How to use the welding rod consumption calculator
The first figure a welding take-off needs is the weight of metal that ends up in the joint. Enter the weld metal cross-section, the total weld length and the steel density and the weld metal weight appears; add the deposition efficiency and the consumable weight you actually have to buy follows.
The relation applied is conservation of mass: weight = cross-section x length x density, and consumable = weight divided by deposition efficiency. The section goes in square inches, the length in feet and the density in pounds per cubic inch, so weight = section x length x 12 x density in pounds, with kilograms shown in parentheses. For example, a 0.1 in² section over 100 ft of weld at 0.284 lb/in³ is 34.08 lb (15.46 kg) of weld metal, and at 65% efficiency about 52.43 lb (23.78 kg) of rod. Deposition efficiency is the share of the consumable that becomes weld metal, so a lower efficiency raises the quantity. Values are as of October 2026.
Default deposition efficiencies change with process and consumable and were not confirmed in an authoritative source, so none are suggested and you enter your own; the 0.284 lb/in³ example is the usual carbon steel figure, so replace it for stainless or other alloys. Loss and rework allowances, consumption per foot and shielding gas use are not covered. Deriving the cross-section from the joint shape is not included either, so enter the area worked out from the drawing. This calculator is for reference and does not replace design; confirm order quantities against the consumable data sheet.
Frequently asked questions
It changes with the process and the consumable and was not confirmed in an authoritative source, so no value is suggested. Enter the figure from the data sheet of the consumable you use.
Loss and rework allowances and consumption per foot are not covered. This page is the quick version that shows only weld metal weight and consumable weight.
Work the area out from the groove shape and reinforcement on the drawing and enter it. Deriving the section from the joint type is not covered here.