Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Filler metal needed (purchase weight)
5.68
Estimated filler metal cost
$29.56
Actual deposited weld metal weight
5.40
Waste (spatter/stub/slag loss)
0.28
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter total weld length (ft).
- 2Enter deposited weight per foot (by joint/leg size) (lb/ft).
- 3Enter welding process.
- 4Enter filler metal price ($/lb).
- 5Read your filler metal needed (purchase weight) on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Filler metal consumption is driven by weld length, bead size (leg size for fillets, or cross-sectional area for grooves), deposition efficiency (how much of the rod/wire actually becomes weld metal versus spatter, stub loss, or slag for stick welding), and the density of the filler alloy. Deposition efficiency varies a lot by process: SMAW (stick) runs 55-65% due to stub loss and slag, GMAW (MIG) solid wire runs 92-98%, flux-cored (FCAW) runs 80-90%, and TIG with filler rod runs close to 95%+ since there's minimal waste. This calculator estimates required filler weight from weld length and an assumed weight-per-foot for the joint size (a standard reference value you can adjust for your specific joint geometry), divides by deposition efficiency to account for waste, and converts to cost using your rod/wire price per pound. Use this for material planning on a job or to sanity-check a weld cost estimate against a competing quote.
Worked example
Using the values the calculator loads with:
Inputs
- Total weld length: 40 ft
- Deposited weight per foot (by joint/leg size): 0.135 lb/ft
- Welding process: GMAW (MIG) solid wire — ~95%
- Filler metal price: 5.2 $/lb
Results
- Filler metal needed (purchase weight): 5.68
- Estimated filler metal cost: $29.56
- Actual deposited weld metal weight: 5.4
- Waste (spatter/stub/slag loss): 0.28
What each field means
Inputs
- Total weld length (ft)
- The total weld length used in the calculation, measured in ft. Starts at 40 ft so you have a working example on load.
- Deposited weight per foot (by joint/leg size) (lb/ft)
- The deposited weight per foot (by joint/leg size) used in the calculation, measured in lb/ft. Starts at 0.135 lb/ft so you have a working example on load.
- Welding process
- Pick the option that matches your situation — the maths changes per option. Choices: SMAW (Stick) — ~60% efficiency, GMAW (MIG) solid wire — ~95%, FCAW (Flux-cored) — ~85%, GTAW (TIG) — ~97%.
- Filler metal price ($/lb)
- The filler metal price used in the calculation, measured in $/lb. Starts at 5.2 $/lb so you have a working example on load.
Results
- Filler metal needed (purchase weight)
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Estimated filler metal cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Actual deposited weld metal weight
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Waste (spatter/stub/slag loss)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How do I find weight-per-foot for my joint size?
AWS welding handbooks and filler metal manufacturer charts list deposited weight per foot by fillet leg size and groove weld dimensions — for reference, a 1/4-inch fillet weld runs roughly 0.135 lb/ft, and weight scales roughly with the square of leg size, so a 3/8-inch fillet needs about 2.25x the filler of a 1/4-inch fillet.
Why is stick welding so much less efficient?
Stick electrodes leave a stub end (typically 1.5-2 inches) that gets discarded, plus slag and spatter losses during the arc. MIG and TIG have essentially no stub loss and much less spatter, which is a major reason shops switch to MIG/FCAW for high-volume production welding despite stick's portability advantages.
Does this account for multi-pass welds?
Yes, as long as your weight-per-foot figure already reflects the total deposited weight for the full joint (all passes combined), which is how most reference charts present the data for a given final weld size. If you're calculating pass-by-pass, sum each pass's deposited weight separately before dividing by efficiency.
How much filler should I buy above the calculated amount?
Add 10-15% buffer for rework, tack welds, and practice/setup passes beyond what this calculator shows, especially for a new welder or first run of a new joint design, since first-pass yield is rarely 100% on a new setup.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Weld Rod / Wire Consumption Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/weld-rod-consumption
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/weld-rod-consumption" target="_blank" rel="noopener">Weld Rod / Wire Consumption Calculator — RevenueLab</a> (2026).</p>
Source: [Weld Rod / Wire Consumption Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/weld-rod-consumption) (2026).