Eye Break Calculator
Turn screen minutes into 20-20-20 breaks with total rest seconds and minutes.
What it does
Long screen stretches tire eyes because focus stays near and blinking drops. The 20-20-20 rule breaks that lock: every 20 minutes look about 20 feet away for 20 seconds.
The tool above takes screen minutes. It returns break count, rest seconds, and rest minutes, so 120 minutes reads as 6 breaks giving 120 seconds or 2 minutes of distance rest.
This math counts scheduled breaks only. It does not fix lighting glare, wrong viewing distance, outdated prescriptions, or dry air, which need their own changes.
Eye guidance frames the same rule: for every 20 minutes of computer viewing look into the distance for 20 seconds, with screens 20 to 28 inches away and rest after long stretches.
Set a timer rather than willpower. Six quiet 20 second glances beat one long rub at the end of the day.
How to use
- Enter continuous screen minutes planned.
- Read breaks needed first for the timer count.
- Read rest seconds for the rule total.
- Read rest minutes for the calendar feel.
- Look 20 feet away for each 20 second break.
- Blink often and adjust glare beside breaks.
Formula
- screen
- Continuous screen minutes in the stretch.
- breaks
- Whole 20 minute blocks completed.
- rest
- Distance viewing seconds earned.
Floors give whole breaks only. Shorter than 20 minutes gives zero breaks. The 20 feet distance and 20 second length are fixed by the rule.
Worked example
Example: 120 screen minutes
Screen minutes 120 in one stretch.
- Breaks: floor(120 / 20) = 6 breaks.
- Rest: 6 x 20 = 120 sec.
- Minutes: 120 / 60 = 2 min.
- Tool shows 6 breaks, 120 sec, 2 min.
- Plan: six 20 second glances across the two hours.
Reference table
| Screen time | Breaks | Rest |
|---|---|---|
| 60 min | 3 breaks | 60 sec |
| 120 min | 6 breaks | 120 sec |
| 240 min | 12 breaks | 240 sec |
Limits
- Counts only. Lighting and prescription still matter.
- Assumes continuous viewing without natural pauses.
- Meetings and calls without screens pause the count.
- Symptoms lasting past rest need an eye exam.
Common mistakes
- Banking breaks for one long rest at day end.
- Looking at a phone across the room as distance.
- Counting under 20 minute stretches as full breaks.
- Skipping blinks during the 20 seconds.
- Keeping glare that no break schedule fixes.
Try it yourself
Quick checks. Answers sit tucked under each question.
60 screen minutes?
3 breaks, 60 sec, 1 min of rest.
25 screen minutes?
1 breaks, 20 sec, 0.3 min of rest.
200 screen minutes?
10 breaks, 200 sec, 3.3 min of rest.
Questions
What is the 20-20-20 rule?
Every 20 minutes look 20 feet away for 20 seconds to relax focus.
How many breaks do I need?
Screen minutes divided by 20, rounded down. 120 minutes give 6 breaks.
How much rest is that?
Breaks times 20 seconds. 6 breaks give 120 seconds or 2 minutes.
What counts as distance?
About 20 feet away, like across the room or out a window.
Do phones count as breaks?
No. Rest means distance viewing, not a nearer small screen.
When should I see a doctor?
When strain, blur, or headaches persist past rest and habit fixes.