Use this free online root calculator to find the nth root of any number, including square roots, cube roots, and higher-order roots. Simply enter a number and the root degree to get an instant, precise result without doing the math by hand.
How to Use the Root Calculator
Enter the number you want to find the root of in the "Number" field.
Enter the root degree in the "Root Degree (n)" field — use 2 for a square root, 3 for a cube root, or any other whole number.
Click "Calculate" to instantly see the result.
If the inputs are invalid, such as an even root of a negative number, an error message will explain why.
Frequently Asked Questions
It raises the number (radicand) to the power of 1 divided by the root degree (n), i.e. result = sign(radicand) × |radicand|^(1/n). For example, the 3rd root of 27 is calculated as 27^(1/3) = 3.
Yes, but only for odd root degrees. For an even root degree (like 2 or 4) of a negative number, the result is not a real number, so the calculator shows "Not a real number for an even root of a negative number" instead of a value.
A root degree of 0 is undefined, so the calculator returns the error "Root degree cannot be zero" instead of attempting a calculation.
Yes, this root calculator is completely free with no sign-up required, and you can use it as many times as you like.