Frequency Dashboard
Analyze signals from Hertz to Gigahertz.
Physics & Audio
Quick Formulas
- Frequency to RPMHz × 60
- Frequency to PeriodT = 1 / Hz
- Angular Velocityω = 2π × f
Explore More Unit Converters
Frequency Converter: Hz, Period, Wavelength & RPM
Frequency is the heartbeat of the universe. It describes how often something happens over a specific period. From the rumble of a car engine (RPM) to the pitch of a musical note (Audio Frequency) to the Wi-Fi signal connecting your device (Radio Frequency), everything vibrates.
Welcome to the Advanced Frequency Calculator, a unified dashboard designed to bridge the gap between Audio, Engineering, and Physics.
Visualization & Analysis
Cycle Analysis
Instantly see the relationship between Frequency (Hz) and Period (ms). As frequency goes up, period goes down.
Spectrum Scale
Our "Spectrum Bar" visualizes where your signal lives: Infrasound, Audio, Radio Frequency (RF), or Microwave.
Physics & Audio
Features a built-in Tone Generator to play the frequency and a Wavelength Calculator for antenna design.
Understanding the Units
1. Hertz (Hz) - The Standard
Named after Heinrich Hertz, this is the SI unit for frequency. One Hertz equals one cycle per second.
- 1 Hz: One event per second.
- 1 kHz (Kilohertz): 1,000 events per second. (Typical for Audio).
- 1 MHz (Megahertz): 1,000,000 events per second. (Typical for FM Radio).
- 1 GHz (Gigahertz): 1,000,000,000 events per second. (Typical for Wi-Fi and CPUs).
2. RPM (Revolutions Per Minute)
Used primarily in mechanics and automotive engineering. Since Hertz is "per second" and RPM is "per minute," the conversion is a factor of 60.
Formula: RPM = Hz × 60
Example: A car idling at 800 RPM is vibrating at approximately 13.3 Hz. This low frequency is why you can feel the rumble of an engine in your chest.
3. Time Period (T)
Frequency and Time are inverses of each other. The "Period" is how long it takes for one single cycle to complete.
Formula: T = 1 / f
Example: A 60Hz electrical cycle completes one wave in 16.6 milliseconds. High frequencies have tiny time periods; a 2.4 GHz Wi-Fi wave finishes a cycle in just 0.4 nanoseconds.
Real-World Applications
For Audio Engineers & Musicians
This tool acts as a Pitch Converter.
- Standard Pitch: Modern music is tuned to A4 = 440 Hz.
- Bass Frequencies: The human ear can hear down to ~20 Hz. Sub-bass in music typically sits between 40 Hz and 60 Hz.
- The "Mosquito" Tone: Humans lose the ability to hear high frequencies as they age. Most adults cannot hear above 15 kHz. Use the Tone Generator in this tool to test your own hearing limit.
For Radio (RF) Engineers
When dealing with antennas, Wavelength is critical. The size of an antenna is usually proportional to the wave it is trying to catch (often 1/2 or 1/4 of the wavelength).
Formula: λ = c / f (where c is the speed of light)
- Example: A 100 MHz FM radio wave is about 3 meters long. This is why FM radio antennas on cars are roughly 0.75 meters (1/4 wave).
- Example: A 2.4 GHz Wi-Fi wave is only 12.5 cm long. This is why Wi-Fi router antennas are short.
For Electrical Engineers
The world runs on Alternating Current (AC). North America uses 60 Hz (Period: 16.6ms). Europe/Asia uses 50 Hz (Period: 20ms). Understanding these timings is crucial when designing circuits that rely on "Zero Crossing Detection" or analyzing flicker in LED lights.
Features for Professionals
Integrated Tone Generator
Turn numbers into sound. Play a pure sine wave directly from your browser to test speakers or tune instruments.
Scientific Precision
Supports scientific notation for extreme values (GHz to Nanoseconds).
Visual Spectrum
Instantly see if your frequency is Audio, Radio, or Microwave.
Music Note Mapping
Type 440 Hz and see "A4". Type 261.6 Hz and see "C4" (Middle C).
Frequently Asked Questions
How do I convert Hz to RPM?
To convert Hertz (cycles per second) to RPM (revolutions per minute), multiply by 60. For example, 50 Hz = 50 × 60 = 3000 RPM. Conversely, to convert RPM to Hz, divide by 60.
What is the relationship between Frequency and Period?
They are inversely related. Frequency (f) is how many cycles happen in one second. Period (T) is how many seconds one cycle takes. The formula is T = 1 / f. For example, a 10 Hz signal has a period of 0.1 seconds (100ms).
What frequency is audible to humans?
The standard human hearing range is roughly 20 Hz to 20,000 Hz (20 kHz). Frequencies below 20 Hz are called 'Infrasound', and frequencies above 20 kHz are 'Ultrasound'.
How do I convert GHz to Hz?
Giga means billion (10^9). To convert GHz to Hz, multiply by 1,000,000,000. For example, 2.4 GHz (WiFi) is 2,400,000,000 Hz.
Why do engines use RPM instead of Hz?
RPM (Revolutions Per Minute) is more intuitive for mechanical objects that rotate relatively slowly compared to electronics. An engine idling at 800 RPM is easier to visualize than saying it's spinning at 13.33 Hz.
What is angular frequency (rad/s)?
Angular frequency (ω) measures how much 'phase' changes per second in radians. Since one full cycle is 2π radians, the formula is ω = 2π × f. It is commonly used in physics for calculating rotational dynamics and alternating current (AC) circuits.
What is the frequency of AC power?
It depends on your region. In the US, Canada, and parts of South America, the standard is 60 Hz. In Europe, Australia, Asia, and Africa, the standard is 50 Hz.