Formula Used
Number of risers = total rise ÷ selected riser height. The calculator tests riser counts between the minimum and maximum limits.
Actual riser = total rise ÷ final riser count.
Treads per flight = risers in that flight − 1. The landing replaces one going space at the turn.
Run = number of treads × tread depth.
Comfort rule = 2 × riser height + effective going.
Pitch angle = arctangent of riser height ÷ effective going.
Opening width = two stair widths + well gap.
Material estimates use tread area, riser area, landing area, slab thickness, and waste percentage.
Half Landing Staircase Planning Guide
A half landing staircase changes direction by using a landing between two flights. It is often used where a straight stair would need too much length. The landing improves rest, turning space, and movement control. It also helps fit the stair into a compact building bay.
Key Measurements
The first value is total rise. This is the vertical distance from lower finished floor to upper finished floor. The next value is riser height. A steady riser height keeps the stair comfortable. Unequal risers can create unsafe movement. Tread depth controls foot support. Wider treads usually feel easier, but they also increase the required run.
Flight Balance
A half landing design usually divides the risers into two flights. The split may not always be equal. The calculator places the extra riser in the lower flight when the count is odd. This keeps the method simple for early planning. Final drawings should still match local code and engineer review.
Landing Size
The landing should support a safe turn. Its length should normally be at least the stair width. Wider landings are useful for public buildings, furniture movement, and emergency access. The calculator also estimates opening length and opening width. These values help compare the stair with the available floor space.
Comfort and Slope
The comfort rule uses two risers plus one going. Many stair layouts aim for a balanced range near common construction practice. The pitch angle also matters. A steep stair saves space, but it can be harder to climb. A flat stair is easier, but it needs more floor area.
Material Review
This calculator gives approximate finish area, handrail length, and concrete volume. These values are useful for budgeting. They are not final structural quantities. Waste, site trimming, formwork, reinforcement, and edge details can change the final amount. Use the result for planning, comparison, and early estimates.
FAQs
What is a half landing staircase?
It is a stair with two flights joined by a landing. The landing changes direction, commonly by 180 degrees. This design saves length and creates a resting point.
How does the calculator divide the flights?
It divides the total risers between lower and upper flights. If the riser count is odd, the lower flight receives the extra riser for a simple planning layout.
What is the comfort rule?
The comfort rule is two risers plus one going. It helps compare stair proportion. A balanced value usually feels better during normal walking.
Does this replace building code checks?
No. This calculator is for planning and estimating. Always check local building rules, fire requirements, accessibility standards, and structural details before construction.
Why is nosing included?
Nosing affects the effective going. It changes the usable foot placement depth. The calculator subtracts nosing from tread depth for pitch and comfort checks.
How is opening width estimated?
Opening width is calculated as two stair widths plus the well gap. This suits a typical parallel half landing stair arrangement.
Are concrete quantities exact?
No. Concrete volume is an early estimate. Final volume depends on waist slab shape, reinforcement cover, landings, beams, formwork, and structural design.
Can I download the result?
Yes. After calculation, use the CSV or PDF buttons. They create a simple result file for records, comparison, or site discussion.