gap, how many to order for 10 m² with cutting waste, and when to allow more than 10%.Tile calculator
- How much gravel do I need for a driveway?Cubic metres, tonnes and bulk bags of gravel for typical driveway sizes at 50, 75 and 100 mm depth, with the imperial equivalents in cubic yards and tons.Gravel calculator