Straight stair stringer calculator — Construction calculators online

Straight stair stringer calculator

Error calculationPlease check your input
the Calculator will be available after changes in the relevant parameters.
Click "Calculate" to open the options window.
Choose Drawing:

Calculation results

  • Pitch (Stair Angle): 32.54 °
  • Rise: 17.65 mm
  • Going: 27.66 mm
  • Number of Steps: 16 pcs.
  • Stairs Width: 100 mm
  • Minimum Stringer Throat Depth (width): 15.12 mm

Materials for construction

Stair Stringers
  • Stringer Width: 30 mm
  • Length: 522.76 mm
  • Stringer Thickness: 6 mm
  • Quantity: 2 pcs.
  • Wood Volume: 0.188 m3
  • Tread Depth: 35.16 mm
  • Tread Length: 100 mm
  • Tread Thickness: 4 mm
  • Number of Steps: 16 pcs.
  • Wood Volume: 0.225 m3
  • Riser Width: 13.65 mm
  • Riser Length: 100 mm
  • Riser Thickness: 2.5 mm
  • Number of Risers: 15 pcs.
  • Wood Volume: 0.051 m3
  • Handrail Width: 8 mm
  • Handrail Thickness: 4 mm
  • Balustrade Length: 539.83 mm
  • Wood Volume: 0.017 m3
  • Baluster Width: 5 mm
  • Length: 86.85 mm
  • Quantity: 16 pcs.
  • Wood Volume: 0.035 m3

Initial parameters

  • Units: cm mm
  • Color drawing: paint mm
  • Total Rise: 300 mm
  • Total Run: 450 mm
  • Stair Width: 100 mm
  • Number of Steps: 16 pcs.
  • Tread Thickness: 4 mm
  • Nosing (Tread Overlap): 5 mm
Stair Stringers
  • Stringer Thickness: 6 mm
  • Stringer Width: 30 mm
  • Riser Thickness: 2.5 mm
Upper Floor Slab
  • Slab overlap above bottom of stairs (Total Run minus Stairwell): 100 mm
  • Slab Thickness: 20 mm
  • Handrails Height: 90 mm
  • Baluster Width: 5 mm
  • Handrail Thickness: 4 mm
  • Handrail Width: 8 mm
  • Wall Thickness: 20 mm
Choose saving method
Keep a reference to the result of the calculation in the section "My bookmarks" in your account.
Share in social network
Save in social. network.

How to save the calculation on your computer?

  1. Pick up the necessary parameters for the calculation.
  2. Select the appropriate "Method of preservation".
  3. Select "payment Option" for granting access to:
    • Subscription "Newbie" enables access to detailed drawings and calculations. The preservation of each unique calculation is charged separately. In accordance with price list. Any purchased you can re-calculate the free to download an unlimited number of times. The list of "Saved calculations" available at Personal account.
    • Subscription Umelec enables access to detailed drawings and calculations, provides the ability to save and download any of the calculations of unlimited the number of times for the duration of your subscription.
    • Subscription Profi allows you to set the drawings of your logo or off are available. Enables access to detailed drawings and calculations, provides the ability to save and download any of the calculations ofunlimited the number of times for the duration of your subscription.
  4. After successful payment, access to the results of the calculation will be downloaded to Your PC or sent to your mail (which You used for registration), depending on the selected "type of save".
  5. Usually save the results of calculation do not exceed 1 minute.

In case of problems when saving the results of the calculation, please send us a bug report through the form feedback contact page.

Select the subscription for additional features Kalk.Pro

All the proceeds will be used to develop new calculators and improve the functionality of existing ones.

More information about subscriptions can be found here.

It is very important to design comfortable wooden staircase on the second or third floor, which also will be the least traumatic for you and your children, without losing appeal. Our simple calculator can help you to solve the problem of correct calculation of wooden straight flight stringer stairs.

The calculator allows you to perform online calculation of straight staircases on strings. The program generates the results of the calculations of the 3D model straight staircase, drawings of all structural elements with straight stair stringers.


How to calculate staircase on strings online?

You need to measure and input the main dimensions of your straight flight stair - parameters of the staircase, measure the distance between the upper finished floor and first floor (finished). Click the "Calculate" button.

In the end, you will get an interactive  3D model of the staircase designed according to your parameters, the results of calculation include: the angle of the stairs, number of steps, the height and width of each step, risers, and also the wood volume you need to buils your straight stairs. You will get detailed drawings:

  1. side view of the stairs,
  2. topview of stairs,
  3. drawing of the stringers
  4. drawing of steps

If you can not determine the required initial data, just below we will give you common dimensions of a straight stair (its angle, size of steps and etc.).

The recommended parameters of the stairs

There are building codes and standards for the parameters of stairs, height, width of steps, which is very important to avoid injuries. 

Layout of simple straight stringer stairs
  • The width of the opening of the stairs. S and standard value in a private house taking 90 - 110 cm If space is limited, the width of the opening sause, the minimum critical value - 80 cm
  • The height and width of the steps. According to standards the maximum height of stairs may not exceed 200 mm. Usually 15 - 17 cm Optimal width of a step 27 - 30 cm

The standard length of the step 60 - 63 cm the calculations often use the formula "ideal safe ladder", developed centuries ago by French ingeneral Blondel: 2 step height + width of a step = step 60 - 63 cm

  • The angle of incline of the stairs. Optimal comfortable angle for ascent / descent - in the range 29 - 35 degrees.
  • For manufacturing steps and podstupenej use a wooden Board: for rise the optimum thickness of 30 mm; for stages — 40 mm.
  • Minimum ledge of the wooden steps (overhang) above the risers 30 mm, maximum 40 mm. Overhang increases the surface level.
  • The number of stages for a single flight of stairs - no more than 18 pieces. On average, 10 to 12, but of course it depends on the length of the March. Suggest a number of steps to make the odd - thus, to start and finish the ascent or descent the stairs you will be one and the same foot.
  • The height of handrails must extend from 90 cm for security purposes.
  • Finally, do not forget that the minimum height in the aisle stairs, from any step of the March to the next obstacle vertically, must be at least two meters.

If we talk about the loads experienced by a standard staircase in a residential building - 300 kg/m2. P Ragib them should not exceed 1/400 of the span.

3D visualization will allow to evaluate the usability and direct stairs to the stringers, to provide a view of the future straight stairs made of wood, visually to experiment with the number and sizes of steps.


Also see
Rate this page:
(estimate: 5, votes: 175)

Log in or register in order to be able to leave comments.

Specify sizes
Stair Type
Stair Stringers
Upper Floor Slab