When Was the Last Time You Saw a Tree?
If your last unprompted thought referenced a niche meme template, you've gotten in three online debates this week, and your only daylight today came from walking to the kitchen, your brain may be running a little hot.
This calculator scores how online you've been and prescribes a minimum number of outdoor minutes to bring you back to baseline.
What This Calculator Does
You enter today's screen time, this week's online debate count, today's caffeine intake, and how many minutes of daylight you've actually had. The calculator weights those into a composite "online saturation" score and converts that into a required minimum number of outdoor minutes plus a specific recommended activity.
Bigger composite score, bigger prescription. Daylight already received reduces it.
How to Use This Calculator
Daily screen time. Total active screen hours today. Phone screen-time reports plus laptop estimate.
Online debates this week. Anything you typed an opinion into, comment thread or DM. Reading without engaging doesn't count.
Caffeine cups today. Standard 8-ounce cups of coffee, or strong tea / energy drinks weighted as one cup each.
Daylight minutes today. Time spent in actual outdoor light without a screen. Walking the dog counts. Looking out a window does not.
The Formula Behind the Math
score = screen_hours * 6
+ debates * 8
+ caffeine_cups * 3
- daylight_minutes * 0.5
grass_minutes = max(15, score)
For a baseline of 9 screen hours, 3 debates, 4 cups of caffeine, and 15 daylight minutes:
The 15-minute floor exists because every brain owes nature at least that much per day, regardless of input.
Tips and Things to Watch Out For
Walking with podcasts is a half-credit. You're outside but your attention isn't. Take at least one daily walk with no audio.
Window-side desks are not outdoor time. Sunlight through glass is filtered, attenuated, and indistinguishable from screen light to the brain's circadian system.
Argument count is a real signal. Engaging in three or more online disagreements in a week correlates with sleep disruption, doomscroll patterns, and reduced focus the following day.
The recommended activity matters. A walk and a park bench are not interchangeable. The bench is the cure.
Frequently Asked Questions
Is "touch grass" actually grounded in research?
Time outdoors and time in green space are linked to lower cortisol, better mood, and improved attention in dozens of peer-reviewed studies. The phrase is internet-shorthand. The mechanism is real.
How long should I be outdoors per day?
A reasonable health floor is 20 to 30 minutes of outdoor exposure per day with at least 10 of those in direct sunlight. This calculator scales that based on how online your day was.
What if I work from home?
The prescription gets bigger, not smaller. Remote work eliminates most of the incidental walking and daylight that office life provided. Add 15 minutes to the result if you haven't left your apartment in 24 hours.
What if it's raining?
Rain still counts. Cloud cover halves the lux but the brain still gets the daylight signal it needs.