TBR Backlog Estimator
Enter how many unread books you have, their average length, how fast you read, and how many new books you add each month, and see how long the pile takes to clear — or whether it ever does.
The pile that grows while you read
Every reader knows the quiet arithmetic of the TBR: one bought in a moment, one finished over a week. This tool makes that arithmetic explicit. By pitting your reading pace against your buying habit, it shows whether the stack on your nightstand is slowly clearing, holding steady, or quietly taking over the house.
Set a realistic reading rate with the Books-Per-Year Goal Planner, and size up any single title with the Reading Time Calculator.
Frequently Asked Questions
What is a TBR pile?
TBR stands for "to be read" — the stack of books you own or have marked to read but have not started yet. For a lot of readers it grows faster than it shrinks, because buying a book takes a minute and reading it takes days. This estimator tells you, at your current pace and buying habit, how long the pile would take to clear.
How does it work out the time to clear?
It converts your daily reading pace into books finished per month using your average book length, then subtracts the new books you add each month to get a net rate. The unread count divided by that net rate is the number of months to clear, which it also turns into a finish date. If you add books at least as fast as you finish them, the pile never clears and the tool says so.
Why does it say my pile will never clear?
Because you entered a buying rate equal to or higher than your reading rate. If you finish three books a month but buy four, the backlog only grows. The fix is either to read a little more each day or to slow the incoming books — nudge either input and watch the outlook flip from "never" to a real date.
Should I try to clear my TBR at all?
Not necessarily. Many readers treat a large TBR as a well-stocked personal library rather than a debt to pay off, and there is nothing wrong with that. The estimator is there to give you a realistic picture — whether you use it to set a reading goal, to justify a book-buying ban, or just to smile at how many good books are waiting is up to you.
Educational estimate. It assumes a steady pace and a constant buying rate — real reading and real book-buying both come in waves, so use the finish date as a guide.