1. What is a Stair Calculator?

Definition: This calculator estimates the total horizontal length required for a staircase based on step dimensions and landing requirements.

Purpose: It helps architects, builders, and DIYers plan staircase installations and renovations accurately.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L_t \) — Total horizontal length (meters)
• \( R \) — Run per step (horizontal depth of each step in meters)
• \( N \) — Number of steps
• \( L_l \) — Landing length (meters)

Explanation: The run per step multiplied by the number of steps gives the total run of the staircase, and the landing length is added to determine the complete horizontal space requirement.

3. Importance of Stair Calculation

Details: Accurate stair calculations ensure safety, comfort, and compliance with building codes. Proper planning prevents costly mistakes during construction.

4. Using the Calculator

Tips: Enter the run per step (typically 0.25-0.3m), number of steps (calculated from floor height and riser height), and landing length (if applicable). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical run per step?
A: Most building codes recommend 0.25-0.3 meters (10-12 inches) for comfortable stair climbing.

Q2: How do I determine the number of steps?
A: Divide total vertical height by desired riser height (typically 0.15-0.2m). Our Stair Step Calculator can help with this.

Q3: When is a landing required?
A: Building codes typically require landings after every 12-15 steps or when the stair changes direction.

Q4: Does this calculation include the thickness of treads?
A: No, this calculates horizontal space only. Add material thickness separately if needed.

Q5: How does this relate to stair angle?
A: The angle can be calculated using arctan(rise/run). Our Stair Angle Calculator provides this functionality.