Peak, Peak-to-Peak and RMS Calculator

Why 240V AC peaks at about 340V.

For a pure sine wave only. Meters normally show RMS. Everything is worked out in your browser. Nothing is saved or sent anywhere.

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How it was worked out

    What this does and doesn't tell you

    • Modified sine and other waveforms have different ratios. A true-RMS meter reads them more accurately.
    • 240V AC mains can kill. In Australia, work on household mains wiring must be carried out by a licensed electrician. Low-voltage DC systems can still deliver very high current.
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