What Is Flight of Stairs | How Many Flight of Stairs Per Floor

What Is a Flight of Stairs?

The flight of stairs is a set of steps between the two floors or the two landings. A flight of stairs is also known as a stairwell, stairway, just stair, or staircase.

Flight of Stairs
Flight of Stair

Flight is a continuous series of steps between the floor and landing, or between landing. A flight should possess no fewer than 3 risers and no more than 15 risers in it otherwise it might be risky, especially for the young or the elderly.

Stairs can be defined as series of steps suitably arranged to connect various floors of a building. It may similarly be defined as an arrangement of treads, risers, stringers, newel posts, handrails, and balusters, so designed and constructed to give easy and quick access to the various floors.

It must be designed to transmit certain loads, which are comparable to those utilized for the design of the floors. Stairs may be created of Timber, Bricks, Stone, Steel, or Reinforced Cement Concrete.

How to Calculate flight of stairs

To calculate the number of steps in a flight of stairs, you need to know the height of the landing, the height of each step, and the length of the tread. The formula for calculating the number of steps is:

Steps = (Height of landing) / (Height of step)

The height of each step is determined by the rise, which is the vertical distance between each step, and the tread, which is the horizontal surface area on which you step. The standard rise is typically around 7 inches and the standard tread is around 11 inches.

Once you have calculated the number of steps, you can determine the total length of the flight of stairs by multiplying the number of steps by the length of the tread.

This will give you the total distance that the staircase will run, which is important for determining the amount of space required for the staircase and for ensuring that it meets local building codes and safety regulations.

Read More: Components of Staircase | Parts of Staircase

Stairs Require In A Stairs Flight

The flight is a continuous series of stairs between the landings. If there are too many stairs (or steps) in a single flight (without existing broken up by landings) it can be boring to walk up, disorientating to walk down, and if there is a fall, increases the risk that there will be a considerable injury.

Most of the flights of stairs average out at 12 steps or 13 steps but it depends on the height of the staircase, the location of the stairs (as stair height regulations vary between public and private buildings and between countries), and the intention of a staircase (as fire escapes have more specific rules than other types of stairs).

Some Facts About Stairwell

The excellent height of rising 17 cm but the height of rising of steps in ancillary rooms may be up to 22 cm.

To design the stair, you have to understand the tread-to-rise ratio.

The ratio of rise and tread is indicated as,

m = a/s


m = ratio of rising and tread

a = width of tread

s = height of rising.

We construct any stair after specifying the ratio of rising and tread in advance. The staircases have traditionally been constructed of wood, stone, or marble, and iron or steel.

The usage of steel and reinforced concrete has created it possible to design better-looking staircases and add aesthetics to them by creating good curves and additional features.

Escalators and ladders are considered unique types of stairs.

There are some options for the stair too. These are elevators (also known lifts), stair lifts, inclined moving walkways, and ramps.

Total Steps In A Flight

There are various ways to compute the number of steps you will require, but the simplest is to take the whole ceiling height, including the width of the joists helping the floor above and the thickness of the subfloor.

  • A flight of stairs in a house with 8 feet ceilings will have 14 steps if the rise of each step is 7 ¾ inches.
  • If ceilings are 9 feet, then a flight of stairs will have 16 steps if the rise of each step is 7 ¾ inches.
  • If the ceiling is 10 feet, then a flight of stairs will have 17 steps if the rise of each step is 7 ¾ inches.

Total Steps For 8 Feet Ceilings

For example, your house has 8 feet ceilings, with 10 inches-wide joists supporting the floor above. 10 inches wide joists are 9¼ inches wide. You similarly have a ¾ inches subfloor on top of those joists.

Therefore, the total rise from the ground to the top floor of your flight of stairs is 8’ 10”. Transform that total into inches to get 106 inches.

We will utilize the maximum permitted stair rise per the IRC which is 7.75 inches. Divide 106 inches by 7.75 inches and you get 13.7 inches. Therefore, you will need 14 steps. Divide 106 inches by 14 to discover the rise per step and you get 7.6 rises per step.

How Long Is A Stairs Flight?

The length of stairs can differ widely since tread depths frequently observe a wider variance than riser height. Since vertical drop is more of a safety concern per step than tread depth, builders frequently manipulate tread depth to fit horizontal space.

The lowest tread depth of a residential step is 10 inches. Each tread must possess a nosing that is at least ¾ inches beyond the front perimeter of the step and no more than 1 ½ inches. There is no extreme tread length.

Computing the length of a flight of stairs involves recognizing the depth of your tread and the length of the stair tread nosing. The lowest tread nosing is ¾inches. Therefore, if you have 10 inches treads, subtract ¾inches from true horizontal span so, 9¼ inches.

Read More: Dog-Legged Staircase | Dog-Legged Staircase Design | Dog Leg Stairs

How Tall Is A Flight Of Stairs?

A flight of stairs is generally the height of the ceiling plus the framing and subfloor of the floor above where the stairs end. In a space with 8 feet ceilings, a flight of stairs is anywhere from 8 feet 8 inches to just over 9 inches high.

Houses with ceilings that are 9 feet or 10 feet will have stairs that are either 10 feet or 11 feet, respectively. Similarly, the real height depends on the floor framing and, to a lesser extent, the subfloor on the top floor.

To compute the stair height, take the ceiling height and add the width of the joists that frame the ground where the height of the stairs terminates. Generally, this is either 8 inches, 10 inches, or 12 inches dimensional.

Then you have to add the thickness of the subfloor generally between ½inches and ¾inches. Most of the stairs are framed during construction and are computed without the finish floor in place, which is why we just compute the subfloor in the computations.

The landing at the top of a flight of stairs does not compute as a stair “tread”. There is often one additional riser than stair tread because a flight of stairs starts up with a riser and ends with a riser.

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