Skip to calculator
MaterialCalc

—online—visits

MaterialCalc — Stair Tread & Riser Material Calculator

Estimate prepared 09/02/2026. Estimates only; verify against your plans before ordering.

Stair Tread & Riser Material Calculator

Finished floor to finished floor.

Each landing replaces a tread and needs its own nosing.

%

Treads are expensive to get wrong. Buy one spare.

Result

Loading…

There is always one fewer tread than riser — the top riser lands on the floor above, which is its own tread. Getting that wrong means one expensive oak board too many or, worse, one too few halfway through a Sunday. This counts treads, risers and nosing from your total rise.

Assumptions used

These are the numbers behind the result. Where one of them is soft, the cost range widens rather than pretending to a precision the data does not have.

Maximum stair riser
7.75 in

International Residential Code (2021) — Published product data, checked 09/01/2026

Minimum stair tread depth
10 in

International Residential Code (2021) — Published product data, checked 09/01/2026

Square feet per square yard
9 ft²

Carpet is priced by the square yard while rooms are measured in square feet.

Unit definition — Published product data, checked 09/01/2026

Prices verified 09/01/2026 (US national average, big-box retail shelf price and regional ready-mix quotes). Regional adjustment: Blended from RSMeans city cost index bands and BLS construction wage differentials.

The formula

Risers = total rise ÷ 7.75 in maximum, rounded up. Riser height = total rise ÷ riser count. Treads = risers − 1, less one for each landing, since a landing is its own surface. Nosing runs the stair width for every tread and landing.

Worked examples

108 in rise, 36 in wide

Total rise: 108 Stair width: 36 Landings: 0 Waste: 10

14 risers at 7-11/16 in, 13 treads. About 39 ft of nosing and a full weekend of finishing.

Same flight with a landing

Total rise: 108 Stair width: 36 Landings: 1 Waste: 10

One fewer tread to buy — the landing is its own surface, though it still needs nosing along its edge.

48 in basement stair, 42 in wide

Total rise: 48 Stair width: 42 Landings: 0 Waste: 10

7 risers at 6-7/8 in and 6 treads. Wider stairs need longer treads, which are priced by length and rise sharply past 42 in.

Choosing materials

  • Buy one spare tread. Oak treads are the most expensive linear item in the house per piece, and the first one is always the practice one.
  • Risers are primed and painted, treads are stained and finished. Do the finishing before installation where you can — finishing a staircase in place means nobody uses the stairs for three days.
  • Retrofitting thick treads onto existing stringers eats tread depth. If the original tread was 10 in and you add a 1 in nosing overhang without extending the run, you can push a compliant stair out of code.
  • Check every riser height once the treads are on. Code allows 3/8 in variation across a flight, and a top or bottom step that differs by more is a genuine trip hazard.
  • Carpet over treads is cheaper, quieter and much better underfoot for anyone unsteady. Hardwood looks better and shows every scratch a dog puts in it.

Common questions

How many treads and risers do I need?

Divide total rise by 7.75 in and round up for the riser count. Treads are one fewer, because the top riser lands on the floor above. A 108 in rise gives 14 risers and 13 treads.

Why is there one fewer tread than riser?

Because the floor at the top of the flight acts as the final tread. Every riser has a surface above it, and for the last one that surface is the floor you are stepping onto.

What does it cost to replace stair treads?

Oak treads run $40 to $70 each and risers $12 to $20, so a 13-tread flight is roughly $800 to $1,200 in material. Installed and finished by a carpenter, typically $2,500 to $4,500.

Can I put hardwood treads over carpeted stairs?

Usually yes — the existing treads become the substrate for retrofit tread caps. Watch the tread depth and riser height afterwards, because adding material to the top of each step changes both.

What is the code for riser height?

Maximum 7.75 in for residential stairs, minimum 10 in tread depth, and no more than 3/8 in variation between risers in a flight. The variation rule is the one retrofits most commonly break.

Should I finish treads before or after installing?

Before, if you have anywhere to lay them out. Finishing in place means three days of nobody using the stairs and dust settling into wet polyurethane. Pre-finished treads are worth the premium for exactly that reason.

Related calculators