Shipping tools and calculators

Free, browser-based, no account required

Last reviewed on April 27, 2026.

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Shipping rate calculator

Compare reference rates from USPS, UPS, FedEx, and DHL for your package weight, dimensions, and destination. Find the most economical option at a glance.

Most popular
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Delivery time estimator

Plug in a ship date, destination, and service level to get best-case, typical, and worst-case arrival windows — including expected customs hold time.

Live tool
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Weight unit converter

Convert between pounds, ounces, kilograms, and grams. Customs forms typically expect metric, while U.S. carrier scales read in imperial.

Quick utility

Featured tools

Multi-carrier rate calculator

The starting point for most shipments — see USPS, UPS, FedEx, and DHL side by side before you commit to a label.

Delivery time estimator

Set realistic expectations with the recipient. Customs adds days that the carrier's "transit time" alone doesn't reflect.

How to use these tools together

The tools are designed to follow the order in which most shipments are actually planned:

  1. Start with the rate calculator to see which services and carriers are even in range for your package weight and destination. Eliminate the obviously expensive options.
  2. Run the same shipment through the delivery estimator. Two services with similar prices can have very different arrival windows once customs clearance is factored in.
  3. Use the weight converter when filling out the customs form. Imperial-to-metric mistakes on CN22/CN23 forms are a surprisingly common source of customs flags.

What the tools won't do

  • They won't generate live carrier quotes. Rates shown are reference figures based on the carriers' published service guides. Account discounts, fuel surcharges, and remote-area fees move the actual price.
  • They won't book a label. When you have your carrier picked, you book directly on the carrier's website.
  • They won't calculate exact duty owed. Duty depends on HS classification at the destination — see duties and taxes for how to estimate it.

Related reference

For sizing and pricing

For customs and rules

Try the rate calculator Delivery estimator Weight converter