Frequency Period and Wavelength Converter
Convert between frequency and period, then estimate wavelength and common wavelength fractions from free-space velocity, velocity factor, or a custom propagation velocity.
Input
Convert between frequency and period, then estimate wavelength from free-space velocity, velocity factor, or custom propagation speed.
Inputs accept engineering notation such as 1M for 1 MHz, 10n for 10 ns, and 200M for 200 Mm/s.
Result
Velocity factor is 1. For PCB traces and cables, use the material or cable propagation velocity, not free space, unless that is genuinely the model you want.
Wavelength fractions
Move between timing, frequency, and physical length
Frequency, period, and wavelength describe the same signal from different angles. Use this converter for clocks, RF estimates, cable checks, timing intuition, and first-pass signal-integrity context.
Clock and timing checks
Convert clock frequency into period when checking setup windows, sampling intervals, or timing-budget intuition.
Cable and PCB estimates
Use velocity factor or custom velocity to estimate wavelength and useful fractions in real interconnects.
Frequency-domain context
Relate period, frequency, wavelength, and propagation speed before moving to a more specific layout or signal-integrity calculator.
Equations, assumptions, and limits
The reciprocal frequency/period conversion is exact for a periodic signal. Wavelength is only as good as the propagation velocity you enter.
Period and frequency
Period is the time for one cycle. Frequency is cycles per second. Each is the reciprocal of the other.
Wavelength
Wavelength is propagation velocity divided by frequency. Real cables and PCB traces are slower than free space.
Not a full SI model
This is a first-pass utility. It does not model stackup dielectric dispersion, connector discontinuities, reflections, or routing geometry.
Related calculators and next checks
Rise time bandwidth calculator
Connect edge timing to approximate first-order bandwidth.
Engineering notation converter
Clean up frequency, period, velocity, and wavelength values before moving between calculators.
Engineering utility calculators
Browse notation, conversion, reference, and unit-prep tools.
Engineering reference
Equations, assumptions, and design guidance
Converts frequency and period and calculates wavelength for free space, a velocity factor, or a custom propagation velocity.
Equations and variables
T = 1 / flambda = v / f- f
- Frequency (Hz)
- T
- Period (s)
- v
- Propagation velocity (m/s)
- lambda
- Wavelength (m)
Assumptions and limitations
Assumptions
- Propagation velocity is constant at the frequency of interest.
- The entered velocity factor is relative to free-space light speed.
Limitations
- Dispersion, effective dielectric constant variation, and transmission-line geometry are not derived.
Worked example and design use
100 MHz in free space
Inputs: f = 100 MHz, v = 299,792,458 m/s
Outputs: T = 10 ns, lambda is about 3 m
Design guidance
- Use the cable or substrate propagation model when estimating physical interconnect length.