NET / GROUND CURRENT CALCULATOR

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B-field Calculator — Long Straight Wire
Magnetic field strength in milligauss near a long straight current-carrying wire.
Formula: B (mG) = 2 × I (A) / r (m)
Inputs
Example: household circuit ~1–15 A
Must be > 0. Example: 0.05 m = 5 cm
Results
0 mG
0
gauss (G)
0
tesla (T)
0
microtesla (µT)
0
nanotesla (nT)
Notes: 1 G = 1000 mG, 1 T = 10,000 G = 10,000,000 mG. Also: 1 mG = 0.1 µT = 100 nT.

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