Days of Supply Calculator — free online
Running a small shop or warehouse, the scary moment is realizing too late that you're almost out of something. By then it's a rush order or an empty shelf. We added a free tool that does the math for you — Days of Supply Calculator — right in your browser.
What it does
You type in how much stock you have on hand and your average daily usage. It tells you exactly how many days of inventory are left and the day you'll run out. That's it — no spreadsheets, no formulas to remember.
Nothing leaves your device
The whole thing runs in your browser. Your numbers stay on your screen. Nothing is uploaded, nothing is saved on a server, and there's no account to make. Close the tab and it's gone.
How to use it
- Open Days of Supply Calculator and enter your current stock on hand.
- Enter your average daily usage.
- Read off how many days you have left and your run-out date.
It's free with no limit. There are more small tools on the Apps page.