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Estimate screen magnification ratio and zoom percentage to support low-vision readability. Use this calculator to compare baseline and target text sizes, review effective viewing distance, and plan more inclusive digital experiences.
Last updated: April 7, 2026
Looking for related tools? Explore accessibility calculators
Magnification Ratio
1.5x
Zoom Percent
150%
Effective Distance
40 cm
Balanced magnification range for many low-vision workflows.
Validate final settings with user testing, reflow checks, and preferred assistive tools.
We can build and embed a custom version of Screen Magnification Ratio Calculator for your brand and workflow.
Converts baseline and target text size values into magnification ratio and zoom percentage.
Uses viewing distance to estimate readability comfort and provide practical low-vision support context.
Offers actionable recommendations before validating final settings with users and assistive tools.
Increasing base text from 16px to 24px results in about 1.5x magnification (150%), a common range for low-vision readability improvements.
Ratio
1.5x
Zoom
150%
View Distance Effect
Improved
The calculator compares target visual text size to the baseline size to produce a magnification ratio. That ratio is then translated into zoom percentage and combined with viewing distance context.
Magnification Ratio: Target Font Size / Base Font SizeZoom Percent: Magnification Ratio x 100Effective Distance: Adjusted by ratio and support levelResult: 1.5x magnification (150%) with stronger readability while preserving workable interface context.
Help teams improve low-vision accessibility with practical magnification planning.
Suggested hashtags: #Accessibility #LowVision #Magnification #InclusiveDesign #UX