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Evaluate tap-target dimensions for accessible mobile interaction. This tool helps reduce touch errors by checking control size against baseline and usability-focused targets.
Last updated: April 15, 2026
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Smallest Side (Physical Size)
3.43 mm
Recommended Minimum
44px
WCAG Baseline Status
Pass
Target size is strong for the selected context and supports reliable touch interaction.
Pair target size checks with spacing and gesture testing on real devices.
We can build and embed a custom version of Touchscreen Tap Target Size Calculator for your brand and workflow.
Uses the smaller target side to determine practical touch accessibility performance.
Converts pixel dimensions to millimeters for device-independent interpretation.
Suggests larger minimums for higher-accessibility and lower-precision interaction contexts.
A 44x44 px target on a 326 PPI screen generally meets baseline touch accessibility and often maps to around 3.4 mm on its smallest side.
Target Size
44 px
Physical Size
~3.43 mm
Baseline Status
Pass
This model checks minimum target dimension, converts pixel size to physical measurement, and compares values against practical accessibility-focused thresholds for different user contexts.
Inputs: Target width/height + screen PPI + user contextOutput: Physical size, baseline pass/fail, and recommended minimumPurpose: Reduce touch error risk and improve mobile accessibilityPair tap-target sizing checks with contrast and text readability validation for more inclusive mobile UI.
Explore Accessibility & Ergonomics CalculatorsResult: Baseline may pass while accessibility-priority recommendations still suggest increasing target size.
Incremental size gains often produce measurable tap-accuracy improvements.
Share it with mobile teams improving tap accuracy and touch accessibility.
Suggested hashtags: #Accessibility #MobileUX #TouchTargets #InclusiveDesign #WCAG