Calculate stair dimensions instantly: step Количество, riser Высота, tread depth, stringer length, and stair angle. Supports imperial and metric units. Perfect for builders and DIY projects.
Our Бесплатно stair Калькулятор helps builders, contractors, and DIY enthusiasts Дизайн safe and comfortable stairs. Enter your total rise (Вертикально Высота) and total run (Горизонтально depth), set your preferences, and get Мгновенно calculations for step Количество, riser Высота, tread depth, stringer length, and stair angle. Все calculations follow standard building codes and comfort formulas.
The ideal stair angle for residential stairs is Между 30° and 37°. Steeper angles (up to 45°) are used for stairs Вход tight spaces like attics. Commercial stairs typically stay Между 30° and 35°.
The 2R + G formula is a comfort rule where R = riser Высота and G = tread depth (going). The ideal range is 550–700 mm (22–28 inches). This ensures stairs are comfortable and safe to walk on.
Standard riser Высота is 7–7.75 inches (175–200 mm). Standard tread depth is 10–11 inches (250–280 mm). These dimensions comply with most building codes and provide comfortable stairs.
Stringer length is calculated using the Pythagorean theorem: √(total rise² + total run²). This gives you the diagonal length из the stair stringer board needed.