Zen Inbox Cleaner
The Inbox Time-Cost Calculator
Last reviewed: August 30, 2026 · Markdown version
How much of your year goes to email you never wanted? Choose your numbers — every assumption is yours to set.
Runs entirely in your browser — no form submission, no network request, nothing stored.
The formula, and every assumption in it
Nothing is measured for you and nothing is guessed on your behalf — the three inputs are the three assumptions, and they are all yours. With perDay = emails received per day, pct = the unwanted share, and secs = seconds each unwanted email steals:
unwantedPerYear = perDay × 365 × pct
secondsPerYear = unwantedPerYear × secs
hoursPerYear = secondsPerYear ÷ 3600
workWeeks = hoursPerYear ÷ 40 (shown only at 40 hours or more)Worked example: 100 emails a day, half of them unwanted, 5 seconds each is 100 × 365 × 0.5 = 18,250 unwanted emails a year, × 5 = 91,250 seconds — ≈ 25.3 hours. At 200 a day, 75% unwanted, 10 seconds each: 54,750 emails, 547,500 seconds, ≈ 152.1 hours — about 3.8 work-weeks.
The presets offered are 20 · 50 · 100 · 200 emails a day; a quarter, half, or most of it unwanted; and 2, 5, or 10 seconds each. A work-week is 40 hours. A year is 365 days — every day, because unwanted mail does not take weekends.
| Hours per year | What we make of it |
|---|---|
| Under 10 | Barely a dent. Guard it anyway. |
| 10–39 | A full workday or more, every year, on mail you never asked for. |
| 40–99 | That's ≥ a work-week a year of deleting and scrolling. |
| 100 and up | Weeks of your year. The unsubscribe button is a raise. |
This is an estimate, nothing more. It counts the time you spend handling unwanted mail — glancing, swiping, hunting an unsubscribe link — not the time it takes to get back to what you were doing. Storage is a different question: for that, try the Email Hoarder Calculator or the one-minute storage diagnosis.
Get those hours back.
Zen Inbox Cleaner groups your Gmail inbox by sender, so you can trash bulk mail, newsletters, and promotions in one tap — and unsubscribe with one tap. It reads email metadata only (never bodies or attachments), everything happens on your device, and nothing is permanently deleted by the app — trashed email stays recoverable in Gmail's Trash for 30 days.
Its auto-trash rules are native Gmail filters — they run inside Gmail itself, so the flood stays stopped.