The cube root of a number n is the value x such that x³ = n.
∛27 = 3, ∛64 = 4, ∛125 = 5.
Negative numbers have real cube roots: ∛(-8) = -2.
Reach for this calculator when you need a result you can act on confidently. The formula is straightforward, but manual computation introduces rounding errors that this tool eliminates entirely.
The most frequent error is rounding intermediate values before completing the full calculation. Round only the final result — rounding intermediate steps compounds errors in multi-step calculations, sometimes significantly.
A student checks their overall module grade before results day: 3 assignments scored 72%, 68%, and 81% — the calculator confirms the weighted average and tells them what score they would need on the final exam to achieve a target grade.
∛27 = 3, because 3 × 3 × 3 = 27.
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