Concrete Pour and Mix

These calculators work out how much concrete a pour needs. Pick the shape (slab, footing, steps or tube), or work from bags, a mix ratio or a weight. Each gives the volume or the number of bags to order.

Tools in this group

• Cement Mix Calculator (Cement, Sand and Aggregate) — Choose a mix ratio and the volume you need to get the cement sacks, sand, gravel and water to batch it on site.
• Concrete Bags Calculator — Type the size of the pour or its volume and see how many bags of premixed concrete each bag size needs.
• Concrete Slab Calculator — Enter the slab's length, width and thickness (or its area) to get the concrete volume, bags, a thickened edge and the gravel base.
• Concrete Step Calculator — Enter the number of steps, rise, tread depth and width to get the concrete for the whole flight, with a side view.
• Concrete Weight Calculator — Enter a volume or the dimensions and the concrete type to get the weight in kg, tonnes, pounds and US tons.
• Sonotube Calculator (Concrete Cylinder) — Pick the tube diameter, height and number of tubes to get the concrete per tube and in total, in volume and bags.