How to Measure Stairs for Carpet, Including Landings

Updated September 2026 · Home Project Resources

Learning how to measure stairs for carpet is mostly learning to stop treating a staircase like a floor. A room is one rectangle. A staircase is a stack of small, slightly different rectangles, each of which bends over a nose, and some of which are curved, tapered, or open on one side. Measure it like a room, length times width, and you will come up short on material and long on seams in exactly the places everybody sees.

The good news is that the job takes a flexible tape, a notepad, and about half an hour for a typical flight. The method below measures every step as its own piece, handles the odd shapes with paper templates, treats the landing as a small room, and records pile direction so the pieces you order can actually be cut the way they need to lie.

Updated September 2026

Measuring the hallway and landing too? Once you have the flat areas, run them through our free flooring calculator to turn square feet into an order with a waste allowance built in. The stair pieces themselves you will total by hand using the worksheet below, because no area formula describes a step.

The anatomy of a carpeted step

Every measurement on a staircase refers to one of four parts. Get the vocabulary straight first, because installers, suppliers, and the worksheet all use it.

Two more terms show up constantly. The crease, sometimes called the crotch, is the inside corner where the back of a tread meets the bottom of the riser above it. That is where carpet is tucked and where seams hide. The return is the end of a tread on an open sided stair, where the nose turns the corner and runs back toward the wall.

If you are still building or rebuilding the stairs themselves, the rise, run, and code dimensions belong to a different page. How to build stairs covers riser counts, tread depth limits, and nosing rules. This page assumes the stairs exist and you are covering them.

How to measure stairs for carpet, step by step

This is the full method for a straight flight. Odd shapes, landings, and runners get their own sections after it.

1. Number the steps from the bottom. Put a small piece of painter's tape on each riser with a number. Step 1 is the lowest tread. The top riser, the one that meets the upstairs floor, gets noted separately because it usually belongs to the hallway carpet rather than to the flight.

2. Measure the width of every step at the front and the back. Hold the tape at the nose edge and read wall to wall, then do the same tight against the riser. On boxed stairs these two numbers differ more often than you would expect, because drywall bows and old houses settle. Record the larger of the two.

3. Measure the carpet path on each step, not the tread and riser separately. Take a cloth or vinyl tailor's tape, or a flexible sewing tape, and press one end into the crease at the back of the tread. Run it forward across the tread, over the nose, and down the face of the riser into the crease of the step below, following the path the carpet will actually take. That single number is the length of the piece for that step. A steel tape cannot follow a nose, so do not use one for this measurement.

4. Repeat for every step. Yes, every one. Stairs built by hand vary by a quarter inch here and a half inch there, and on older houses a step near the top can differ from one near the bottom by more than an inch. The cost of measuring each step is five extra minutes. The cost of a piece that falls short is a visible gap at the crease.

5. Add a trimming allowance. Installers cut each piece a little long and trim it in place. Add an inch or two to every carpet path length and an inch or so to every width. Write the raw measurement and the allowance separately so anybody checking your sheet can see what you did.

6. Note the install style you want. If the carpet will be wrapped tightly around each nose and tucked under it, the path follows the underside of the nose too, which adds length. Run your flexible tape around the nose and up underneath it to the riser for one sample step, compare it to the simple path, and add the difference to every step. The quoting differences between styles are covered on cost to carpet a room; here all you need is the extra length.

7. Record pile direction on the sheet. Draw an arrow on the sketch pointing down the stairs. That arrow is the direction the pile should lean on every step, and it decides how each piece is oriented on the roll. More on that below.

8. Measure the landing and the top hallway join as flat areas. Treat them as small rooms, covered in their own sections below.

9. Total the pieces. Add up the carpet path lengths, note the widest width, and list the odd shaped steps separately with their template dimensions. That list, not a square footage number, is what you hand to the supplier or installer.

A measuring worksheet you can copy

Copy this table onto a notepad before you start. One row per step, plus rows for anything unusual.

Leave the notes column generous. Balusters that sit on the tread, a vent in a riser, a missing return, a squeak you want fixed before the carpet goes down: all of it belongs on the sheet, because all of it changes how the piece is cut or what has to happen first.

Boxed stairs versus open sided stairs

The biggest difference between two staircases of the same size is what happens at the sides.

Boxed stairs have a wall on both sides. Every piece of carpet runs from wall to wall and is tucked or trimmed against the skirt board or drywall. Measurement is straightforward, with one catch: the walls are rarely parallel. Take the front and back widths described above, and if the difference on any step is more than about half an inch, flag it. The installer will cut that step to the wider number and scribe the edge.

Open sided stairs have one side, or both, exposed to a railing and balusters. Here you have a decision to make before you can measure, because the carpet can end in two ways:

• Stopping short of the open edge. The carpet ends a few inches in from the return, leaving a band of finished wood exposed. Measure the width from the wall to the point where the carpet will stop, and mark that point on every tread with tape so the line is consistent up the flight.
• Wrapping the open edge. The carpet continues over the return and is finished against the side of the stringer or skirt. Measure the width all the way to the outside of the return, then add the depth of the return around the corner. This is fussier work and every baluster that stands on the tread needs a cut around it.

On open sided stairs, count the balusters on each tread and note where they sit. Two balusters per tread is common. A baluster set into the middle of the tread rather than at the edge forces a slit in the carpet, and that is easier to plan for than to discover.

Bullnose steps and pie shaped winders

These are the steps where most measuring mistakes happen, and the fix is the same for both: stop measuring with a tape and make a template.

Bullnose starting steps

A bullnose step, usually the bottom step or the bottom two, has a rounded end on one side or both. The tread is wider than the rest of the flight and the riser curves around the round end.

1. Lay a sheet of kraft paper, builder's paper, or flattened cardboard on the tread. Tape it down.
2. Crease the paper along the edge of the tread and the curve with your thumb, then trace the outline with a pencil.
3. Measure the template's longest dimension side to side and its deepest dimension front to back. That bounding rectangle is the size of carpet the tread needs.
4. For the riser, run the flexible tape around the curve at mid height, from wall to wall or from wall to the far end of the curve. The riser of a bullnose step is noticeably longer than the tread is wide, because it is measured around an arc.
5. Add a generous allowance to the riser length. Carpet going around a curve is either kerfed with relief cuts or stretched and stapled in small steps, and both use extra material.

Label the template with the step number and an arrow pointing down the stairs, and keep it. An installer who sees an accurate paper outline of your bullnose will thank you, and the template survives even if your written numbers get lost.

Pie shaped winder steps

Winders are the wedge shaped treads that turn a corner without a landing. Each one is narrow at the inside of the turn and wide at the outside, and no two in a set are quite the same shape.

Measure each winder as its own piece:

• The length of the nose edge, which is the longest edge on most winders.
• The length of the back edge, along the riser behind.
• The depth at the widest point, which is at the outside wall.
• The carpet path at the widest point, run over the nose and down the riser the same way as a straight step.

Then make a paper template of each winder anyway. The bounding rectangle for a pie shaped tread is much larger than its actual area, and that is correct: the carpet for each winder comes from a rectangle, and the triangle of scrap beside it is waste. On a turn with three or four winders, that scrap adds up. Flooring waste factor explains why curved and angled features need more allowance than the standard percentage, and the stair section there applies directly to winders.

Pile direction is the other reason winders use extra material. Each winder piece should have its pile leaning toward its own nose, which points in a slightly different direction on every step around the turn. The installer cannot simply cut a strip and fold it around the corner. Each wedge is oriented individually on the roll.

Landings and hallway joins

Landings and the join at the top of the flight are flat areas, but they connect to the stair pieces, and how they connect decides where the seams go.

Measuring a landing

Measure a landing like a small room. Take the length and width wall to wall at the floor, check that it is square by measuring both diagonals, and draw it on your sketch. Then add two things:

• The nose wrap at the landing's front edge. The landing's leading edge is the nose of the step below it. The carpet on the landing continues over that nose and down the riser, so add the carpet path of that nose and riser to the landing's depth.
• The pile arrow. On a quarter turn landing, the flight below arrives from one direction and the flight above leaves in another. Draw the arrow for the flight that meets the landing's nose, because that edge is the most visible.

An L shaped or half turn landing can be split into rectangles. The square footage calculator handles the L shape if you want the area, but record the rectangle dimensions too, since the carpet is cut from rectangles, not from a total.

The top of the stairs

Where the flight meets the upstairs hallway, the usual approach is to run the hallway carpet over the top nose and down the top riser, joining the first stair piece in the crease below. A seam in the crease is practically invisible. A seam on the nose or across the middle of a tread is visible forever and wears open where feet land.

So when you measure the hall, measure from the far end of the hallway to the top nose, then add the carpet path over that nose and down the top riser. Measure the hallway width at several points along its length. Hallways are narrow enough that a quarter inch of bow in one wall shows as a gap at the baseboard.

If a different flooring meets the top of the stairs, such as hardwood in the hall, measure only the top riser for carpet and note that the nose will need a transition piece or a finished stair nose. That changes how the top step is installed, and your installer needs to know before cutting.

Pile direction and why it controls the order

Carpet pile leans in one direction. You can see it by brushing your hand across a sample: one way looks lighter and feels smooth, the other way looks darker and feels rougher. On a staircase, the pile should lean down the stairs, toward each nose.

There are two reasons. The first is wear. Feet coming down a staircase push toward the nose, and pile laid in that direction wears smoothly rather than being scuffed against its grain. The second is appearance. If adjacent pieces run in different directions, each step reads as a slightly different color, and a striped staircase is hard to unsee.

For measuring, pile direction means each stair piece is cut with its length, the carpet path from crease to crease, running along the length of the roll, and its width running across the roll. Record your widest step and your longest carpet path clearly so the supplier can confirm the pieces fit that orientation. The yardage and roll layout, meaning how the pieces are nested, is the installer's calculation. Give them clean inputs and let them lay it out.

The landing and the hallway should match the flight wherever they touch. That is one reason a landing sometimes needs more carpet than its size suggests: it is being cut in the orientation that matches the stairs rather than the orientation that wastes the least.

Measuring for a stair runner

A runner is a strip of carpet down the center of the stairs, leaving finished wood exposed on both sides. The measuring is different because you are choosing a width rather than filling one.

1. Pick the reveal. The reveal is the exposed wood on each side. Measure the stair width, subtract the runner width you are considering, and divide by two. Equal reveals on both sides matter more than the exact figure. Runners are sold in stock widths, so check what widths your chosen product comes in before you settle on a reveal.

2. Measure the length down the stairs. For each step, take the carpet path length along the centerline of the stair, where the runner will actually sit. Add them. Add the landing if the runner continues across it, measured along the path the runner will follow.

3. Account for the install style. A runner wrapped tightly around each nose and fastened underneath uses more length per step than one that drops straight down the riser. Measure one sample step both ways and apply the difference to the whole flight.

4. Plan the turns. A runner cannot bend around a landing corner. It is cut and mitered or joined at the landing, and the pile has to keep running down the flight on both sides of the join. Add at least the width of the runner in extra length for every change of direction.

5. Plan the ends. The top of a runner either ends at the top riser or continues into the hall. The bottom ends at the floor, usually just past the bottom riser. Decide both before you total.

6. Mark stair rods or brackets if you are using them. Decorative rods sit in the crease of each step, so their position does not change the length, but their brackets need a clear space on each side of the runner. Keep that in mind when choosing the reveal.

Runners on winders and bullnose steps are usually cut to the shape of each tread and bound on the edges, which makes them a custom job. Templates for those steps are the only reliable way to get them quoted.

Pad on the stairs

Every stair measurement you just took also governs the pad, but the pad is cut differently: it covers the tread and wraps the nose, and it generally does not continue down the riser. The spec, density, and the per tread measurement for stair pad are covered on carpet padding cost, including why stairs want the densest pad in the house. Measure the tread depth plus the nose on your worksheet and you have what that page asks for.

One stair specific check before any pad goes down: a thick pad plus a thick carpet can round a nose until it feels soft underfoot and loses its crisp edge, which makes a staircase less secure to walk on. If you are carpeting stairs that were previously bare, stand on the top step with a sample of your chosen carpet folded over a pad sample on the nose, and feel it before you order.

Worked example: a flight with a bullnose, winders, and a landing

Here is a realistic staircase measured start to finish.

The stairs run up from a living room. The bottom step is a bullnose on the open side. Steps 2 through 7 are straight, boxed on the wall side and open to a railing on the other, with the carpet stopping short of the open edge. A quarter turn landing sits after step 7. After the landing come three winders, then five straight boxed steps to the upstairs hall.

What this sheet tells the supplier is far more useful than a square footage number. It says there are eleven straight pieces with known dimensions, three winder templates, one bullnose template with a long curved riser, a landing with a specific pile orientation, and a hall piece that wraps the top nose. It flags one step with crooked walls. It says the open side needs a consistent stop line, not a return wrap.

Notice the straight steps did not all measure the same. On this flight, the carpet paths ran from 18.5 to 19.25 inches. Ordering eleven identical pieces at 18.5 inches would have left several steps short at the crease.

Take the hallway measurement separately, add it to the landing on the flooring calculator for the flat area with waste, and keep the stair list alongside it. That is a complete measurement.

Mistakes that cost the most

Measuring one step and multiplying. It is the single most common error. Stairs vary, and the variation lands at the crease where it shows.

Using a steel tape for the carpet path. It cannot follow a nose, so it undercounts every step by the depth of the nose profile.

Forgetting the nose on the landing. The landing's front edge is a stair nose. Measured as a flat rectangle, it comes up short by one riser.

Measuring winders as triangles. Their area is small, but the carpet comes from a rectangle. The bounding rectangle is the real requirement.

Deciding the open side later. Stop short or wrap the return changes the width of every open sided step. Decide before measuring.

Ignoring pile direction on the landing. A landing cut in the least wasteful orientation can end up with its pile running across the stairs, and it will look like a different carpet.

Not flagging repairs. A loose tread, a squeaky step, or a cracked nose should be fixed before carpet covers it. Note it on the sheet so it gets scheduled first.

Frequently asked questions

How do I measure stairs for carpet if every step is different?

Measure each step as its own piece. Number them from the bottom, record the width at the nose and at the riser, and run a flexible tape from the back crease over the nose and down to the crease below for the carpet path. Add a trimming allowance to each. Differences of a quarter inch or more between steps are normal and are exactly why per step measurement is the method.

Do I include the landing with the stairs or with the hallway?

Measure it as its own small room, then add the nose and riser at its front edge, since the landing carpet wraps that nose. Whether the landing is quoted with the stairs or the flat areas depends on the installer, but your measurement should record it separately with its pile direction so it can go either way.

How do you measure a pie shaped winder step for carpet?

Record the nose edge, the back edge, and the deepest carpet path, then make a paper template of the tread. The carpet for each winder is cut from the bounding rectangle around that shape, so order to the rectangle rather than the wedge's area. Each winder is oriented separately so its pile leans toward its own nose.

Which way should carpet pile run on stairs?

Down the stairs, leaning toward each nose. That orientation wears evenly as people walk down and keeps every step the same apparent color. The landing and the hallway where they meet the flight should match it.

How much extra should I add when measuring stairs for carpet?

Add an inch or two of length and about an inch of width to each straight step as a trimming allowance, and more on curved risers and winders, where templates set the real size. The order level waste allowance on top of that is a separate question, and flooring waste factor covers how stairs and curved features change it.

How do I measure for a stair runner instead of wall to wall carpet?

Choose the runner width first and confirm it leaves equal reveals on both sides. Measure the carpet path for each step along the centerline where the runner will sit, add the landing path if it continues, and add extra length at every turn and for a wrapped nose if that is the style. Runners on winders and bullnose steps are custom cut to templates.

Do open sided stairs need more carpet?

Only if the carpet wraps the return. If it stops short of the open edge, the width is simply measured to your chosen stop line. If it wraps, add the depth of the return around the corner on every open step, and note the balusters that stand on each tread, since each one needs a cut.

Can I use a square footage number to order carpet for stairs?

Not for the stair pieces. Square footage describes flat areas, and a staircase is a list of bent rectangles with specific orientations. Use area for the landing and hall, and hand over a per step list with templates for everything else.

Related: Cost to carpet a room covers how stairs and rooms are quoted and how install style changes a quote. Carpet padding cost explains stair pad density and how the pad is cut per tread. Flooring waste factor sets the allowance for curved and angled features. How to build stairs covers riser and tread dimensions if the stairs need work first, and the flooring calculator turns the landing and hallway into an order.