Average Calculator

How to calculate an average

1. Choose the decimal mark used in your list. Point format accepts comma-separated numbers; comma format uses semicolons, spaces or new lines between numbers.
2. Paste or type your numbers without digit grouping. Keep the same units and comparison basis; each value has equal weight.
3. Check Read as and Count to confirm the list was understood as intended. Every explicit zero and repeated observation counts; blank gaps do not.
4. Read the mean and exact sum. Open Calculation details for the minimum, maximum and formula, then copy the summary or clear the list if useful.

A clear arithmetic-mean calculation

• Average a list of positive, negative or zero values with equal weight.
• Choose decimal-point or decimal-comma input explicitly instead of relying on guessing.
• Check a short interpreted preview, count and exact sum before using the result.
• Keep very small nonzero and rounded means clearly qualified.
• See the minimum, maximum and sum-divided-by-count method without uploading a file or creating an account.

When a simple mean is useful

• Average equally weighted scores already expressed on the same scale, without assuming a course's grading policy.
• Summarize repeated measurements or comparable quantities using the same unit.
• Check a manually calculated sum and mean, or see how including an explicit zero changes an average.

Understanding the mean and your number list

The arithmetic mean is the sum of the values divided by their count. For 2, 4 and 6, the sum is 12 and the count is 3, so the average is 4. Repeated values are separate observations, not duplicates to remove.

The decimal-mark choice controls input only. Under point format, 1,5 means two numbers, 1 and 5. Under comma format it means one number, 1.5. Results follow the page's locale, and changing the format keeps and reinterprets your raw text.

Spaces separate observations; they never group thousands. Enter one thousand as 1000. Under point format, 1,000 is the list 1 and 0; under comma format it is the single value 1. Check the interpreted preview and count rather than assuming grouping was detected.

Every explicit zero contributes to the count, while blank lines and repeated separators do not. One invalid nonempty value prevents a result instead of being silently skipped. A one-value list is valid; an empty list has no defined mean.

All observations have equal weight. Unequal course weights, unequal group sizes and differently sized underlying quantities can require a weighted calculation. Whole-journey average speed uses total distance divided by total time, not generally the arithmetic mean of section speeds.

The mean is not the median or mode, and extreme values can move it away from most observations. Exact entered decimals are used throughout; only the mean display is rounded to at most six decimal places. About and signed tiny-result wording remain part of a copied result.

Arithmetic mean examples

For 2, 4 and 6, the count is 3, the sum is 12 and the mean is 4.

For 0 and 10, the count is 2 and the mean is 5. A blank line next to 10 does not add a zero; that list still has one value and a mean of 10.

For −5, 0 and 5, the values cancel exactly and the mean is 0. Negative values are not removed or treated as missing.

With point format, 1,5 has two entries and a mean of 3. With comma format, the same text is one entry with a mean of 1.5. Use the format choice and preview to check your intent.

For 1, 2 and 2, the sum is 5 and the exact mean is 5 divided by 3. The displayed answer is About 1.666667; the repeated 2 is counted twice.

What this calculator does not assume

Use at most 5,000 values and 100,000 raw characters. Each value must be within minus one billion to one billion and have at most four decimal places. Units, percentages, fractions, time strings, exponent notation and grouped digits are not input formats.

This is an equal-weight arithmetic mean, not a weighted, geometric or harmonic mean, median, mode or grading system. It does not combine group averages according to their group sizes.

A correct arithmetic result does not prove the values are comparable or representative. Outliers, unsuitable units or unequal weights can make an unweighted mean misleading.

The result summary does not contain the complete input list. Rounding qualifications do not increase the accuracy of uncertain measurements, and no missing values are invented.

Your list and result

The calculator keeps its list in page memory, without an account, file upload, saved history or input-bearing share link. Copy happens only on request and copies a summary, not the complete list.

The surrounding website can make ordinary requests under its existing consent and analytics settings. Local arithmetic is not whole-site privacy certification.