Square Root Calculator
The square root of x is the number that multiplied by itself gives x; √144 = 12 because 12 × 12 = 144. Use 2nd + √ for cube roots.
At a glance
| What it is | Free square root calculator, plus cube roots and nth roots. √144 = 12, ∛27 = 3, √2 ≈ 1.414213562. Answers update as you type. |
|---|---|
| Type | Interactive guide with a calculator |
| Level | High school and college |
| Price | Free, with no account or sign-up |
| Works offline | Yes, after the first visit; installs as an app |
| Made by | Aalok (aalok.builds@gmail.com) |
| Last updated | 1 November 2026 |
Key facts
| Definition | √x · √x = x (for x ≥ 0) |
|---|---|
| Perfect squares | √4 = 2, √9 = 3, √16 = 4, √25 = 5, √100 = 10 |
| √2 | ≈ 1.414213562 |
| Cube root | ∛27 = 3 and ∛(−8) = −2 |
| As a power | √x = x^(1/2); the nth root of x = x^(1/n) |
How do you simplify a square root?
Split out perfect-square factors: √72 = √(36 × 2) = 6√2 ≈ 8.485.
How to use it in Plotline
- √144 is already entered; its answer shows next to the input.
- Tap √ for square roots, or 2nd then ∛ for cube roots.
- Press = to keep the answer in the history.
Frequently asked questions
Can I take the square root of a negative number?
Not among the real numbers, so Plotline shows an error for √(−9). In the complex numbers the answer is written 3i, where i² = −1, but Plotline works with real numbers only.
Is it free?
Yes. The scientific calculator is free with no account and no sign-up, and every function is available: logs, roots, trigonometry, factorials, powers and constants. It installs as an app on a phone or computer and works offline.
Learn more
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Plotline is an independent project and is not affiliated with Desmos, Texas Instruments or Casio.