Accessibility Calculators
Wheelchair ramps, accessible WCs, door widths, corridors and Part M accessibility calculators for UK buildings.
Accessible Parking Calculator
Calculate accessible parking bay dimensions, hatching and signage per BS 8300.
Accessible WC Calculator
Check wheelchair-accessible toilet layout against Doc M and BS 8300 requirements.
Corridor Width Calculator
Calculate corridor widths for wheelchair access and passing places per Part M.
Door Width Calculator
Calculate effective clear door widths for wheelchair access per Approved Document M.
Handrail Calculator
Calculate handrail lengths, heights and extensions for stairs and ramps per Part M and BS 8300.
Hearing Loop Calculator
Calculate hearing loop cable length, amplifier power and coverage area for accessible venues.
Level Threshold Calculator
Calculate level access door threshold details to meet Part M wheelchair accessibility requirements.
Lift Sizing Calculator
Calculate passenger lift car dimensions and shaft size for wheelchair access per Part M.
Tactile Paving Calculator
Calculate tactile paving blister and corduroy surface quantities for crossings and hazard warnings.
Wheelchair Ramp Calculator
Calculate ramp length, gradient, landings and handrails per Part M and BS 8300.
10 free calculators in Accessibility
Accessibility Requirements in UK Construction
Approved Document M of the UK Building Regulations sets out accessibility requirements for all new buildings and alterations. It covers level access thresholds, door widths, corridor widths, ramp gradients, WC provisions and lift access. BS 8300 (Design of an accessible and inclusive built environment) provides more detailed design guidance that goes beyond the minimum regulatory requirements. Our accessibility calculators help architects, builders and access consultants design compliant spaces.
Wheelchair ramps must have a maximum gradient of 1:12 for ramps up to 2m long, 1:15 for ramps up to 5m, and 1:20 for ramps up to 10m. Level landings of at least 1.2m × 1.2m are required at the top and bottom, and at every 2m of vertical rise. Our wheelchair ramp calculator computes the ramp length, number of landings, and handrail requirements based on the level change.
Accessible WCs (Doc M packs) require a minimum room size of 1500mm × 2200mm with specific fixture positions: the WC at 500mm from the side wall, grab rails at 680mm height, and a minimum 1500mm turning circle for wheelchair users. The accessible WC calculator checks your proposed layout against these dimensions.
Door widths for wheelchair access require a minimum 800mm clear opening width (achieved with a 926mm door leaf in a standard frame). Corridors serving accessible rooms should be at least 1200mm wide, with 1800mm × 1800mm passing places at intervals not exceeding 12m. These requirements apply to all new non-domestic buildings and common areas of residential developments.