Sine Wave with 90° Phase Shift (Cosine)

A sine wave phase-shifted by 90° is mathematically identical to a cosine wave.

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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.

Shifting a sine wave by 90° produces a cosine wave — a fundamental identity in trigonometry.

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.