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Root Calculator FullScreen

Calculate square roots, cube roots, or any other root of a number with ease. Simplify complex calculations and solve mathematical problems effortlessly using our versatile root calculator.

Square Root Calculator

Simplify square root calculations effortlessly. Get accurate results instantly for whole numbers, decimals, and negative numbers. Ideal for students, mathematicians, and professionals in various fields. Save time


Cube Root Calculator

Calculate the cube root of any number with our efficient Cube Root Calculator. Obtain precise results instantly, whether you're dealing with positive or negative numbers. Simply input the number and let the calculator do the rest. This tool is ideal for students, mathematicians, or anyone working with cube roots in various fields such as engineering, physics, or finance with the Cube Root Calculator.


General Root Calculator

Find the roots of any number with the General Root Calculator. Calculate square, cube, and higher roots effortlessly. Get accurate results instantly. Whether you need to find the square root, cube root, or any other root, this tool simplifies complex calculations with the General Root Calculator.



In mathematics, the general root, or the nth root of a number a is another number b that when multiplied by itself n times, equals a. In equation format:

na = b
bn = a

Estimating a Root

Some common roots include the square root, where n = 2, and the cubed root, where n = 3. Calculating square roots and nth roots is fairly intensive. It requires estimation and trial and error. There exist more precise and efficient ways to calculate square roots, but below is a method that does not require a significant understanding of more complicated math concepts. To calculate √a:

  1. Estimate a number b
  2. Divide a by b. If the number c returned is precise to the desired decimal place, stop.
  3. Average b and c and use the result as a new guess
  4. Repeat step two
EX:   Find √27 to 3 decimal places
  Guess: 5.125
27 ÷ 5.125 = 5.268
(5.125 + 5.268)/2 = 5.197
27 ÷ 5.197 = 5.195
(5.195 + 5.197)/2 = 5.196
27 ÷ 5.196 = 5.196

Estimating an nth Root

Calculating nth roots can be done using a similar method, with modifications to deal with n. While computing square roots entirely by hand is tedious. Estimating higher nth roots, even if using a calculator for intermediary steps, is significantly more tedious. For those with an understanding of series, refer here for a more mathematical algorithm for calculating nth roots. For a simpler, but less efficient method, continue to the following steps and example. To calculate na:

  1. Estimate a number b
  2. Divide a by bn-1. If the number c returned is precise to the desired decimal place, stop.
  3. Average: [b × (n-1) + c] / n
  4. Repeat step two
EX:   Find 815 to 3 decimal places
  Guess: 1.432
15 ÷ 1.4327 = 1.405
(1.432 × 7 + 1.405)/8 = 1.388
15 ÷ 1.3887 = 1.403
(1.403 × 7 + 1.388)/8 = 1.402

It should then be clear that computing any further will result in a number that would round to 1.403, making 1.403 the final estimate to 3 decimal places.

Square roots table

x x
0 0
0.25 0.5
0.5 0.70710678
1 1
2 1.14121356
3 1.73205081
4 2
5 2.23606798
6 2.44948974
7 2.64575131
8 2.82842712
9 3

Root Calculator Example

Number Square Root Cube Root Fourth Root
16 4 2 2
81 9 4.3267 3.0001
9 3 2.08 1.7321
25 5 2.92 2.2361

With the Root Calculator, you can find the square root, cube root, or fourth root of any number accurately and easily.