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tool.font-size-readability Calculator
Calculates the minimum readable font size at a given viewing distance using the visual acuity threshold of 1/60° per letter stroke. At a standard 40 cm reading distance, 9 pt is the practical minimum — at 3 metres (presentation screen), the minimum is 18 pt.
Inputs
Viewing Distance In
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Visual Angle Arcmin
Reference formula or conversion factor shown for context.
Screen Ppi
Reference formula or conversion factor shown for context.
Scale Factor
A multiplier applied in the calculation.
Results
recommended font size (px)
Sample size or count used in the calculation.
font height (inches)
The computed height.
typical minimum
The smallest value in the dataset or feasible range.
WCAG AA
Reference formula or conversion factor shown for context.
screen PPI
Sample size or count used in the calculation.
CSS pt ≈ px
Reference formula or conversion factor shown for context.