Web app · Business
DimShave: Ship Smaller
See the dimensional-weight penalty before you print a label — the 2026 USPS math, in your browser
Enter an item's L × W × H and weight; DimShave picks the smallest box it fits from a 13-box catalog plus your own, shows the 139-divisor math with whole-inch rounding, billable vs actual pounds, compares USPS, UPS and FedEx, and logs every shipment with a running DIM tally. Free, no install.
Stored in your browser only. Nothing you do in the web version is sent to our servers. Clear your browser data and it's gone — so export a backup from the in-app menu if you want to keep it.
This app is a community proposal.
Try the full browser version now. We build the iPhone and Android app once 100 people upvote it.
We'll email you once, when it ships. Unsubscribe anytime.
In your browser
What you can do in DimShave: Ship Smaller on the web
Smallest compliant box
Every box the item fits in any orientation, sorted by volume, with the smallest highlighted and whether it stays under the 1,728 cu-in line.
Full 2026 DIM math
⌈L⌉ × ⌈W⌉ × ⌈H⌉ ÷ 139 laid out step by step, with what the old 166 divisor would have billed.
Billable vs actual
Whole-pound billable weight next to actual weight, with the DIM penalty called out in pounds and dollars.
USPS / UPS / FedEx comparison
Illustrative Ground rate cards ranked cheapest-first at your billable weight, with the recommended fill for the empty space.
Shipment log
Every saved box choice with billable weight, DIM penalty, carrier and estimated cost, plus DIM pounds per week and CSV export.
Your own boxes
Add the boxes you actually keep on hand; they join the bundled catalog in the smallest-fit search.
Screens
Every screen, rebuilt for the browser
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1
Measure
Item name, L × W × H and weight sliders, quick samples, and a live recommended-box preview.
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2
Best box
The recommended box with the threshold gauge, DIM math, billable vs actual, other fitting boxes and Save to shipments.
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3
Carriers
USPS, UPS and FedEx estimates at your billable weight, cheapest first, with recommended fill.
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4
Shipments
Count, boxes under 1 cu ft, total DIM pounds, DIM per week and the full log.
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5
Shipment detail
Measured size, box, actual and billable weight, carrier, cost and the box's threshold gauge.
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6
Boxes
Your own boxes and the 13-box bundled catalog, green under the threshold and red over it.
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7
Settings
The current USPS rule, catalog, backup and CSV export, sample data, erase and disclaimer.
Try it with sample data: Adds twelve logged shipments from the last five weeks (mug, hoodie, book, sneakers, board game, lamp and more) computed through the same engine, plus a custom Sneaker box. You can start fresh at any time.
Ready? It's free.
No account, no install, no subscription. Everything you do stays in this browser.
Your say
What should DimShave: Ship Smaller do? Tell us before we build it.
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Questions
Is the web version of DimShave: Ship Smaller free?+
Yes. Every screen is free to use: no subscription, no in-app purchases, no account.
Do I need an account?+
No. Open DimShave: Ship Smaller and start using it right away. Sign in with Google only if you want to upvote an app, save it to your list, or leave a comment.
Where is my data stored?+
Only in this browser's local storage. Nothing you enter is sent to our servers, so we can't see it, back it up, or restore it. Clearing site data, a private window, or another device starts empty. Export a backup from the in-app menu to keep it.
Is there a DimShave: Ship Smaller app for iPhone or Android?+
Not yet. DimShave: Ship Smaller is a community proposal: the browser version is complete, and we build the iPhone and Android app once 100 people upvote it. Upvoters get one email when it ships.