Multi-Screen Usage Calculator
When two screens run at once, real exposure is higher than any single device report.
Running two screens at once means 5.5 wall-clock hours produce 8.5 hours of actual exposure — three hidden hours that no single device report will ever show.
Multi-Screen Usage Calculator
Frequently asked
Is the Multi-Screen Usage Calculator free?
Yes. Every tool on AlphaBetaMinds is free, needs no account and has no usage limit.
Does this tool store what I type?
No. It runs entirely in your browser. Your inputs are never sent to our server, and nothing is logged.
How accurate is it?
It uses the McCrindle generation boundaries (Gen Alpha 2010–2024, Gen Beta 2025–2039) and UN World Population Prospects vital rates. Sources and formulas are on our methodology page.
Can I use the result in an article or report?
Yes, with a credit and a link back to this page. See our terms of use for the full licence.
More screen time & digital life
School Phone Rules by Canadian Province
Every Canadian province and territory's rule on cellphones in school: class time or…
Scroll Cost Calculator
What scrolling costs in hours, sleep and opportunity over a year — converted…
Notification-Free Hours
Which hours to make notification-free, and what that actually returns in focused time.
Co-Viewing Time Tracker
Time spent watching with a child rather than near them — the strongest…
How Screen-Aware Are You?
Ten questions on what is actually happening on your household devices.
Device-Free Mealtime Tracker
The household rule with the best ratio of compliance to benefit — measured…
Smartphone Lifetime Calculator
From a first phone at a given age, total hours on it by…
First Thing, Last Thing Audit
Whether a screen is the first and last thing in a child's day…