Mean Calculator
Calculate the arithmetic mean (average) of any dataset instantly. Also computes median, mode, sum, count, and full descriptive statistics.
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📖 How to Use
Step 1: Enter your numbers separated by commas or spaces. Click "Example" for a demo dataset.
Step 2: Click "Calculate" for instant results with box plot and interpretation.
Step 3: Use "Copy" or "CSV" to export results. Click "Recalculate" to try new data.
What Is the Mean?
The arithmetic mean is the sum of all values divided by the count of values. It is the most commonly used measure of central tendency. Formula: Mean = Sum / N. While intuitive and widely understood, the mean is sensitive to outliers — a single extreme value can shift it significantly.
Mean vs Median
The median is the middle value when data is sorted. Unlike the mean, the median is resistant to outliers. When mean and median are close, the distribution is roughly symmetric. When the mean is much higher than the median, the data is likely right-skewed (pulled by high values). This calculator shows both so you can compare.
When to Use Mean vs Median
Use the mean when data is roughly symmetric and outlier-free. Use the median for skewed data, income distributions, home prices, or any dataset where extreme values distort the average. Many statistical tests assume normally distributed data, where mean and median are approximately equal.
❓ Frequently Asked Questions
What is the formula for mean?
Mean = Sum of all values ÷ Number of values. For example, the mean of 2, 4, 6 is (2+4+6)/3 = 4.
Is mean the same as average?
Yes, in everyday usage 'average' refers to the arithmetic mean. Technically, there are other types of averages (median, mode, geometric mean), but 'average' almost always means the arithmetic mean.
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