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Use this calculator to estimate primary, secondary, and maximum reach zones for desk or bench layouts. Better reach zoning can reduce shoulder load, improve flow, and support healthier repetitive work patterns.
Last updated: April 7, 2026
Need complete workstation optimization? Explore this category
Primary Reach Zone
14.3 in
Secondary Reach Zone
20.8 in
Maximum Reach
27.6 in
Keep keyboard, mouse, and frequently used controls within the primary reach zone.
Move high-frequency tools into primary reach to reduce shoulder load.
We can build and embed a custom version of Ergonomic Workspace Reach Zone Calculator for your brand and workflow.
Reserve for continuous-use items like keyboard, mouse, and core controls.
Place supporting tools that are needed often but not constantly.
Store low-frequency items here to avoid repeated high-load movements.
For arm length 26 in and torso allowance 8 in (typing): primary ~14.3 in, secondary ~20.8 in, max ~27.6 in.
Primary
14.3 in
Secondary
20.8 in
Maximum
27.6 in
The model estimates zones from arm length and task intensity. Primary reach is conservative for frequent actions, while secondary and maximum zones provide planning boundaries for less frequent access.
Primary Reach: Arm Length x task factorSecondary Reach: Arm Length x 0.8Maximum Reach: Arm Length + torso allowance adjustmentUse this with chair, keyboard, and monitor calculators to build a complete ergonomic workstation system.
Explore Accessibility & Ergonomics CalculatorsResult: Core tools in primary zone, supporting tools in secondary, rare items at maximum reach.
Re-check after adding new peripherals or changing desk depth.
Share it with colleagues designing lower-strain, higher-efficiency workstations.
Suggested hashtags: #Ergonomics #WorkspaceDesign #ReachZone #Productivity #Accessibility