Average Calculator
Find the average of any numbers — mean, median, mode and range — plus weighted average and the average of percentages. Just paste or type your values.
How to calculate an average
The average — properly the mean — of a set of numbers is the sum of all the values divided by how many values there are. Add everything up, then divide by the count. This calculator does it the moment you paste or type your numbers, and it also gives you the median, mode, range, sum, count, minimum and maximum so you see the whole picture at once.
mean = (sum of all values) ÷ (count of values)
For example, for 10, 15, 20, 25 and 30 the sum is 100 and there are 5 values, so the mean is 100 ÷ 5 = 20. The median (middle value) is also 20 here, and because every number appears once there is no mode.
Mean vs. median vs. mode
| Measure | What it is | Best when |
|---|---|---|
| Mean | Sum ÷ count | Values are fairly even, no extreme outliers |
| Median | Middle value when sorted | A few very high or low values would skew the mean |
| Mode | Most frequent value | You care about the most common result |
A single very large number pulls the mean up while barely moving the median — which is why house prices and salaries are usually reported as medians. Having all three side by side makes it easy to spot when your data is skewed.
Weighted average and average of percentages
Switch tabs above for two common variations. A weighted average multiplies each value by a weight before averaging — useful for grades, where a final exam counts more than a quiz: (90×3 + 80×2 + 70×1) ÷ (3 + 2 + 1) = 83.3. To average percentages from equal-sized groups, take their plain average — 80%, 90% and 75% average to 81.7%. When the groups differ in size, weight each percentage by its group size instead.
Frequently asked questions
How do you calculate the average?
The average (mean) is the sum of all the numbers divided by how many numbers there are. For example, the average of 10, 15 and 20 is (10 + 15 + 20) ÷ 3 = 45 ÷ 3 = 15. Paste your values above and the calculator does this instantly.
What is the difference between the mean, median and mode?
The mean is the sum divided by the count — the everyday “average”. The median is the middle value once the numbers are sorted (or the average of the two middle ones). The mode is the value that appears most often. They can differ a lot, especially when a few very high or low numbers pull the mean.
How do you find the median?
Sort the numbers from lowest to highest. With an odd count, the median is the middle one; with an even count, it is the average of the two middle values. For 3, 7, 8, 12 the two middle values are 7 and 8, so the median is 7.5.
What is the mode of a set of numbers?
The mode is the value that occurs most frequently. A set can have one mode, several modes (when values tie for most frequent), or no mode at all when every value appears once. This calculator lists every mode it finds.
How do you calculate a weighted average?
Multiply each value by its weight, add those products, then divide by the sum of the weights. For example, grades 90, 80 and 70 with weights 3, 2 and 1 give (90×3 + 80×2 + 70×1) ÷ (3+2+1) = 500 ÷ 6 = 83.3. Use the Weighted tab above to do this automatically.
How do you average percentages?
If each percentage represents an equal-sized group, just take their plain average — add them and divide by how many there are. For example, 80%, 90% and 75% average to (80+90+75) ÷ 3 = 81.7%. When the groups are different sizes, weight each percentage by its group size instead (use the Weighted tab).