Result updated. Square root: 4.
Square root result
Main result from the values entered.
Square root
The square root of 16 is 4.
Squared check
16
This focused tool shows real-number square roots only.
How this square root calculator works
Enter a non-negative number and the calculator finds the value that multiplies by itself to return the original number.
Square root formula and squared check
The square root is shown as √x. The squared check multiplies the displayed result by itself, which helps explain small rounding differences for decimal roots.
What this calculator does not include
This calculator keeps things focused on real-number square roots. It does not show complex-number results, solve equations or replace the broader Scientific Calculator.
Key terms and assumptionsShort notes about square roots, squared checks, negative numbers and rounding.
- Square root
- A square root is the value that multiplies by itself to give the original number.
- Squared check
- The squared check multiplies the calculated root by itself to show the relationship to the input.
- Negative numbers
- This calculator keeps to real-number square roots and does not show complex-number results.
- Rounding
- Decimal roots may be rounded for display so the result stays readable.
Related calculators
Browse the Math calculators hub for related math tools.
- Scientific Calculator Use a safe scientific calculator for arithmetic, percentages, square roots, powers, logarithms, trigonometry, degrees and radians.
- Basic Calculator Use a simple online calculator for everyday addition, subtraction, multiplication, division, percentages and quick arithmetic.
- Exponent Calculator Raise a base number to a power, including common positive, negative and fractional exponents when the result is safe to show.
- Pythagorean Theorem Calculator Find a missing side of a right triangle using a² + b² = c².
- Rounding Calculator Round a number to selected decimal places using nearest, up or down rounding modes.
FAQs
What is a square root?
A square root is a number that, when multiplied by itself, gives the original number.
What is the square root of 0?
The square root of 0 is 0.
Can this calculator handle decimals?
Yes. Decimal inputs are supported.
Can it calculate square roots of negative numbers?
Not in this focused version. Negative numbers need complex-number output.
Why is there a squared check?
Squaring the result shows how close it is to the original number after rounding.
Can I copy the result?
Yes. Copy result copies a short summary.
Is this different from the Scientific Calculator?
This is a focused square-root tool. The Scientific Calculator handles broader expressions.