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Free magnetic field calculator for straight conductors. Estimate magnetic flux density and field intensity from electric current and radial distance, with instant Tesla and microtesla outputs.
Last updated: April 20, 2026
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Magnetic field (uT)
60.000
Magnetic field (mT)
0.060000
Magnetic field (T)
6.000000e-5 T
Magnetic field intensity H
47.746 A/m
Interpretation
Estimated magnetic flux density is 60.000 uT around the conductor.
Model note:
Assumes an ideal long straight conductor in free space with negligible magnetic material effects.
Equation
B = mu0 I / (2 pi r)
Outputs
T, mT, uT
Relation
H = I / (2 pi r)
Current 15 A at 5 cm radial distance
Magnetic field
60.000 uT
Field intensity
47.746 A/m
The calculator applies the Biot-Savart and Ampere-law result for an ideal infinitely long straight wire in free space. Field strength decreases inversely with distance from the wire and increases linearly with current.
B = mu0 I / (2 pi r)H = I / (2 pi r)B = mu0 H (free space)Distances are converted from cm to meters internally to maintain SI-unit consistency.
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