Sine Wave Calculator & Plotter
Plot a sine wave y = A·sin(2πft + φ). Enter amplitude, frequency and phase to see the waveform, period, angular frequency and RMS value.
How to use this tool
- Enter amplitude (a), frequency (hz), phase shift (°) and cycles to plot in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your period (s) and the full breakdown beneath it.
A sine wave is described by y(t) = A · sin(2πft + φ), where A is amplitude, f is frequency in Hz, and φ is the phase in radians. The RMS value of a pure sine wave is A / √2.
Frequently asked questions
- What is the RMS value used for?
- Root-mean-square (RMS) voltage or current tells you the effective power of an AC signal. Mains electricity (e.g. 120 V / 230 V) is quoted in RMS.
- What is angular frequency?
- Angular frequency ω = 2πf, measured in radians per second. It's often more convenient in equations than ordinary frequency f.