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Shipping Cost Estimator

Compare shipping costs across USPS, UPS, and FedEx. Calculates dimensional weight and finds the cheapest carrier.

Last updated: February 23, 2026

Package Details

Package Weight

lbs

Dimensions (inches)

Origin Zip Code

Destination Zip Code

How Shipping Costs Are Calculated

Shipping carriers use a combination of actual weight and dimensional (DIM) weight to determine your shipping cost. You are always charged the higher of the two, which is called the "billable weight."

What Is Dimensional Weight?

Dimensional weight reflects how much space a package takes up relative to its actual weight. It is calculated as: Length x Width x Height / DIM Factor. UPS and FedEx use a DIM factor of 139, while USPS uses 166, making USPS more favorable for lightweight, bulky items.

Tips to Save on Shipping

Right-size your box: Using a box that is too large inflates your dimensional weight. Choose the smallest box that safely fits your product with adequate padding.
Compare carriers: USPS is often cheapest for packages under 2 lbs. UPS and FedEx become more competitive for heavier shipments, especially with a business account discount.
Use flat-rate options: USPS Priority Mail Flat Rate boxes can save money on heavy, small items since the cost is fixed regardless of weight.
Negotiate rates: If you ship 50+ packages per month, contact UPS and FedEx to negotiate discounted rates. Savings of 20–40% are common for regular shippers.
Consider regional carriers: For shorter distances, regional carriers like OnTrac or LSO can undercut the national carriers by 15–25%.

How To Use Shipping Cost Estimator

Compare shipping costs across USPS, UPS, and FedEx. Calculates dimensional weight and finds the cheapest carrier. This tool runs in-browser for fast results without account setup.

1Open the Shipping Cost Estimator and add your input data.
2Adjust the options to match your use case.
3Run the tool and review the output details.
4Download, copy, or reuse the result immediately.

FAQ

Is Shipping Cost Estimator free to use?

Yes. Shipping Cost Estimator is free to use on ConvertCrunch.

How accurate is Shipping Cost Estimator?

Results depend on the inputs and assumptions you provide. Always validate final numbers or outputs against your official workflow before publishing or filing.

Do I need an account to use Shipping Cost Estimator?

ConvertCrunch tools are built for immediate use with no signup required.

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How Shipping Costs Are Calculated

Shipping carriers use a combination of actual weight and dimensional (DIM) weight to determine your shipping cost. You are always charged the higher of the two, which is called the "billable weight."

What Is Dimensional Weight?

Tips to Save on Shipping

Right-size your box: Using a box that is too large inflates your dimensional weight. Choose the smallest box that safely fits your product with adequate padding.
Compare carriers: USPS is often cheapest for packages under 2 lbs. UPS and FedEx become more competitive for heavier shipments, especially with a business account discount.
Use flat-rate options: USPS Priority Mail Flat Rate boxes can save money on heavy, small items since the cost is fixed regardless of weight.
Negotiate rates: If you ship 50+ packages per month, contact UPS and FedEx to negotiate discounted rates. Savings of 20–40% are common for regular shippers.
Consider regional carriers: For shorter distances, regional carriers like OnTrac or LSO can undercut the national carriers by 15–25%.