Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Calculate the simple average of a list of percentage values.
This tool calculates the simple (unweighted) average of a list of percentage values -- add them up and divide by how many there are. If your percentages represent groups of different sizes (e.g. different class sizes), a weighted average is more accurate -- see the Weighted Average Calculator for that case.
Enter your percentage values separated by commas. The average appears instantly.
The tool splits your text on commas and line breaks, converts each piece to a number and averages the numbers it recognizes: it adds them up and divides by how many there are. The result is shown with two decimals and a label saying how many values were used. Pieces that are not numbers, such as words, are skipped. Nothing is weighted, and values are not limited to the range 0 to 100, so a 120 or a negative figure would be included as typed.
Average = (sum of all values) / (number of values)
These values are hypothetical.
Because of how the input is read, a trailing comma or an extra empty line at the end of your list can be read as an empty entry, which is counted as zero and drags the average down. Similarly, a line that contains only a space can be counted as zero. The label under the result shows how many values were included, so compare that count with the number of percentages you intended. If it is one too many, remove the trailing separator or blank line. Consecutive commas or line breaks are treated as a single separator, so they are less of a problem than a dangling one at the end. A percent sign attached to a value, such as 85%, makes that piece non-numeric, so it is skipped rather than counted; type the plain number instead.
An average hides the spread. Averages of 75 from 74, 75 and 76 are very different from 75 built from 50, 100 and 75, so look at the values as well as the mean. If your average feeds a decision such as a course grade, check the syllabus for how grades are officially combined, since teachers often drop the lowest score or weight assessments.
Use this simple average when every percentage represents an equally-sized group. If the groups differ in size (e.g. averaging pass rates across classes of different student counts), use the Weighted Average Calculator instead for an accurate result.
A trailing comma, blank line or space-only line may have been counted as a zero. Check the value count under the result and remove any stray separators.
No. An entry such as 85% is not read as a number and is skipped. Type 85 instead.
No, the tool averages whatever numbers you provide, including values above 100 or below 0, so verify your data.
This tool gives each percentage equal influence. If groups differ in size, the combined percentage is a weighted average, which needs the group sizes.
Reference: NIST Weights and Measures