How to use the pad / spread footing calculator
This calculator helps you calculate concrete quantities for one or more rectangular pad foundations. It is intended for quantity takeoffs, early budgets and checks against a measured schedule. Start with the dimensions or quantities for one clearly defined item of work. Enter values in the units shown beside each field; millimetres and metres are not interchangeable.
Measures rectangular pads of uniform depth. Blinding, pedestals, excavation and sloping faces are separate items. Use dimensions from an approved design.
Worked example
Four pads measuring 1.5 m × 1.5 m × 0.5 m contain 4.5 m³ in total.
Before you order
Compare the result with your drawings and supplier information. Keep the original net quantity separate from allowances, and round purchasing quantities only at the ordering stage. Check whether delivery, labour and related materials belong elsewhere in your estimate. If the drawing or specification changes, update the inputs and record the revised basis instead of reusing an earlier total.
For the concepts behind this calculation, read Takeoff (Quantity Takeoff), Measured Works, Concrete Grade.