For self-storage operators
A free 3D size calculator for your storage website
Your visitors pick what they're storing. It packs it, to scale, into your unit sizes, shows the smallest one that takes it all, and sends them to your booking page for that size.
- Price
- Free, for every page and location
- Setup
- One snippet, about five minutes. No account
- Yours
- Your sizes, ceilings, booking links and colour
- Items
- 50 pieces of real furniture, appliances and boxes, all in 3D
- Works on
- WordPress, Wix, Squarespace, Webflow, plain HTML
This is the real calculator, with the common US sizes. Set it up for your own units below and it changes here as you type.
Set it up for your facility
Fill in what you can. Everything except your unit sizes is optional, and the code below updates as you go.
Paste it where the calculator should appear, usually your size guide or units page. Step-by-step for WordPress, Wix, Squarespace and others →
Your site won't run scripts?
Use this frame-only version instead. It does the same, without the events.
What your visitors see
A storage unit in your sizes, with their things packed into it: sofas, mattresses on edge, boxes stacked to the ceiling, a person by the door for scale. They start from a home size (studio to 4‑bedroom) or add things one at a time, and the answer updates as they go.
Every size you offer gets a plain line: fits, 63% full, or 26 of 46 fit. The best fit is the smallest unit that holds everything with room to walk in, so you aren't upselling and they aren't coming back for a second unit.
How the sizes are worked out
It's the same packing engine as our moving-truck planner. Furniture sizes come from real products, items are turned the way movers turn them (mattresses on edge, tables taken apart), and nothing heavy goes on top of anything fragile. If you give a door size, big items are checked against it too. Real packing always leaves gaps, and the calculator says so.
Questions operators ask
Is it really free?
Yes, for any number of pages and locations. In return, the calculator keeps a small "Size check by Every Last Box" line and a link back to us. That link is how other operators find it.
Can I remove the credit, or add my own items?
Not in the free version. We're planning a paid version without the credit, with your own item list and logo. If you'd want that, write to contact@everylastbox.comwith your facility's website. It tells us whether to build it.
Does it collect anything about my visitors?
No names, emails or cookies. The calculator runs in the visitor's browser. What they pick isn't sent to us, and it isn't sent to you either unless you listen for its events (see the install guide). Our host counts page loads without cookies, as described on our privacy page.
Will it slow my site down?
No. It runs in its own frame and only loads once a visitor scrolls near it. The rest of your page loads as if it weren't there.
Do I need an account, or to tell you I've installed it?
No account and no sign-up. If you'd like to hear when we add something, email us and we'll let you know.
My units aren't standard sizes. Will that work?
Yes. Use any width and depth from 3 to 50 feet (or 0.9 to 15 metres), and a ceiling for each unit if they differ. Units like a 7.5x10 work fine.