Example 1
- screen 3 h
- limit 2 h
- breaks 4
- break 5 min
- daylight 20 min
4.7 hours over
4 × 5 ÷ 60 = 0.3. 3 − 0.3 = 2.7. 2.7 × 7 = 18.7. 2 × 7 = 14. 18.7 − 14 = 4.7 hours over.
Non-work screen time
The calculator uses the numbers you enter: non-work screen hours, the daily limit, and breaks. 3 hours minus 4 breaks of 5 minutes is 18.7 hours in a week. A 14-hour limit is 4.7 hours over. Daylight sits in the grid.
The limit is the number you enter, not a medical dose. The calculator does not diagnose vision and does not measure the screen. Sleep shortfall is optional and does not change the main result. Tidy-up: time to clear digital clutter.
Results
Enter data and click Calculate.
How it works
The calculator subtracts break time from daily non-work screen hours, multiplies the remainder by 7, then subtracts that remainder from the limit times 7. 3 minus 4 × 5 ÷ 60 is 2.7. 2.7 × 7 = 18.7. 2 × 7 = 14. 14 − 18.7 = −4.7, which is 4.7 hours over.
The main result comes from screen hours, the limit, the number of breaks, and minutes per break. Daylight and sleep shortfall are optional and do not change the main result.
Second example: 1.5 hours minus 6 breaks of 5 minutes and a limit of 2 is 7 hours under. Third: 4 hours minus 2 breaks of 15 minutes and a limit of 2 is 10.5 hours over.
The limit is the number you enter, not a medical dose. The calculator does not diagnose vision. A comma in 12.5 is read the same way as a period.
Formula
Result = (limit − time after breaks) × 7. At 2 and 2.7: (2 − 2.7) × 7 = −4.7. Daylight sits in the grid.
What these numbers mean
3 hours minus 4 breaks of 5 minutes and a limit of 2 is 4.7 hours over.
- time after breaks
- Screen hours minus breaks, then times 7. At 3 hours and 4 breaks of 5 minutes that is 2.7 a day and 18.7 in a week.
- weekly limit
- The daily limit times 7. At 2 hours that is 14 in a week. It is the number you enter, not a medical dose.
- daylight
- Minutes outdoors times 7. They sit in the grid and do not change spare time or hours over the limit.
How to use
- Enter 3 screen hours and a limit of 2.
- Add 4 breaks of 5 minutes.
- Click Calculate. The result is 4.7 hours over.
- Second example: 1.5, 2, 6, 5 and 45 is 7 hours under. Third: 4, 2, 2, 15 and 10 is 10.5 hours over.
- You can skip daylight and sleep shortfall. When you fill those fields, they appear in the grid and do not change the main result.
Examples
Example 2
- screen 1.5 h
- limit 2 h
- breaks 6
- break 5 min
- daylight 45 min
7 hours under
6 × 5 ÷ 60 = 0.5. 1.5 − 0.5 = 1. 1 × 7 = 7. 2 × 7 = 14. 14 − 7 = 7 hours under.
Example 3
- screen 4 h
- limit 2 h
- breaks 2
- break 15 min
- daylight 10 min
10.5 hours over
2 × 15 ÷ 60 = 0.5. 4 − 0.5 = 3.5. 3.5 × 7 = 24.5. 2 × 7 = 14. 24.5 − 14 = 10.5 hours over.
Related calculators
Common questions
What does 4.7 hours over mean?
4 × 5 ÷ 60 = 0.3. 3 − 0.3 = 2.7. 2.7 × 7 = 18.7. 2 × 7 = 14. 18.7 − 14 = 4.7 hours over.
How is the result calculated?
Result = (limit − time after breaks) × 7. At 2 and 2.7: (2 − 2.7) × 7 = −4.7.
What is the second example?
1.5 hours minus 6 breaks of 5 minutes and a limit of 2 is 7 hours under.
What is the third example?
4 hours minus 2 breaks of 15 minutes and a limit of 2 is 10.5 hours over.
What does the calculator not do?
The calculator does not diagnose vision and does not measure the screen. The limit is not a medical dose. Sleep shortfall is optional.
Do all fields enter the main result?
No. The main result comes from screen hours, the limit, the number of breaks, and minutes per break. Daylight and sleep shortfall are optional.
What do time after breaks, weekly limit, and daylight mean?
Time after breaks is screen hours minus breaks, then times 7. The weekly limit is the daily limit times 7. Daylight is minutes outdoors times 7, in the grid.
Does a comma in 12.5 work?
Yes. 12.5 and 12,5 are read the same way.
Sources
The result comes from the numbers you enter. This is spare time or hours over the limit, not a vision diagnosis.
Page updated in 2026.