Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. In the first example the result is 56.0 hours.
The calculator is not an eye diagnosis and does not measure a refractive error. Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours.
Enter data and click Calculate.
The calculator uses the numbers you enter. Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. In the first example the result is 56.0 hours.
The five form fields are Screen time, Not wearing needed glasses/contacts, Dry eye / burning, Poor lighting ergonomics, and 20/20/20 break compliance. Weekly screen time means: This is the main result on this page. In the first example it is 56.0 hours. Screen time means: The first form field. It enters the formula or sits beside the result. Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. Not wearing needed glasses/contacts means: The second form field. The calculator is not an eye diagnosis and does not measure a refractive error.
The second example gives 84.0 hours. The third example gives 28.0 hours. Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. In the first example the result is 56.0 hours.
The calculator is not an eye diagnosis and does not measure a refractive error.
Enter 8, 0, 4, 3, 6, then click Calculate. A comma in 12.5 is read the same way as a period. Fields on a 0-10 scale are notes and are not the primary result unless this page formula says so.
Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours.
In the first example the result is 56.0 hours. Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours.
56.0 hours
Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. In the first example the result is 56.0 hours.
84.0 hours
Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. In the second example the result is 84.0 hours.
28.0 hours
Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. In the third example the result is 28.0 hours.
In the first example the result is 56.0 hours. Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours.
With the second set of fields the result is 84.0 hours.
With the third set of fields the result is 28.0 hours.
Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours.
The calculator is not an eye diagnosis and does not measure a refractive error.
This is the main result on this page. In the first example it is 56.0 hours. The first form field. It enters the formula or sits beside the result. Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. The second form field. The calculator is not an eye diagnosis and does not measure a refractive error.
Yes. 12.5 and 12,5 are read the same way.
No. Fields on a 0-10 scale are notes, unless this page formula counts marked items from them. The primary result comes from this page formula.
Daily hours × 7. At 8 h a day the result is 56 h a week. Glasses and 20-20-20 sit beside that total.
No. The calculator does not measure a refractive error and does not make a diagnosis.
No. Dryness, lighting, and 20-20-20 are notes beside weekly screen time.
No. The formula multiplies one day by 7. Enter a typical day, not a weekend sum.
It is a break note, not a separate result. The main result stays daily screen hours × 7.
Weekly screen time is daily hours × 7. Glasses, dryness, lighting, and 20-20-20 sit beside those hours. The calculator is not an eye diagnosis and does not measure a refractive error.
Page updated in 2026.
