Concrete Steps Calculator

Pouring a staircase means buying the right amount of concrete, and getting the volume right is what keeps you from wasting material or coming up short. The calculator reports the volume in cubic feet and cubic yards and converts it to 80-lb bags at 0.6 cubic feet each, the yield QUIKRETE lists for its 80-lb Concrete Mix, priced at the bag cost you enter ($6 by default).

The volume here is built up step by step. Solid steps are poured as one stepped block, so the bottom step is one riser tall, the second two risers tall and so on. The math comes out to Step Rise × Step Run × Step Width × (1 + 2 + … + Number of Steps), which for n steps is n(n+1)/2 rise-by-run blocks: 10 blocks for 4 steps, 15 for 5. The calculator assumes the steps are solid to the ground and has no landing input; if your design includes a landing or a base slab, work out its volume (length × width × thickness) separately and add it.

Forms spill, edges slump, and complex shapes never come out exactly as drawn, so pad your figure by an extra 5 to 10% before you place the order. The thickness of the base or landing is the part most people leave out, and skipping it is exactly what leads to ordering too little. One more thing worth checking: keep every measurement in the same unit, either all inches or all feet, since mixing them is the fastest way to throw off the final number.