Calculate free-space wavelength λ, guided wavelength λg, and quarter-wave length λ/4 at any RF frequency for free space, microstrip, and coaxial transmission lines.
Interactive Wavelength Calculator
Free Space & Guided Wavelength
Free-space λ₀
—
Guided wavelength λg
—
Phase velocity vp
—
Quarter-wave λ/4
—
Half-wave λ/2
—
3λ/4 length
—
Wavelength Reference Table
Frequency
Free-space λ
FR4 λg (εe≈3.43)
Coax (εe=2.3)
433 MHz
692 mm
374 mm
456 mm
900 MHz
333 mm
180 mm
220 mm
1.8 GHz
167 mm
90 mm
110 mm
2.4 GHz
125 mm
67.5 mm
82.5 mm
5 GHz
60.0 mm
32.4 mm
39.6 mm
28 GHz
10.7 mm
5.78 mm
7.07 mm
77 GHz
3.89 mm
2.10 mm
2.57 mm
RF View Wavelength Calculator: Built into RF View's Utilities tab and Microstrip Calculator. Enter frequency and substrate parameters to get all wavelength variants instantly. Offline on Android.