RC Time Constant Calculator

Calculates or estimates rc time constant for engineering use.

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Result

Time constant τ (s)

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Time to 63% charge

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RC Time Constant Calculator — How It Works

Calculates or estimates rc time constant for engineering use. Try the RC Time Constant Calculator in your browser — instant results, no sign-up.

Enter your values in the fields shown. Results update live as you type.

Yes — runs entirely in your browser.