Stair Calculator Ontario

This stair calculator helps Ontario homeowners determine the required dimensions for stair stringers, treads, and risers based on building code requirements. Simply input your stair dimensions and get precise measurements for construction projects.

How to Use This Calculator

Using our stair calculator is simple:

Enter the total rise of your stairs in inches
Enter the total run of your stairs in inches
Select the number of treads
Click "Calculate" to get your results

The calculator will provide you with:

Required stringer length
Tread depth
Riser height
Visual representation of your stair dimensions

Formulas Used

The calculations are based on Ontario Building Code requirements:

Tread Depth = Run / Number of Treads Riser Height = Rise / Number of Treads Stringer Length = √(Run² + Rise²)

Where:

Run = horizontal distance between stair supports
Rise = vertical distance between stair supports
Number of Treads = steps between supports

Note: These calculations provide nominal dimensions. Actual construction may require additional allowances for materials and tolerances.

Worked Examples

Example 1: Straight Staircase

For a staircase with:

Run: 120 inches
Rise: 60 inches
Number of Treads: 12

The calculator would provide:

Tread Depth: 10 inches
Riser Height: 5 inches
Stringer Length: 134.16 inches

Example 2: Curved Staircase

For a curved staircase with:

Run: 96 inches
Rise: 48 inches
Number of Treads: 8

The calculator would provide:

Tread Depth: 12 inches
Riser Height: 6 inches
Stringer Length: 108.89 inches

Frequently Asked Questions

What are the standard stair dimensions in Ontario?: Standard stair dimensions in Ontario typically follow the Ontario Building Code, which recommends tread depths of 10-12 inches and riser heights of 5-7 inches for residential construction.
How do I calculate the number of treads needed?: Divide the total rise by the desired riser height to determine the number of treads required. For example, a 60-inch rise with 5-inch risers would require 12 treads.
What materials are typically used for stair stringers?: Common materials for stair stringers include 2x6 or 2x8 lumber, metal joists, or engineered wood products. The choice depends on the building's structural requirements and design preferences.
Are there any safety considerations for stair construction?: Yes, stairs should have a minimum tread depth of 10 inches and a maximum riser height of 7 inches to meet Ontario Building Code requirements. Handrails should also be installed according to code specifications.