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Miller's rule: about how many amps for 1/8 inch steel with MIG?

About 125 amps, one amp per .001 inch.

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  1. About 125 amps ✔
  2. About 60 amps
  3. About 250 amps

Why: Miller says each .001 inch of thickness needs about 1 amp. A 1/8 inch (.125) plate is 125 thousandths, so about 125 amps.

Huh, didn't know that: Miller lists .023 inch wire for 30 to 130 amps.

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References

Answer: About 125 amps. Miller says each .001 inch of thickness needs about 1 amp. A 1/8 inch (.125) plate is 125 thousandths, so about 125 amps.

  1. MIG Welding: Setting the Correct Parameters (Miller) www.millerwelds.com/en-us/resources/knowledge-hub/mig-welding/how-to/mig-welding-setting-the-correct-parameters
    each .001 inch of material thickness requires 1 amp of output.
    Checked 2026-10-10.

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