Practical tools for measured work
Power and root calculator
Square numbers, raise powers and compute real nth roots with domain validation.
Calculate the layout, check the diagram, then print the result for the shop or jobsite.
How it works
Power mode computes x^n; root mode computes the real nth root. Use exponent 2 to square a number or root index 2 for its square root. The cube root of −8 is −2. A negative number has no real even root.
Current-input example
The result above uses these exact values. This snapshot is included when the page is printed so the output can be checked against the original measurements.
- Power or root
- Raise to a power
- Number
- 9
- Exponent or root index
- 2
Primary result: Result: 81.
Before using the result
- Check the selected mode, units and input values before using the result.
- Read the assumptions and rounding rules; compare the worked example with your intended calculation.
- A numerical result does not supply missing context or change the stated limitations.
Limitations
Root indices must be whole numbers from 1 to 1000. Non-real results and overflow are rejected. Power mode follows JavaScript numeric conventions, including 0^0 = 1; this convention may not apply in every mathematical context.
Frequently asked questions
Are the displayed decimals exact?
Fractions, combinations and integer multiples use exact integer arithmetic. Other results use floating-point arithmetic and are rounded for display. Keep the exact fraction when a repeating decimal matters.
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