Calculate mean, median, mode, standard deviation, and percentiles instantly. Detect outliers, view distribution chart. Free statistics calculator, no signup.
Mean: average of all values (sum ÷ count). Median: middle value when sorted. Mode: most frequent value. Example: [1, 2, 2, 3, 100] — Mean=21.6, Median=2, Mode=2. For skewed data, median is often more representative.
Standard deviation measures how spread out values are from the mean. Low SD = data clustered near the mean. High SD = data widely spread. Formula: square root of the average squared deviation from the mean.
An outlier is a value significantly different from other values. Common rule: values more than 1.5× the interquartile range (IQR) below Q1 or above Q3. Our calculator automatically identifies outliers in your data.
Paste comma-separated numbers (e.g., 12, 45, 67, 23, 89) or space-separated. Our calculator handles both formats and ignores any extra spaces or formatting automatically.
The 50th percentile is the median — 50% of values are below it. The 90th percentile means you are higher than 90% of the data. The 25th (Q1) and 75th (Q3) percentiles define the middle 50% of the data (IQR).
Population SD divides by N and is used when you have all data. Sample SD divides by N-1 and is used when your data is a sample from a larger group. Our calculator shows both values so you can use whichever is appropriate for your analysis.