Concrete Steps Calculator

How do you calculate concrete for steps?

Solid steps on the ground are a stack of blocks. The bottom step is one rise tall, the second is two rises tall, and so on, because each step sits on solid concrete all the way down. Add them up, then add the top landing.

Volume (ft³) = width × run × rise × (1 + 2 + … + number of steps) + width × landing depth × total rise

In the calculator each field has its own unit menu (in, ft, yd, cm or m). Rise, run and landing start in inches and width in feet, and it converts for you. To do it by hand, convert inches to feet by dividing by 12, then divide the cubic feet by 27 for cubic yards.

1. Count the steps that are separate from the landing. The landing is the top platform at door level.
2. Measure rise (height) and run (tread depth) of one step. Keep every step the same.
3. Measure the width of the stairs and the depth of the landing from the door.
4. Add the calculator’s default 10% planning allowance for form bulges and spillage (ask your supplier what they recommend).

The shortcut 1 + 2 + … + n equals n × (n + 1) ÷ 2, so 3 steps count as 6 step-blocks, 4 steps as 10 and 5 steps as 15. That is why volume climbs much faster than the number of steps: 5 steps hold 2.5 times the concrete of 3 steps.

How much concrete for 1 to 5 steps?

The table assumes a 7 in rise and an 11 in run, the defaults in the calculator. It shows each flight with no landing and with a 36 in deep landing.

Bag counts have no waste allowance; add 10%. Notice how fast the landing adds up: on a 3-step, 4 ft flight it is 21 of the 33.83 ft³.

Other rise and run combinations

Rise and run change the volume less than the landing does, but they still matter on longer flights. All rows are 4 ft wide.

How big is the landing, and how much does it add?

The landing is a solid block as tall as the whole flight, so it is often the largest part of the pour. For 3 steps 4 ft wide at 7 × 11 in (21 in total rise):

Each extra foot of landing depth adds 7 ft³ here (4 ft wide × 1.75 ft high). Size the landing from your plans and local code; the door swing and any handrail often decide it.

A front stoop with no separate steps is just the landing on its own: width × depth × height. A 5 × 4 ft stoop 21 in high is 35 ft³, or 1.30 yd³ (59 × 80 lb bags, 65 with extra).

How many steps for your total rise?

Total rise is the height from the finished ground (or walkway) to the top of the landing, usually just below the door threshold. Divide it by your target rise and round up to a whole number of steps; then divide the total rise by that number to get the actual rise for each step.

When the division does not come out even, the rise per step changes, and so does the concrete. A 30 in rise as 5 steps of 6 in uses more concrete than 4 steps of 7½ in, because the extra step adds another full tread. Run both options in the calculator before you build forms.

What size should concrete steps be?

The most important rule is consistency: every rise and every run in a flight should match, because uneven steps are a trip hazard. Your local building code sets the maximum rise and minimum run, so take the numbers from your code or plans. The calculator defaults of 7 in × 11 in are only a starting point.

• Total rise decides the step count, as shown above.
• Landing. Many entry doors need a landing in front of them. Size it to your plans.
• Width. Match the door and walkway; 4 ft is the calculator default. Volume rises in direct proportion: 3 steps with a 36 in landing need 0.94 yd³ at 3 ft wide, 1.25 yd³ at 4 ft, 1.57 yd³ at 5 ft, 1.88 yd³ at 6 ft and 2.51 yd³ at 8 ft.
• Codes vary. Rise, run, landing size and handrails for entry steps are set by your local building code, so check before you build forms.

Metric concrete steps

In metric units the method is the same. Three steps 1.2 m wide with an 18 cm rise and 28 cm tread need 0.36 m³ on their own. Add a 0.9 m deep landing and the total is 0.95 m³, which weighs about 2,270 kg wet and equals about 56 bags of 80 lb concrete. Switch the calculator to Metric to enter centimetres and metres, and round the order up to your supplier’s increment.

How much do concrete steps weigh?

At about 150 lb/ft³, solid steps are far heavier than they look. Three steps 4 ft wide at 7 × 11 in weigh about 1,925 lb on their own and about 5,075 lb with a 36 in landing. Five steps with the same landing weigh about 10,060 lb. Two practical consequences follow:

• Get the position right before the pour. Once cured, a flight this heavy cannot be nudged into line with the door; removing it means breaking it out.
• The ground has to carry it. A heavy block of steps on soft, uncompacted fill will settle away from the house. Compact the base, and use footings where your plans call for them.

Forming steps so the estimate holds

Step forms bulge more than slab forms because the concrete is deeper and pushes harder on the boards. A side board that bows out ½ in along a 21 in high landing adds concrete you did not count.

1. Brace the side forms every couple of feet with stakes and kickers so they cannot spread.
2. Bevel the bottom edge of each riser board so the finisher can reach the tread surface beneath it.
3. Fix the riser boards to cleats at each end rather than relying on nails into the side forms alone.
4. Check every rise with a level and tape before the pour. A riser set ½ in high changes the landing height and the door clearance.
5. Fill from the bottom step up, and tap the forms to release trapped air.

The calculator’s volume assumes perfectly straight forms, and its 10% waste setting is a planning allowance for small form bulges and spillage, not a measured figure. On very tall or wide flights, brace the forms more rather than relying on extra concrete, and ask your supplier how much extra to order.

Steps onto an existing slab or walkway

When steps sit on an existing concrete walkway or patio, the bottom step starts at the slab surface, so measure total rise from the slab, not from the soil. If the walkway is being poured at the same time, calculate it with the concrete slab calculator and add the two with Add to project. A 4 ft wide, 10 ft long walkway at 4 in adds 0.49 yd³.

Steps that drop from a raised patio into a yard have no landing of their own; the patio is the landing. Enter a landing depth of 0 and the calculator gives the steps only.

Bags or ready-mix for steps?

Small flights are a bag job; anything with a big landing usually is not. Under about ½ yd³ (around 23 × 80 lb bags), bags and a rented mixer are practical. A 3-step flight with a landing is 1.25 yd³, or 57 bags and about 4,600 lb of dry mix, so compare that with a small ready-mix delivery. Ask your plant about minimum loads and short-load charges.

Bagged concrete such as QUIKRETE Concrete Mix lists steps among its uses and is rated for pours 2 in thick or more. Use the yield on the bag you buy; an 80 lb bag makes about 0.60 ft³ and a 60 lb bag about 0.45 ft³, so the same 3-step flight with a landing takes 76 × 60 lb bags.

Steps are also slow to place. Each tread is finished separately and the forms need time to be filled from the bottom up, so a crew mixing bags by hand must keep up with the finisher. If you go with bags, have the mixer, water and all the bags on site before you start.

How to estimate the cost of concrete steps

There is no reliable national price for steps, because concrete, forms and labor vary by area. Build your own estimate from the volume:

Material cost = cubic yards ordered × your price per yard, or bags × your price per bag

For the 3-step flight with a 36 in landing that means 1½ yd³ of ready-mix, or 63 × 80 lb bags with 10% extra. Add form lumber, stakes, rebar or mesh, any delivery or short-load charge, and labor quotes. Enter your local price per yard in the calculator for the material cost, and see concrete price per yard for what drives that price. For a full estimate with labor, demolition and repair options, use the concrete steps cost calculator.

Do concrete steps need footings or rebar?

Often, yes, but it depends on where you live and how the steps attach to the house. Steps tied to a house foundation in a cold climate usually need footings below the frost line so they do not heave apart from the house. Reinforcement and anchoring to the foundation are also common. Follow your plans and local code.

• Calculate footings separately with the footing calculator and use Add to project to total them with the steps. Two round piers 12 in across and 36 in deep, for example, add 4.71 ft³ (8 × 80 lb bags).
• Size reinforcement with the rebar calculator.
• Steps that span between supports, rather than resting on solid ground, are structural and should be designed by a professional.

Ways to use less concrete on big steps

The calculator gives the solid volume, which is the safe number for small steps. On tall flights and large landings, many builders fill the core with compacted gravel or clean broken concrete and pour a shell several inches thick over it. Estimate the fill as a block and subtract it from the total, but keep the shell thickness your plans specify.

Cinder block steps: blocks, fill and cap

Cinder block steps are built as stacked rings of concrete block, one course per step, filled with compacted gravel and topped with a poured concrete cap. You buy blocks for the walls, fill for the core and concrete only for the cap, so the concrete order is far smaller than for solid steps.

To count blocks, each course is a U of block: the front wall across the full width plus two side walls back to the house. With 8 × 8 × 16 in blocks (actual 7⅝ × 7⅝ × 15⅝ in, laid at 16 in per block with the mortar joint), the side walls are the course depth minus the 8 in front block. Course 1 runs under every tread; each course above is one tread shorter.

At 5 ft wide the same three steps take 17.25 blocks (buy 19) and a 5 ft³ cap (9 × 80 lb bags, 10 with extra); two steps 4 ft wide take 8.5 blocks (buy 9). Each riser is one block course plus the cap, so check that height against the step rules in your local code before you build; the concrete block calculator handles taller block walls and mortar.

Common mistakes when estimating concrete steps

1. Leaving out the landing. On 3 steps 4 ft wide the 36 in landing is 21 ft³, more than the steps themselves (12.83 ft³).
2. Counting only the treads. Treating each step as a 4 in slab gives 3.67 ft³ for a 3-step flight; the solid steps need 12.83 ft³, three and a half times more.
3. Rounding the rise up by an inch. Building 3 steps with an 8 in rise instead of 7 in, with the same landing, takes 38.67 ft³ instead of 33.83 ft³, and makes the top step miss the door threshold.
4. Using the total rise as the step count. Count steps from total rise ÷ target rise, rounded up. A 30 in rise is 4 or 5 steps, not 4.3.
5. Forgetting footings and piers. Two 12 in piers 36 in deep add 4.71 ft³, 8 more bags.
6. Ordering without waste. Forms can bulge and concrete spills. With the calculator’s default 10% planning allowance, 57 bags becomes 63; ask your supplier what they recommend.

Steps calculator vs other calculators: which one to use

• This steps calculator: poured stairs and landings, where each step is a different height.
• Concrete slab calculator: a flat walkway or patio at the bottom of the steps.
• Concrete footing calculator: footings and frost walls under the steps.
• Concrete bag calculator: bag counts for any volume in 40, 50, 60, 80 or 90 lb bags.