The essential dimensions behind good design.
A clear, visual reference for the clearances, heights, and widths that shape architecture, interiors, accessible design, furniture, and landscapes — built for designers of every trade.
Browse by category
Architecture
Core building dimensions: doors, stairs, corridors, ceilings, and structural clearances.
Browse categoryInterior Design
Room layouts, furniture clearances, and spatial planning guidance for livable interiors.
Browse categoryAccessibility & Universal Design
ADA and universal design standards: clear widths, reach ranges, turning space, and ramps.
Browse categoryErgonomics & Furniture
Human-scale and furniture dimensions: desks, seating, reach zones, and body clearances.
Browse categoryLandscape & Site
Site planning dimensions: parking, walkways, planting, and exterior circulation.
Browse categoryGuides
Frequently referenced
View all →Interior Door Clear Width
ArchitectureMinimum clear opening width for a standard interior passage door.
Wheelchair Turning Space (360°)
AccessibilityMinimum floor space for a wheelchair to make a complete turn, as a circle or T-shaped space.
Kitchen Counter Height
InteriorStandard finished height of a kitchen countertop above the floor.
Stair Riser & Tread Dimensions
ArchitectureStandard riser height and tread depth for comfortable, code-compliant stairs.
Standard Desk Height
ErgonomicsFixed-height work surface for seated desk work, matched to an average-height adult.
Ramp Running Slope
AccessibilityMaximum running slope for an accessible ramp, expressed as a rise-to-run ratio.
Built for every design trade
Architects, interior designers, landscape architects, product and furniture designers, and accessibility consultants all rely on the same underlying human-scale dimensions. This library brings those references together in one consistent, searchable place.
Read about our sources & methodology →