Introduction
The Average Percentage Calculator helps you find the average of two or more percentages quickly and accurately. You can use it in two ways. Simple Average adds up all your percentages and divides by the total count. Weighted Average lets you assign a weight or sample size to each percentage, which is useful when some values matter more than others. For example, if one test is worth more points than another, a weighted average gives you a more accurate result. Just enter your values, click calculate, and get your answer instantly along with a full breakdown of the math.
How to Use Our Average Percentage Calculator
Enter your percentage values to quickly find the simple or weighted average. The calculator will show the average along with helpful stats like the minimum, maximum, median, range, and standard deviation.
Simple or Weighted Mode: Click the "Simple Average" tab if all your percentages count equally. Click the "Weighted Average" tab if some percentages matter more than others based on a weight or sample size. If you need to calculate a weighted average for non-percentage values, our Weighted Average Calculator can help.
Enter Percentages (Simple Mode): Type your percentage numbers into the text box, separated by commas or new lines. The % sign is optional. For example, you can type "85, 90.5, 72" or "85%, 90.5%, 72%".
Percentage (Weighted Mode): Enter each percentage value in the left input field of each row. For example, type "85" if the percentage is 85%.
Weight / Sample Size (Weighted Mode): Enter the weight or sample size for each percentage in the right input field. A higher number means that percentage counts more toward the final average.
Add Another Row: Click this button to add more percentage and weight pairs. You can add up to 25 rows.
Calculate Average: Click this button to see your results. The calculator will display the average percentage, a breakdown of the formula used, summary stats, and a bar chart of your values.
Clear: Click this button to erase all inputs and start over.
What Is an Average Percentage?
An average percentage is the middle value you get when you combine two or more percentages together. To find it, you add up all the percentages and divide by how many there are. For example, if you scored 80%, 90%, and 70% on three tests, the average percentage is (80 + 90 + 70) ÷ 3 = 80%. For general average calculations beyond percentages, you can also use our Average Calculator.
Simple Average vs. Weighted Average
A simple average treats every percentage equally. You just add them up and divide by the total count. This works well when each value matters the same amount, like averaging quiz scores that are all worth the same points. Our Mean Median Mode Calculator can also help you explore these central tendency measures in more detail.
A weighted average is different. It gives more importance to some percentages than others based on a weight or sample size. For example, if one class has 200 students with a 92% pass rate and another has 50 students with a 78% pass rate, the weighted average accounts for the fact that the larger class should count more. The formula is: multiply each percentage by its weight, add those results together, then divide by the total of all weights.
When to Use a Weighted Average
Use a weighted average when the groups behind each percentage are not the same size. Common examples include:
- Combining pass rates from classes with different numbers of students
- Averaging survey results from groups of different sizes
- Calculating a final grade when assignments have different point values — our Grade Calculator and Weighted GPA Calculator are also great tools for this
- Merging conversion rates from marketing campaigns with different traffic amounts
If you use a simple average in these cases, your result can be misleading because smaller groups get the same influence as larger ones.
How to Calculate Average Percentage by Hand
Simple average formula: Add all percentages together, then divide by the number of values.
Weighted average formula: Multiply each percentage by its weight. Add all those products together. Then divide by the sum of all weights.
This calculator does both methods for you instantly and also shows the minimum, maximum, median, range, and standard deviation of your values so you can understand the full picture. If you need to work with other percentage calculations, check out our Percentage Calculator, Percent Change Calculator, Percent Difference Calculator, or Percent Error Calculator.