Impedance Calculator
ac impedance calculator. Get instant, accurate results. Enter values for instant results with step-by-step formulas.
Formula
Z = โ(Rยฒ + (X_L - X_C)ยฒ) | ฯ = arctan((X_L-X_C)/R)
Total opposition to AC current flow. Combines resistance and reactance.
Frequently Asked Questions
What is impedance and how does it differ from resistance?
Resistance opposes DC current and is purely real. Impedance opposes AC current and includes resistance plus reactance (from capacitors and inductors). Impedance is a complex number: Z = R + jX, measured in ohms. Capacitive reactance decreases with frequency while inductive reactance increases with frequency.
How accurate are the results from Impedance Calculator?
All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.
What formula does Impedance Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
Does Impedance Calculator work offline?
Once the page is loaded, the calculation logic runs entirely in your browser. If you have already opened the page, most calculators will continue to work even if your internet connection is lost, since no server requests are needed for computation.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.