1. Package
2. Estimate
3. Carrier profiles
Divisors are prefilled from the carriers' own published pages (see “Sources” below). Rates are never prefilled: paste your own rate card (from your account, label provider, or a public chart you are allowed to use). One line per weight break: pounds,price. Use 0.25 for 4 oz.
Free includes up to 3 profiles. Pro lifts the limit.
4. Batch: many packages from a CSV Pro
Columns (header row, any order): sku, length, width, height, weight. Uses the units chosen above. The file is read locally; nothing is uploaded.
Dimloom Pro
Free
- Single-package estimate
- Up to 3 carrier profiles
- Editable divisors, surcharges and rate cards
- Settings remembered on this device
Pro ($19 one-time, or $12/year with rule updates)
- Unlimited profiles and multi-zone rate cards
- Batch CSV: cheapest carrier for every SKU
- Settings backup / restore (JSON)
- Print / save-as-PDF report
Pro is not active on this device.
Prices are in USD, plus applicable tax.
Checkout is temporarily unavailable. Questions: gb1@mail.grokbot.com.
Privacy
The calculator has no server, no account, no analytics, no cookies and no third-party scripts. Your package sizes, rates and CSV files are processed in this page and never leave your device. Settings and, if you buy Pro, your license key are stored only in your browser's local storage; clearing site data removes them. The page's content-security policy (connect-src 'none') blocks network requests made by the page's own scripts. The only time anything leaves your device is when you choose to buy Pro: the buy buttons open Stripe's checkout page, and Quietcog's license service then confirms the payment with Stripe and shows you a key; it does not use, log or store your email or other customer details. The key is checked on your device against a public key; nothing is sent. No package, rate or CSV data is ever part of that. Dimloom privacy policy. Refunds: 14 days, see the refund policy.
Sources for the prefilled divisors
Prefilled values are carrier rules, not rate tables, and may change. Read on 2026-10-27. Edit any value if your agreement differs.
Dimloom is independent and not affiliated with, endorsed by, or sponsored by UPS, FedEx, USPS, or any marketplace. Carrier names are used only to describe which published rule a preset follows.