Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Coil current (A)

Coil drive current.

Turn count

Number of turns in the coil.

Pole area (m²)

Cross-sectional area of the magnetic pole face.

Air gap (m)

Working air gap between pole and armature.

Estimate the attraction force of a solenoid actuator from ampere-turns, gap, and pole area. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Solenoid force (N)

Estimated magnetic attraction force.

• Solenoid force and inductance change with gap, position, current, saturation, temperature, plunger geometry, spring load, friction, and drive waveform. Continuous and intermittent coil ratings and flyback protection must be checked.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Solenoid Pull Force At Distance

  Estimate ideal solenoid attraction across one air gap as μ0(NI)²A/(2g²); assumes negligible leakage, fringing, saturation, and iron reluctance.

• Magnetomotive Force

  Calculate magnetomotive force as winding turns × current in ampere-turns. The current sign determines field direction under the selected winding convention.

• Solenoid Inductance

  Calculate air-core solenoid inductance from turns, area, and length.