Vision Display Terminal Calculator

Screen distance and height from workstation assessment.

Screen distance (cm)

Screen top relative to eyes (cm)

Screen diagonal (inches)

Daily screen hours

Tab to move between fields

Eye strain risk (0-100)

Viewing angle (degrees)4.8

Optimal distance (cm)73

Min font size (pt)1

20-20-20 breaks/day24

Adjustments needed0

How to Use This Calculator

Enter screen distance (cm), screen top height relative to eye level (cm), and screen diagonal size (inches).
Enter daily screen hours.
Read eye strain risk score (0-100) based on the 20-20-20 rule and VDT ergonomic standards.
Review recommended screen height and distance adjustments to reduce digital eye strain.
Implement the 20-20-20 rule: every 20 minutes, look 20 feet away for 20 seconds.

How the result changes with Daily screen hours

Screen distance (cm): Distance from eyes to screen center.
Screen top relative to eyes (cm): Height of screen top relative to eye level (positive = above eyes).
Screen diagonal (inches): Monitor diagonal screen size in inches.
Daily screen hours: Hours per day spent looking at screen.

Eye strain risk (0-100): Composite digital eye strain risk score.
Viewing angle (degrees): Angle from horizontal to screen center (negative = below).
Optimal distance (cm): Recommended viewing distance for this screen size.
Min font size (pt): Minimum recommended font size for comfortable reading.
20-20-20 breaks/day: Number of 20-20-20 rule breaks needed per day.
Adjustments needed: Number of workstation adjustments recommended.

Identify Input Parameters
4 parameters
Screen distance (cm) = 60, Screen top relative to eyes (cm) = 5, Screen diagonal (inches) = 24, Daily screen hours = 8 = 4 input(s) provided
Calculate Eye strain risk
Eye strain risk
16 = 16
Calculate Viewing angle
Viewing angle
4.8 = 4.8
Calculate Optimal distance
Optimal distance
73 = 73