How many stairs in 12′, 10′, 11′, 9′, 8 feet height of ceiling? To calculate the number of stairs needed for a certain height of ceiling, you’ll need to know the height of each step or riser. The standard riser height is typically around 7 inches, but it can vary based on local building codes and personal preferences.

Assuming a riser height of 7 inches, you can calculate the number of stairs for each ceiling height as follows:

1. 12 feet ceiling: 12 feet * 12 inches/foot / 7 inches/step = 20.57 steps (round up to 21 steps).

2. 10 feet ceiling: 10 feet * 12 inches/foot / 7 inches/step = 17.14 steps (round up to 18 steps).

3. 11 feet ceiling: 11 feet * 12 inches/foot / 7 inches/step = 18.857 steps (round up to 19 steps).

4. 9 feet ceiling: 9 feet * 12 inches/foot / 7 inches/step = 15.429 steps (round up to 16 steps).

5. 8 feet ceiling: 8 feet * 12 inches/foot / 7 inches/step = 13.714 steps (round up to 14 steps).

Staircase design depending on local Building Code guideline in your location, to complete the comfort zone, carpenter and the architect design the staircase or stairs according to code. There is a lot of factors is kept in consideration while designing the staircase such as what will be the the relationship between rise and run ratio, what will be stringer length and what will be landing and ceiling height.

Number of steps or stairs depending on the height of a riser to each thread and it will be also affected by pitch of the stair or staircase. Number of steps or number of stairs or number of riser is same things. Basically all are depending on height of stairs which you will need to go up which all are based on local building Code that says that you need to achieve comfort zone and a relationship between rise and run.

There is a various component of stair or staircase such as step, riser, tread or going, stringer length, waist slab, landing and flight. Tread is the horizontal top portion of a step where foot rests is known as tread. The size of tread or going or run ranges from 270 mm or 11″ for residential buildings and factories, hospitals and public buildings to 300mm or 12″ where large number of persons use the staircase. In some cases nosing is provided the tread is projected outward to increase the space. Maximum nosing will be 1 inch.

Riser is the vertical distance between two successive steps is termed as riser. The size of the riser ranges from 150 mm or 6″ for public buildings to 190 mm 7- 1/4″ for residential buildings and factories. Waist is the thickness of the waist-slab on which steps are made is known as waist. The steps of the staircase resting on waist-slab can be made of bricks or concrete. Going is the horizontal projection between the first and the last riser of an inclined flight. The going should not be less than 250mm or 10″.

There is General Guidelines to follow while desining the staircase- the respective dimensions of tread and riser for all the parallel steps should be the same in consecutive floor of a building. The minimum vertical headroom above any step should be 2 m. Generally, the number of risers or step in a flight should be restricted to twelve. The minimum width of stair should be 3.5 feet. In public building, cinema halls etc., large widths of the stair should be provided. Also angle of inclination is not more than 40 degree to horizontal.

Number of steps or stairs depending on the height of a riser to each thread and it will be also affected by pitch of the stair or staircase. In this artical you know about how many stairs in 12′, 10′, 11′ & 9 feet height of ceiling and how do you calculate the number of stairs required for any given height such as 10 feet, 11 feet, 9 feet, 8 feet and 12 feet.

**How many stairs in 12′, 10′, 11′ & 9 feet height of ceiling**

Usually the Riser (height of step) will be between 7′-1/4″ to 7′-3/4″ and minimum run at least 10″ and maximum to 11″ to 12″. Many carpenter and architect follow the rules to determine comfort rule as rise plus run is equal to 18″ or 2 times rise + run is equal to 25″.

Total height from top of 1st floor to top of 2nd floor which is divide by 7 inch to give number of steps or stairs or of riser in any particular height of ceiling which you will need to go up.

To calculate or find out total number of stairs or riser for any particular height of ceiling, divide the height of ceiling or floor by the average Riser height of 7″ and you will get the number of average stairs or riser or steps you need. For example, suppose your height of ceiling is 12 feet high, generally you will need 20 stairs or steps to go up (12 × 12 ÷ 7 = 20).

Formula for number of stairs or steps = total height × 12 ÷ 7 or height of staircase/ height of one riser.

**How many stairs in 12 feet hight**

For a 12 foot high ceiling or floor, a building requires 21 stairs (or riser or steps), 20 number of tread (going) and an average stringer length of 14 feet to go up. So in 12 feet height, there is a requirement of 21 stairs.

As per thumb rule and various building code or IRC, assume standard design, for 12 feet height of ceiling or floor, you will need approximately 21 stairs or steps or riser, 20 number of tread or going and on average 14 feet of stringer to go up. Hence there are 21 stairs or steps or riser for 12 feet height of staircase. Mathematical calculation such as 1) no. of riser or steps or stairs in 12 feet height of staircase or ceiling = 12 ×12÷ 7 = 20.57, rounding it near to 21, 2) no. of riser in a flight = 21 ÷2 = 10.5 rounding it 11, 3) no of tread = 11_1 = 10, 4) total run = 10 × 12″ = 120″ and 5) staircase length = 120″ + 48″ = 168″ or 14 feet.

**How many stairs in 11 feet hight**

For a 11 foot high ceiling or floor, a building requires 19 stairs (or riser or steps), 18 number of tread (going) and an average stringer length of 13 feet to go up. So in 11 feet height, there is a requirement of 19 stairs.

As per thumb rule and various building code or IRC, assume standard design, for 11 feet height of ceiling or floor, you will need approximately 19 stairs or steps or riser, 18 number of tread or going and on average 13 feet of stringer to go up. Hence there are 19 stairs or steps or riser for 11 feet height of staircase. Mathematical calculation such as 1) no. of riser or steps or stairs in 11 feet height of staircase or ceiling = 11 ×12÷ 7 = 18.85, rounding it near to 19, 2) no. of riser in a flight = 19 ÷2 = 9.5 rounding it 10, 3) no of tread = 10_1 = 9, 4) total run = 9 × 12″ = 108″ and 5) staircase length = 108″ + 48″ = 156″ or 13 feet.

**How many stairs in 10 feet hight**

For a 10 foot high ceiling or floor, a building requires 17 stairs (or riser or steps), 16 number of tread (going) and an average stringer length of 12 feet to go up. So in 10 feet height, there is a requirement of 17 stairs.

As per thumb rule and various building code or IRC, assume standard design, for 10 feet height of ceiling or floor, you will need approximately 17 stairs or steps or riser, 16 number of tread or going and on average 12 feet of stringer to go up. Hence there are 17 stairs or steps or riser for 10 feet height of staircase. Mathematical calculation such as 1) no. of riser or steps or stairs in 10 feet height of staircase or ceiling = 10 ×12÷ 7 = 17.14, rounding it near to 17, 2) no. of riser in a flight = 17 ÷2 = 8.5 rounding it 9, 3) no of tread = 9_1 = 8, 4) total run = 8 × 12″ = 96″ and 5) staircase length = 96″ + 48″ = 144″ or 12 feet.

**How many stairs in 9 feet hight**

For a 9 foot high ceiling or floor, a building requires 15 stairs (or riser or steps), 14 number of tread (going) and an average stringer length of 11 feet to go up. So in 9 feet height, there is a requirement of 15 stairs.

As per thumb rule and various building code or IRC, assume standard design, for 9 feet height of ceiling or floor, you will need approximately 15 stairs or steps or riser, 14 number of tread or going and on average 11 feet of stringer to go up. Hence there are 15 stairs or steps or riser for 9 feet height of staircase. Mathematical calculation such as 1) no. of riser or steps or stairs in 9 feet height of staircase or ceiling = 9 ×12÷ 7 = 15.42, rounding it near to 15, 2) no. of riser in a flight = 15 ÷2 = 7.5 rounding it 8, 3) no of tread = 8_1 = 7, 4) total run = 7 × 12″ = 84″ and 5) staircase length = 84″ + 48″ = 132″ or 11 feet.

**How many stairs in 8 feet hight**

For a 8 foot high ceiling or floor, a building requires 14 stairs (or riser or steps), 13 number of tread (going) and an average stringer length of 10 feet to go up. So in 8 feet height, there is a requirement of 14 stairs.

As per thumb rule and various building code or IRC, assume standard design, for 8 feet height of ceiling or floor, you will need approximately 14 stairs or steps or riser, 13 number of tread or going and on average 10 feet of stringer to go up. Hence there are 14 stairs or steps or riser for 7 feet height of staircase. Mathematical calculation such as 1) no. of riser or steps or stairs in 8 feet height of staircase or ceiling = 8 ×12÷ 7 = 13.71, rounding it near to 14, 2) no. of riser in a flight = 14 ÷2 = 7, 3) no of tread in one flight = 7_1 = 6, 4) total run = 6 × 12″ = 72″ and 5) staircase length = 72″ + 48″ = 120″ or 10 feet.

**How many stairs in 7 feet hight**

For a 7 foot high ceiling or floor, a building requires 12 stairs (or riser or steps), 11 number of tread (going) and an average stringer length of 9 feet to go up. So in 7 feet height, there is a requirement of 12 stairs.

As per thumb rule and various building code or IRC, assume standard design, for 7 feet height of staircase or floor or flight, you will need approximately 12 stairs or steps or riser, 11 number of tread or going and on average 9 feet of stringer to go up. Mathematical calculation such as 1) no. of riser or steps or stairs in 7 feet height of staircase or ceiling = 7 ×12÷ 7 = 12. Hence there are 12 stairs or steps or riser for 7 feet height of staircase.

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**How many stairs in 6 feet hight of flight**

For a 6 foot high ceiling or floor, a building requires 10 stairs (or riser or steps), 9 number of tread (going) and an average stringer length of 8 feet to go up. So in 6 feet height, there is a requirement of 10 stairs.

As per thumb rule and various building code or IRC, assume standard design, for 6 feet height of staircase or floor or flight, you will need approximately 10 stairs or steps or riser, 10 number of tread or going and on average 8 feet of stringer to go up. Mathematical calculation such as 1) no. of riser or steps or stairs in 6 feet height of staircase or ceiling = 6 ×12÷ 7 = 10. Hence there are 10 stairs or steps or riser for 5 feet height of staircase.

**How many stairs in 5 feet hight of flight**

For a 5 foot high ceiling or floor, a building requires 9 stairs (or riser or steps), 8 number of tread (going) and an average stringer length of 7 feet to go up. So in 6 feet height, there is a requirement of 9 stairs.

As per thumb rule and various building code or IRC, assume standard design, for 5 feet height of staircase or floor or flight, you will need approximately 9 stairs or steps or riser, 8 number of tread or going and on average 7 feet of stringer to go up. Mathematical calculation such as 1) no. of riser or steps or stairs in 5 feet height of staircase or ceiling = 5 ×12÷ 7 = 9. Hence there are 9 stairs or steps or riser for 5 feet height of staircase.

**How many stairs for 20 inches**

As per thumb rule and various building code or IRC, assume standard design, for 20 inches height of staircase, you will need approximately 3 stairs or steps or riser, 3 number of tread or going to go up. Mathematical calculation such as 1) no. of riser or steps or stairs in 20 inches height of staircase or ceiling = 20÷ 7 = 3. Hence there are 3 stairs or steps or riser for 20 inches height of staircase.

**How many stairs for 30 inches**

As per thumb rule and various building code or IRC, assume standard design, for 30 inches height of staircase, you will need approximately 4 stairs or steps or riser, 4 number of tread or going to go up. Mathematical calculation such as 1) no. of riser or steps or stairs in 30 inches height of staircase or ceiling = 30÷ 7 = 4. Hence there are 4 stairs or steps or riser for 30 inches height of staircase.

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**How many stairs for 36 inches**

As per thumb rule and various building code or IRC, assume standard design, for 36 inches height of staircase, you will need approximately 5 stairs or steps or riser, 5 number of tread or going to go up. Mathematical calculation such as 1) no. of riser or steps or stairs in 36 inches height of staircase or ceiling = 36÷ 7 = 5. Hence there are 5 stairs or steps or riser for 36 inches height of staircase.

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**How many stairs in 12′, 10′, 11′, 9′, 8 feet height of ceiling**

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**How many stairs for 48 inches**

As per thumb rule and various building code or IRC, assume standard design, for 48 inches height of staircase, you will need approximately 7 stairs or steps or riser, 7 number of tread or going to go up. Mathematical calculation such as 1) no. of riser or steps or stairs in 48 inches height of staircase or ceiling = 48÷ 7 = 7. Hence there are 7 stairs or steps or riser for 48 inches height of staircase.

As per thumb rule and various building code or IRC, assume standard design, for 12 feet height of staircase, you will need approximately 21 stairs and for 10 feet height you need 19 stairs to go up.

**How many steps needed to go up 8 feet**

To go up 8 feet high, there are about 13-14 steps are needed. You would need approximately 13 or 14 steps to go up 8 feet height. To calculate steps needed to go up 8 feet, used the formula, no. of steps needed = (8 × 12)/7 minus 1 = 13 or 14 steps. 7 inches is standard riser height. Thus, to go up 8 feet high, there are 13 or 14 steps needed.

**How many steps needed to go up 9 feet**

To go up 9 feet high, there are about 15-16 steps are needed. You would need approximately 15 or 16 steps to go up 9 feet height. To calculate steps needed to go up 9 feet, used the formula, no. of steps needed = (9 × 12)/7 minus 1 = 15 or 16 steps. 7 inches is standard riser height. Thus, to go up 9 feet high, there are 15 or 16 steps needed.

**How many steps needed to go up 10 feet**

To go up 10 feet high, there are about 17-18 steps are needed. You would need approximately 17 or 18 steps to go up 10 feet height. To calculate steps needed to go up 10 feet, used the formula, no. of steps needed = (10 × 12)/7 minus 1 = 17 or 18 steps. 7 inches is standard riser height. Thus, to go up 10 feet high, there are 17 or 18 steps needed.

**How many steps needed to go up 11 feet**

To go up 11 feet high, there are about 18-19 steps are needed. You would need approximately 18 or 19 steps to go up 11 feet height. To calculate steps needed to go up 11 feet, used the formula, no. of steps needed = (11 × 12)/7 minus 1 = 18 or 19 steps. 7 inches is standard riser height. Thus, to go up 11 feet high, there are 18 or 19 steps needed.

**How many steps needed to go up 12 feet**

To go up 12 feet high, there are about 20-21 steps are needed. You would need approximately 20 or 21 steps to go up 12 feet height. To calculate steps needed to go up 12 feet, used the formula, no. of steps needed = (12 × 12)/7 minus 1 = 20 or 21 steps. 7 inches is standard riser height. Thus, to go up 12 feet high, there are 20 or 21 steps needed.

**How many steps needed to go up 4 feet**

To go up 4 feet high, there are about 6-7 steps are needed. You would need approximately 6 or 7 steps to go up 4 feet height. To calculate steps needed to go up 4 feet, used the formula, no. of steps needed = (4 × 12)/7 minus 1 = 6 or 7 steps. 7 inches is standard riser height. Thus, to go up 4 feet high, there are 6 or 7 steps needed.

**How many steps needed to go up 5 feet**

To go up 5 feet high, there are about 8-9 steps are needed. You would need approximately 8 or 9 steps to go up 5 feet height. To calculate steps needed to go up 5 feet, used the formula, no. of steps needed = (5 × 12)/7 minus 1 = 8 or 9 steps. 7 inches is standard riser height. Thus, to go up 5 feet high, there are 8 or 9 steps needed.

**How many steps needed to go up 6 feet**

To go up 6 feet high, there are about 10-11 steps are needed. You would need approximately 10 or 11 steps to go up 6 feet height. To calculate steps needed to go up 6 feet, used the formula, no. of steps needed = (6 × 12)/7 minus 1 = 10 or 11 steps. 7 inches is standard riser height. Thus, to go up 6 feet high, there are 10 or 11 steps needed.

**How many steps needed to go up 7 feet**

To go up 7 feet high, there are about 11-12 steps are needed. You would need approximately 11 or 12 steps to go up 7 feet height. To calculate steps needed to go up 7 feet, used the formula, no. of steps needed = (7 × 12)/7 minus 1 = 11 or 12 steps. 7 inches is standard riser height. Thus, to go up 7 feet high, there are 11 or 12 steps needed.

**Conclusions:-**

For a 12 foot high ceiling or floor, a building requires 21 stairs (or riser or steps), 20 number of tread (going) and an average stringer length of 14 feet to go up. So in 12 feet height, there is a requirement of 21 stairs.