What is the square root of 138?

Answer

11.747340

138 is not a perfect square11.747340² = 11.747340² ≈ 13811.747340 × 11.747340 = ≈ 138

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How We Calculated This

√n — the number which, multiplied by itself, equals n

√138 = 11.747340

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Calculated using verified formulas. Last updated March 2026.