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03 // Bidirectional STEM Calculators // ENGINEERINGf₀ = 1 / (2 × π × √(L × C))

LC / RLC Resonant Frequency Calculator

In an LC or RLC tank circuit, electrical resonance occurs at the natural frequency f₀ where inductive reactance X_L exactly cancels capacitive reactance X_C: f₀ = 1 / (2 × π × √(L × C)).

f₀ = 1 / (2 × π × √(L × C))
Pick which value you want to calculate (or type into any field):Solving for: f₀ — Resonant Frequency
Calculated

Natural LC oscillation frequency in Hertz

11.0000e+9

Inductance in millihenries (switch inline unit for μH or H)

0.000110,000.00

Capacitance in microfarads (switch inline unit for nF or pF)

1.0000e-610,000.00
Calculated Result · Resonant Frequency (f₀)
7,117.63Hz
Converted units:

Step-by-Step Calculation

01Canonical Law: f₀ = 1 / (2 × π × √(L × C))
02Given Inputs (Base Units): L = 0.5 mH, C = 1 μF
03Solve for f₀ (Resonant Frequency): f₀ = 7,117.63 Hz

In an LC or RLC tank circuit, electrical resonance occurs at the natural frequency f₀ where inductive reactance X_L exactly cancels capacitive reactance X_C: f₀ = 1 / (2 × π × √(L × C)).

Real-World Reference Values

Qi Wireless Charging Tankf₀ = 100 – 205 kHz

Resonant inductive power transfer standard

NFC / HF RFID Carrierf₀ = 13.56 MHz

Tuned loop antenna with pF capacitor bank

Characteristic Impedance (Z₀)Z₀ = √(L / C)

Determines Q-factor alongside series resistance R

20-Row Comparison Table

Resonant Frequency (f₀) · Tank Inductance (L)

LC / RLC Resonant Frequency Calculator — Tank Inductance → Resonant Frequency
#Tank Inductance (mH)Resonant Frequency (Hz)Δ %
010.5 mHCurrent7,117.63 Hz0.00%
0272.3948 mH591.5158 Hz-91.69%
03144.7896 mH418.265 Hz-94.12%
04217.1843 mH341.512 Hz-95.20%
05289.579 mH295.7581 Hz-95.84%
06361.9738 mH264.5341 Hz-96.28%
07434.3685 mH241.4855 Hz-96.61%
08506.7632 mH223.5721 Hz-96.86%
09579.1579 mH209.1325 Hz-97.06%
10651.5527 mH197.1721 Hz-97.23%
11723.9474 mH187.0538 Hz-97.37%
12796.3421 mH178.3488 Hz-97.49%
13868.7369 mH170.756 Hz-97.60%
14941.1316 mH164.0571 Hz-97.70%
151,013.53 mH158.0893 Hz-97.78%
161,085.92 mH152.7288 Hz-97.85%
171,158.32 mH147.879 Hz-97.92%
181,230.71 mH143.4637 Hz-97.98%
191,303.11 mH139.4217 Hz-98.04%
201,375.50 mH135.7031 Hz-98.09%
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Frequently Asked Questions

How do I find the tuning capacitor C needed to resonate an antenna coil at 13.56 MHz?+

Click SOLVE FOR on C, switch f₀ unit to MHz and enter 13.56, and enter your coil inductance L in μH.

What is the total impedance of a series RLC circuit at resonance f₀?+

At f = f₀, X_L and X_C cancel completely, leaving pure resistive impedance Z = R and unity power factor (PF = 1.0).

How does doubling both L and C affect resonant frequency?+

Multiplying both L and C by 2 increases √(LC) by 2, cutting resonant frequency f₀ in half.