Average Percentage Calculator

What This Average Percentage Calculator Does

Averaging percentages has a trap: you usually cannot just add them up and divide. If you score 50% on a 10-mark quiz and 90% on a 100-mark exam, your real average is not 70% - the big exam should count far more than the little quiz.

That is what a weighted average fixes: each percentage is multiplied by its weight (how much it counts) before averaging. Use a simple average only when every item carries equal weight - same-sized groups, equally-weighted scores, and so on.

Average Percentage Formula

For a simple average, add the percentages and divide by how many there are:

$$\text{average} = \frac{p_1 + p_2 + \cdots + p_n}{n}$$

For a weighted average, multiply each percentage by its weight, then divide by the total weight:

$$\text{weighted average} = \frac{p_1 w_1 + p_2 w_2 + \cdots}{w_1 + w_2 + \cdots}$$

How to Use It

1. Enter your percentages separated by commas.
2. For a weighted average, choose “Weighted average” and enter one weight per percentage, in the same order.
3. Read the average and the steps below it.

Worked Examples

Problem	Steps	Answer
Average of 60%, 75%, 90%	(60 + 75 + 90) / 3 = 225 / 3	75%
Average of 50% and 100%	(50 + 100) / 2 = 150 / 2	75%
Average of 80%, 90%, 75%	(80 + 90 + 75) / 3 = 245 / 3	81.67%
Weighted: 80% (weight 3), 60% (weight 1)	(80 x 3 + 60 x 1) / (3 + 1) = 300 / 4	75%

Common Uses

• Averaging test, quiz, or assignment scores.
• Combining percentages from different sections of a project.
• Working out a weighted grade where some parts count more.
• Averaging survey or rating percentages.

FAQ

How do you average percentages?

Add the percentages together and divide by how many there are. For 60%, 75%, and 90%: $\frac{60 + 75 + 90}{3} = 75\%$.

Can you just average percentages directly?

Yes, when each percentage is out of a same-sized group. If the groups are different sizes, use a weighted average so the larger groups count more.

What is a weighted average percentage?

Each percentage is multiplied by its weight, the results are added, and the total is divided by the sum of the weights. For 80% with weight 3 and 60% with weight 1: $\frac{80 \times 3 + 60 \times 1}{3 + 1} = 75\%$.