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Geometric mean calculator

Find a multiplicative average without multiplying large products.

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Geometric mean calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Answer

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Geometric mean = exp(average of the natural logarithms of the values).

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Precision and calculation record
Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.
Saved scenario
Save the current answer, then change an input to compare. This clears when you leave.
Formula and assumptions
Only positive values are supported. For returns, enter growth factors such as 1.05 for a 5 percent gain, not the percentage itself.
In a list, use spaces, new lines, semicolons, or commas followed by a space. A comma between groups of three digits is a thousands separator.
Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.
Scratch calculator
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Updated 
Using Geometric mean calculator
Geometric mean = exp(average of the natural logarithms of the values).
Only positive values are supported. For returns, enter growth factors such as 1.05 for a 5 percent gain, not the percentage itself.
Next: Weighted average calculator
A worked example
With positive values = 2, 8, the geometric mean is 4.
Next: Mean absolute deviation calculator
Before you use the result
Only positive values are supported. For returns, enter growth factors such as 1.05 for a 5 percent gain, not the percentage itself.
Cite this page
ToolOctopus. “Geometric mean calculator.” Updated 2026-09-26. https://tooloctopus.com/geometric-mean-calculator.
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