Project Guides
Worked answers to the questions people ask before a trip to the store, with the math shown and sources linked.
How Many Bags of Concrete in a Yard?
Bags of concrete per cubic yard and per cubic metre for every common bag size, based on manufacturer yields, plus bag counts for common slab sizes.
Yard & ConcreteHow Much Concrete per Fence Post?
Bags of concrete per fence post for 4×4 and 6×6 posts at common hole sizes and depths, based on manufacturer guidance and bag yields, in imperial and metric.
Yard & ConcreteHow Much Gravel for a Shed Base?
Cubic yards and tons of gravel for 8×10, 10×12 and 12×16 shed bases at 4 in and 6 in deep, with and without a 1 ft border, and how to work out any size.
Yard & ConcreteHow Much Mulch Do I Need?
Mulch coverage per cubic yard and per bag at 1, 2 and 3 inches, how to measure beds and tree rings, and extension guidance on how deep to mulch.
Interior FinishingHow Much Paint for a 12×12 Room?
How many gallons of paint a 12×12 room needs for walls and ceiling with 8, 9 or 10 ft walls, one or two coats, plus the metric version in litres.
Interior FinishingHow to Calculate Square Footage for Odd-Shaped Rooms (and Square Metres)
How to measure square footage or square metres for L-shaped rooms, triangles, bay windows and curves, convert feet and inches, and avoid common mistakes.