FedEx dim weight and box cost calculator
See what FedEx will bill for any box or poly bag on your own contract rates, and how to pay less. Free, no sign-up.
How it works
- Set the package. Drag the sliders for length, width, height and weight, and pick a box or a poly bag. Use outside measurements, the way a FedEx scanner sees it.
- Enter your FedEx terms. Set the dim divisor and your discount for each service, or paste your own rate table. It starts on 2026 list rates with the standard 139 divisor.
- Read the answer. You get the billed size and weight, the price on each service, any handling fee you triggered, and what you would save by trimming an inch.
What it accounts for
- Dimensional weight, with a divisor you set per service.
- FedEx rounding every fraction of an inch up to the next whole inch.
- Additional handling and oversize fees, including the minimum billed weights that come with them.
- Residential, delivery area and fuel surcharges.
- Poly bags, including the size limit where soft packs start to draw a handling fee.
Guides
- How FedEx dimensional weight works, with real 2026 numbers
- FedEx rounds every fraction of an inch up. Here is what it costs.
- Dim divisor 139 vs 166 vs 194: what a better divisor is worth
- Poly bag or box? How FedEx measures and bills soft packaging
- The size and weight lines that trigger FedEx handling fees
Common questions
What is dimensional weight?
FedEx multiplies a package's length, width and height in inches, divides by a dim divisor (139 unless your contract says otherwise), and rounds up to the next pound. It bills whichever is greater: that dimensional weight or the actual weight.
How does FedEx round package dimensions?
Since August 18, 2025, FedEx rounds any fraction of an inch up to the next whole inch. A side that measures 12.1 inches is billed as 13 inches.
What is a dim divisor, and can I use my own?
The dim divisor is the number cubic inches are divided by to get dimensional weight. The standard FedEx divisor is 139. Some contracts carry a higher one, such as 166 or 194, which lowers billed weight. This calculator lets you set a divisor for each service.
Which rates does the calculator use?
It starts with FedEx 2026 standard list rates, effective January 5, 2026, for Ground and Home Delivery, Express Saver, 2Day and Standard Overnight. You can apply your discount or paste your own rate table for each service. Ground Economy is an estimate until you enter your rates.
Is a poly bag cheaper than a box?
Often, for soft goods, because a filled bag usually measures smaller than a box. But a bag is measured at its widest points, loose tail included, and large soft packs can trigger an additional handling fee. Switch between box and poly bag in the calculator to compare.
Is it really free? Do you keep my rates?
Yes, it is free and there is no sign-up. Everything you enter stays in your browser tab and is gone when you close or refresh it. Nothing is stored.