Mark Kloch's Dimensional Calculator

Instructions

Keep in mind that this calculator is USA centric.

The basic idea is to determine the chargeable weight for any given set of dimensions for domestic ground, domestic air, international air, and ocean transportation.

Step 1 — Choose Your Unit System

At the top of the input panel, select either:

• in / lbs — enter dimensions in inches; results shown in pounds, kilograms, cubic feet, and cubic meters.
• cm / kg — enter dimensions in centimeters and weight in kilograms; the calculator converts your inputs internally before calculating, so all results remain accurate.

The labels next to each input field update automatically to show the active unit (in or cm). You can switch between modes at any time — just clear the fields first.

Step 2 — Calculate Dimensional Weight

1. Enter numbers only in the Pieces, Length, Width, and Height fields.
2. Click the Dim Wt button.
3. Read the Precise (exact) and Rounded values for each shipping mode in the results panel.
4. The first row for each mode shows the result for your current entry.
5. The Running-Total row below it accumulates across all entries — useful when shipping multiple different-sized pieces in one shipment.
6. The Piece Count keeps a running total of all pieces entered.
7. Continue entering pieces and dimensions for as many items as needed. Each entry adds to the running totals.

3D Box Visualization

After each calculation the canvas displays an isometric 3D outline of the box using your entered dimensions, labeled with Width, Length, and Height in the active unit. This gives a quick visual check that you entered the dimensions correctly.

INCHES and CENTIMETERS Lists

At the bottom of the page, each calculation is logged to both lists automatically:

• INCHES — records each entry in inches regardless of input mode.
• CENTIMETERS — records each entry converted to centimeters.

These lists are useful for reviewing a multi-piece shipment before quoting.

Shipping Modes & Divisors

When using cm / kg mode the calculator converts your centimeter inputs to inches internally, applies the standard divisors, and displays the same results. No manual conversion needed.

LTL Freight Class Finder

1. Enter the Weight, Length, Width, and Height of the shipment in the Truck Class Finder panel on the right.
2. The unit labels (lbs or kg, in or cm) follow the same toggle as the main calculator.
3. Click Get Class.
4. Read the Density (lbs/ft³) and Class results.

Note: this is an estimating tool. The actual class assigned by your carrier may vary.