Concrete · updated 2026
Concrete Steps Calculator
Concrete steps are just stacked triangles — each step's volume is half of rise × run × width, times the number of steps. This concrete steps calculator takes your rise, run, width, and step count and returns cubic feet, cubic yards, and exact 80-lb bag counts, with 2026 costs. It assumes solid poured steps (the normal DIY case); if you're forming hollow steps over fill, you're overestimating slightly, which beats running short mid-pour.
Code max is 7.75 in; 7 in is the comfortable standard
Code min tread is 10 in; 11–12 in feels natural
Show the math
Volume per step = (7 × 11 ÷ 2) × 48 = 1848.0 cu in ÷ 1728 = 1.07 cu ft
Total = 1.07 × 4 steps = 4.28 cu ft
Cubic yards = 4.28 ÷ 27 = 0.16 yd³
80-lb bags = 4.28 ÷ 0.6 cu ft/bag = 8 (rounded up)
What the numbers mean
The calculator converts your measurements into a practical purchase quantity using a documented coverage or spacing assumption.
Any whole-unit quantity is rounded up so the result does not leave you short during the project.
Use the cost range as a planning baseline and confirm the final quantity, availability, and delivery charge with your local supplier.
2026 material prices
| Material | 2026 average price | Note |
|---|---|---|
| 80-lb concrete mix bag | $6.47 – $7.58 / bag | Yields 0.6 cu ft |
| 60-lb concrete mix bag | $5.00 – $6.00 / bag | Yields 0.45 cu ft |
| 2×8 form lumber | $8.00 – $12.00 / 8-ft board | Per 8-ft board |
Material prices: Wave 1 Batch 2 2026 national-average guide, Sep 2026. Local prices vary. 2026 U.S. national averages. Prices vary by region and retailer — confirm locally before buying.
Pro tips
- Steps almost never justify a ready-mix truck — even 5 big steps are under a third of a yard, firmly in bag territory.
- Keep every riser identical; a ¼-in variation between steps is a trip hazard and a code violation.
- Form the steps upside-down (treads as the form bottom) only if you’re experienced — most DIYers form each riser board in place.
- Vibrate or rod each step to kill air pockets against the riser boards — honeycombing on a riser face is forever.
- Pour on a cool morning; steps have huge exposed surface area and hot sun will flash-set the top before you finish.
- Four 7×11×48-in steps need 8 eighty-lb bags — one car trunk load, but at 80 lbs each, plan two trips or a helper.
Common questions
Frequently asked questions
How much concrete for 4 steps (7-in rise, 11-in run, 48-in wide)?
4.3 cu ft ≈ 0.16 cubic yards — 8 eighty-lb bags.
How many bags for 3 steps the same size?
3.2 cu ft ÷ 0.6 = 5.4 → 6 eighty-lb bags.
How about 5 bigger steps (7.5-in rise, 12-in run, 60-in wide)?
7.8 cu ft ≈ 0.29 yards — 14 eighty-lb bags (or 18 sixty-lb bags).
Should I order ready-mix for steps?
No — steps rarely exceed half a yard; bags are cheaper once you add the truck's short-load fee.
What rise and run does code allow?
Max 7.75-in riser, min 10-in tread (IRC) — and all risers in a flight must match within ⅜ in.
How many 60-lb bags instead?
Divide cubic feet by 0.45 instead of 0.6 — the 4-step example takes 10 sixty-lb bags.
Related calculators
Planning estimates only. Prices are 2026 U.S. national averages and vary by region — confirm with your local supplier before buying.