ELECTRONICS · CALCULATOR

Reactance calculator

Free reactance calculator: get inductive reactance and capacitive reactance from frequency, inductance and capacitance. With the formula shown.

Written by Chameera Sampath · Not yet reviewed by a licensed electrician. See the methodology.

US (NEC) only · NFPA 70 / NEC — locally adopted editionDefaults are US values. Verify the locally adopted NEC edition and project data.Official reference ↗

Project inputs

Measurements

Frequency

Inductance

Capacitance

µF

Updates as inputs change. Unit changes preserve the same physical values.

THE MATH BEHIND THE ANSWER

Method & assumptions

XL = 2πfL; XC = 1 / (2πfC)

Ideal components, single frequency.

Results do not check every aspect of an electrical installation. The calculators follow US (NEC) practice only; a regional preset changes defaults such as voltage and units, and no result certifies NEC compliance.

Sources and validation →

Worked example

Frequency: 60 Hz · Inductance: 10 mH · Capacitance: 100 µF

Inductive reactance: 3.77 Ω · Capacitive reactance: 26.526 Ω

This example uses the stated inputs; results for the entered values appear above.

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