Concrete calculators
Work out how much concrete a pour needs, in ready-mix yards or premixed bags, with waste included.
Concrete calculator
Cubic yards and 40, 60 or 80 lb bags for a slab, footing, post holes or steps, with waste and the ready-mix order.
Concrete block calculator
Blocks or bricks for a wall, with mortar bags, core grout and courses, net of doors and windows.
Planning a pour
- Measure the forms, not the plan. Formwork rarely ends up exactly on the drawing, and an inch of extra thickness over a slab adds up fast.
- Add waste. 5 to 10% for spillage, form bow and an uneven base. Running short mid-pour leaves a cold joint.
- Choose bags or ready-mix. A cubic yard is 45 bags of 80 lb. Past about a yard, ready-mix is usually the better choice.