Stair Calculator UK - Concrete Stairs & Steps

Calculating stairs steps requires dividing total rise by individual riser height. UK Building Regulations: maximum riser height is 220mm, minimum tread depth is 220mm. For a 1700mm total rise with 170mm risers: 1700 ÷ 170 = 10 steps. Tread calculation: if you have 3000mm horizontal run with 10 treads, each tread = 300mm. The golden rule for calculations for stairs: 2R + T should equal 550-700mm (R=riser, T=tread). Example: 2(170) + 280 = 620mm ✓ comfortable. Our stair calculator verifies these building regulation requirements automatically while calculating concrete volume.

A stair carpet calculator measures total coverage area. How do you calculate carpet for stairs? Add tread depth + riser height for each step, multiply by stair width, then by number of steps. Standard UK stairs example: 13 steps with 250mm treads, 180mm risers, 900mm width: (0.25 + 0.18) × 0.9 × 13 = 5.03m². Add 10% wastage = 5.5m² carpet needed. For runners (not full width), measure exact width required. Professional tip: for stairs with landings, calculate landing area separately. While our calculator focuses on concrete volume, the same measurement principles apply - accurate step dimensions ensure correct material calculations whether for concrete, carpet, or stair lift installations.

Bag calculations for outdoor stairs depend on step dimensions and number of steps. For garden steps measuring 1200mm wide × 300mm deep × 150mm thick with 8 steps: volume per step = 0.054m³. Total 8 steps = 0.432m³ = 35 bags (25kg) or 22 bags (40kg). Add 5-10% extra for outdoor projects as uneven ground may require additional concrete. UK building control requires minimum 150mm thickness for exterior concrete stairs. Our stairs calculator shows exact bag requirements for 20kg, 25kg, and 40kg sizes, helping you choose the most cost-effective option for your outdoor staircase, patio steps, or garden stairway project.

Standard UK stair dimensions for residential stairs calculator projects: Riser height: 150-220mm (170mm typical), Tread depth: 220-300mm (250mm typical), Stair width: 800-1000mm (900mm common), Step thickness: 150-200mm for concrete. Commercial stairs have different requirements: minimum 1200mm width, maximum 190mm risers. For outdoor garden steps: wider and shallower is safer (200mm risers, 350mm treads). Handrail height: 900-1000mm above pitch line. When planning stair lift cost calculator requirements or carpet measurements, these dimensions are critical. Use our calculator to input your specific stair dimensions and get accurate concrete volume, whether building new stairs, replacing worn steps, or creating accessible entrance ramps.

UK concrete costs for stairs typically range from £80-£150 per cubic metre depending on supplier and location. A standard 8-step outdoor staircase (0.5m³) costs approximately £40-£75 in concrete materials plus delivery. Breakdown: 40 bags (25kg) at £4.50 each = £180, or bulk delivery 0.5m³ at £100 = £100 saving £80. Labour costs: professional installation ranges £200-£500 depending on complexity, formwork requirements, and access. Total project including materials and installation: £300-£650 for typical garden stairs. Compare this to stair lift cost which averages £2000-£5000 for indoor installations. Our stairs calculator provides instant cost estimates based on current UK concrete prices, helping you budget accurately for outdoor steps, patio stairs, or garden stairways.

Yes, outdoor concrete stairs require steel reinforcement mesh or rebar for durability and safety. Standard reinforcement for stairs: A142 or A193 mesh laid 50mm from top surface, or 10mm rebar grid at 200mm centres both ways. For stairs with spans over 1.5m or heavy traffic areas, use heavier reinforcement (A252 mesh or 12mm rebar). Garden steps may use lighter reinforcement (A98 mesh) for decorative applications. UK Building Regulations require adequate reinforcement for all structural stairs. Position mesh or rebar before pouring concrete, supported on spacers to maintain correct cover. Always check local building control requirements for your stair project. Our calculator provides concrete volume only - consult structural engineer for reinforcement specifications.