In Excel: use =POWER(number, power) — it raises a base to an exponent, so =POWER(2, 10) returns 1024. The ^ operator does the same thing: =2^10.
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Syntax
Arguments
| Argument | required / optional | Description |
|---|---|---|
number | required | The base value. |
power | required | The exponent. Fractions give roots — 1/3 is a cube root. |
Related functions
Select the result cell and type =POWER(.
Enter or select the base value, then a comma.
Enter the exponent — a whole number to multiply out, a fraction such as 1/4 to take a root.
Press Enter. For a growth rate, subtract 1 from the result and format the cell as a percentage.
What this does
POWER raises a number to an exponent and is exactly equivalent to the ^ operator, so which you use is a readability decision rather than a functional one. Its real everyday value is fractional exponents, which produce roots: raising to 1/3 gives a cube root, and raising a growth ratio to 1/n is the core of every compound-growth calculation. A CAGR is literally =POWER(end/start, 1/years)-1. Negative exponents give reciprocals. A negative base with a fractional exponent has no real answer and returns #NUM!. The same idea underpins a lot of everyday Excel work, so the few minutes spent getting it right here pay back across every sheet you build afterwards. Treat it as a pattern, not a one-off, and it stops being something you look up and starts being something you reach for. The difference between a quick fix and a sheet you can trust is the extra minute you spend validating “exponent function excel”. Start on a copy or a tiny sample, keep the affected formula visible, and compare the result with the outcome you expected before you touch the real workbook. When a formula is involved, keep the inputs labelled beside it, reference cells instead of typing values, and apply number formatting only after the result checks out. The point is a calculation you can defend to a CFO or an auditor, but the practical win is that someone else can open the file and understand what happened without asking you.
A worked example
Compound annual growth from 120,000 to 195,000 over 4 years: =POWER(195000/120000, 1/4)-1 returns about 0.1281, or 12.81 %. A cube root of 27 is =POWER(27, 1/3), which returns 3. Doubling capacity ten times over: =POWER(2, 10) returns 1024. POWER is the backbone of every compound-growth and rate calculation, because the fractional exponent is what converts a total change into a per-period one. Check the referenced cells, argument order and result type in your workbook. Start with the worked example before changing an input, then compare the changed result with the calculation you expected. An error value or a result of a different type is a reason to inspect the inputs and arguments.
In Google Sheets
Google Sheets support for this task has not been verified. Check the function, arguments and workflow in the target product before transferring the example. Matching formula notation does not establish identical behaviour. The aim was to get you unstuck fast and leave you a little more capable than a copy-paste would. The answer is at the top and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. For “exponent function excel”, keep the input cells and the result visible while you check the formula in Excel. Follow the worked example and change one input at a time. The steps explain the workbook calculation; this page does not run a live calculator for that task.
Common mistakes
- Writing 1/4 without brackets inside a larger expression, where operator precedence changes the meaning — wrap the exponent when in doubt.
- Taking a fractional power of a negative base, which returns
#NUM!because no real root exists. - Forgetting the -1 in a growth-rate formula, which reports the growth factor (1.128) rather than the rate (12.8 %).
Frequently asked questions
Is POWER the same as the ^ operator?
Yes, =POWER(2,10) and =2^10 give identical results. POWER reads more clearly inside a long formula; ^ is shorter.
How do I calculate a root?
Use a fractional exponent: =POWER(A2, 1/3) is the cube root, =POWER(A2, 1/2) the square root — though SQRT says the latter more directly.
How do I calculate CAGR?
=POWER(end/start, 1/years)-1, formatted as a percentage. The fractional exponent is what turns total growth into an annual rate.