Find √ of any non-negative number, plus perfect-square detection and nearby roots.
√x is the number y where y × y = x
√144 = 12 because 12 × 12 = 144.
Bracket the number between perfect squares you know. √50 sits between √49 (7) and √64 (8), much closer to 7 — about 7.07. This estimate is accurate enough for quick checks.
Geometry (diagonals and the Pythagorean theorem), physics (distance fallen), finance (volatility) and statistics (standard deviation) all lean on square roots.
Real square roots require non-negative inputs; negatives involve imaginary numbers (√−1 = i). This calculator works with real numbers only.
The square of an integer: 1, 4, 9, 16, 25 and so on. Their roots are always whole numbers.
Full expression calculator with parentheses, powers, roots, trigonometry, logarithms and constants π and e.
Calculate X% of Y, find what percent one number is of another, and solve percentage increase problems in one place.
Find the percentage increase between an original value and a new value, including the absolute change.
Raise any base to any power, including negative and fractional exponents.
Compute ∛ for positive and negative numbers — cube roots of negatives are valid real numbers.
Work out how much a value dropped in percent terms, with the absolute reduction shown alongside.