Average Percentage Calculator

📊 Average Percentage Calculator

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Percent #2 %

Add more entries? Allow different sample sizes

Average Percentage %

📘 What Is an Average Percentage?

An average percentage is the overall percentage value derived from multiple individual percentages. You can calculate it using a simple mean when all values represent equal weight, or by using the weighted average of percentages when each value comes from a group of different size (i.e., different sample sizes).

🧮 How to Average Percentages

✔ When All Groups Are the Same Size (Simple Average)

Use this method if each percentage represents an equal number of observations.

Formula:

Average Percentage = (p₁ + p₂ + ⋯ + p_n) / n

Example:

If four students scored 70%, 80%, 60%, and 90%, the average of the 4 percentages is:

(70 + 80 + 60 + 90) / 4 = 75%

Use our free mean calculator if you want to average numbers without weights.

✔ When Sample Sizes Are Different (Weighted Average)

This is the correct way to average percentages when each one is based on a different number of people or items.

Weighted Average Percentage Formula:

Weighted Average = (p₁ × w₁ + p₂ × w₂ + ⋯ + p_n × w_n) / (w₁ + w₂ + ⋯ + w_n)

Where:

p is the percentage value
w is the sample size (weight)

Example:

64% of 300 people eat pancakes weekly
42% of 450 people do the same
36% of 250 people also do

Use the formula:

(64 × 300 + 42 × 450 + 36 × 250) / (300 + 450 + 250)
= 47,100 / 1,000 = 47.1%

Use our weighted average calculator above to do this instantly.

📊 Why Sample Size Matters

A common mistake in calculating average percentage is forgetting that sample size affects the outcome. 90% of 10 people isn’t the same as 90% of 1,000 — and the statistical average needs to reflect that. Our tool handles that automatically.

🛠️ Features of Our Average Calculator

📌 Supports up to 10 entries
🎯 Handles both mean of percentages and weighted averages
🧾 Gives a step-by-step breakdown
💡 Helps avoid errors like percent error in reports
🔍 Useful in surveys, education, finance, and statistics

📗 Frequently Asked Questions

How do I calculate the average percentage?
Use the weighted average formula above. If the sample sizes are equal, use the arithmetic average.

Can I average percentages?
Yes, but you must check if each percentage is based on equal or different-sized groups.

How do I add percentages to get an average?
Multiply each percentage by its sample size, sum those products, then divide by the total of all sample sizes.

How can I calculate the average percentage in Excel?
Use:

=SUMPRODUCT(B2:B4, C2:C4)/SUM(C2:C4)

Where column B has percentages and C has sample sizes.

What’s the formula for weighted average of percentages?
See the formula above. Or use our calculator — it’s faster and accurate.

🔍 Try Our Average Percentage Calculator

Skip the manual math. Just enter your percentages and sample sizes above. It works for everything from test scores to survey results and performance metrics.

Average Percentage Calculator