Yard & Concrete Calculators
Concrete, gravel, mulch, topsoil and fence calculators for outdoor projects. Every tool shows its formula and sources, and works in imperial or metric.
Calculators
Concrete Calculator
Slabs, round columns and steps: cubic yards, m³ and 40–80 lb or 25/30 kg bags.
Gravel, Mulch & Topsoil Calculator
Bulk volume, approximate weight and bag counts for gravel, sand, topsoil and mulch.
Fence Calculator
Posts, rails, pickets and bags of concrete per post for one or several fence runs.
Guides
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.
GuideHow 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.
GuideHow 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.
GuideHow 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.