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Solid poured steps with an optional top landing. Enter the steps, rise, run and width, and get yards or bags.
ConCal takes the slab, footings, steel and labor from one drawing and turns them into a bid your customer can sign.
Think of solid steps as a stack of boxes. The bottom step is one rise tall, the next is two rises tall, and so on. Each one is a run deep and the full width wide. Add them up, then add the landing on top.
Steps (cu ft) = width × run × rise × n × (n + 1) ÷ 2
Landing (cu ft) = width × landing depth × (rise × n)
Work in feet: divide inches by 12. Then divide the total by 27 for cubic yards.
Worked example. Four steps, 7 inch rise, 11 inch run, 4 feet wide, with a 36 inch landing at the top. Steps: 4 × 0.917 × 0.583 × 4 × 5 ÷ 2 = 21.4 cubic feet. Landing: 4 × 3 × 2.33 = 28 cubic feet. Together that is 49.4 cubic feet, or 1.83 yards before waste. Notice the landing holds more concrete than the steps.
This assumes the steps are solid all the way to the ground. Many crews fill the middle with compacted gravel, or form the steps against an existing wall or slab. Either way you pour less, so take that out of the number.
Rise and run for steps people walk on are set by your local code. Check it before you set the forms.