What is the square root of 42?

Answer

6.480741

42 is not a perfect square6.480741² = 6.480741² ≈ 426.480741 × 6.480741 = ≈ 42

Need a custom calculation?

Open the full calculator with custom inputs

How We Calculated This

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

√42 = 6.480741

Related Calculations

What is the square root of 1?1 (exact)What is the square root of 2?1.414214 What is the square root of 3?1.732051 What is the square root of 4?2 (exact)What is the square root of 5?2.236068

Calculated using verified formulas. Last updated March 2026.