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Staircase Calculator
Calculate step dimensions, number of steps, and stair angle for safe and comfortable stairs.
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Stair Calculation Results
Enter dimensions to calculate stair specifications.
How to Use the Staircase Calculator
This professional tool helps architects, builders, and DIY enthusiasts design perfect stairs by calculating:
- Number of Steps: Based on total height and desired rise
- Step Dimensions: Comfortable rise and run measurements
- Stair Angle: Ideal slope for safety and comfort
- Total Run: Horizontal space required for the staircase
Standard Dimensions
- Residential Stairs: 7-8 inch rise, 9-11 inch run
- Commercial Stairs: 6-7 inch rise, 11-12 inch run
- Maximum Rise: 7.75 inches (residential), 7 inches (commercial)
- Minimum Run: 10 inches (residential), 11 inches (commercial)
Safety Requirements
- ✅ Consistent step dimensions
- ✅ Handrails at 34-38 inches height
- ✅ Minimum 36 inch width
- ✅ Proper head clearance (≥ 6'8")
- ✅ Non-slip surfaces
Why Calculate Stair Dimensions?
- ✅ Safety: Prevent trips and falls
- ✅ Comfort: Create ergonomic stairs
- ✅ Code Compliance: Meet building regulations
- ✅ Cost Savings: Avoid material waste
- ✅ Aesthetics: Create visually appealing designs
Frequently Asked Questions
What is the ideal stair angle?
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The ideal stair angle is between 30° and 35°. This provides a comfortable slope that's neither too steep nor too shallow. Our calculator determines the exact angle based on your step dimensions.
How do I calculate the number of steps?
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Divide the total height (floor to floor) by your desired step rise. Round up to the nearest whole number to determine the number of steps. Our calculator does this automatically and adjusts the actual rise for consistency.
What is the 18-inch rule for stairs?
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The 18-inch rule states that the sum of two risers and one tread should equal approximately 18 inches (2R + T ≈ 18). This formula helps create comfortable stairs that follow natural walking rhythms.
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