Magnetic Field Strength Converter

ConversionEdited by Hemant Kumar and Anjita Rai, founders · How we checkUpdated Free · No sign-up

Quick answer: Choose a starting unit and a target unit, then enter a value. Common conversions: 1 A/m = 0.01256637 Oe; 1 A/m = 0.001 kA/m; 1 A/m = 0.01 A/cm. This converter covers 5 magnetic field strength units.

Use the Magnetic Field Strength Converter

Magnetic Field Strength formula and what each symbol means

target = value × (factor of starting unit ÷ factor of target unit), where each factor is the unit value in A/m.

Symbols used in the formula
SymbolMeaning
valueThe number you want to convert
factorThe unit’s size expressed in the base unit (A/m)

Magnetic Field Strength examples

A/m to Oe

10 A/m = 0.1256637 Oe.

A/m to kA/m

10 A/m = 0.01 kA/m.

A/m to A/cm

10 A/m = 0.1 A/cm.

How to calculate Magnetic Field Strength step by step

  1. Choose the starting unit and the target unit.
  2. Enter your value.
  3. Read the converted value, plus the conversion factor in both directions.

Popular magnetic field strength conversions

How to read your Magnetic Field Strength result

Magnetic field strength (H) is expressed in amperes per metre in SI units. One oersted is 1,000/(4π) A/m, about 79.577 A/m. This is different from magnetic flux density, which is measured in tesla or gauss.

UNITSYMBOLEQUALSVALUE OF 1 A/M
Ampere per meterA/m1 A/m = 1 A/m1 A/m
Kiloampere per meterkA/m1 kA/m = 1,000 A/m0.001 kA/m
Ampere per centimeterA/cm1 A/cm = 100 A/m0.01 A/cm
OerstedOe1 Oe = 79.577472 A/m0.01256637 Oe
Ampere per inchA/in1 A/in = 39.370079 A/m0.0254 A/in

Common mistakes when calculating Magnetic Field Strength

  • Confusing the oersted (field strength H) with the gauss (flux density B).
  • Mixing A/m and A/cm, which differ by 100.
  • Forgetting the 4π in the oersted definition.

Magnetic Field Strength FAQ

How many A/m is 1 oersted?

About 79.577 A/m.

How many A/m is 1 A/cm?

1 A/cm is 100 A/m.

What is the difference between H and B?

H is the field strength produced by currents; B is the resulting flux density, which also depends on the material.

What is the base unit for magnetic field strength?

This converter uses ampere per meter (A/m) as the common base unit: every value is first converted to it and then to the target unit.

How do I convert between two magnetic field strength units?

Choose the starting and target units, enter the value and read the result. By hand: convert to the base unit with the table, then divide by the target unit factor.

How many oersteds are in 1 ampere per meter?

1 A/m = 0.01256637 Oe.

How many kiloamperes per meter are in 1 ampere per meter?

1 A/m = 0.001 kA/m.

How many amperes per centimeter are in 1 ampere per meter?

1 A/m = 0.01 A/cm.

Which magnetic field strength units does this converter support?

It covers 5 units: ampere per meter (A/m), kiloampere per meter (kA/m), ampere per centimeter (A/cm), oersted (Oe), ampere per inch (A/in).

How accurate is the magnetic field strength converter?

Results are calculated at full double precision and shown to about 8 significant figures. Round the answer to the precision of your original measurement; a result cannot be more accurate than the number you started with.

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Method, review and disclaimer

Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the International System of Units (SI)