Skewness Calculator
Measure the lean of a distribution, left or right.
Enter your values
Enter the data values you are working with.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Skewness (g₁)
- 1.4124
- Adjusted Fisher-Pearson skew
- 1.6749
- Direction
- Right-skewed (long right tail)
- Strength
- Highly skewed
- Pearson's second coefficient
- 1.1641
- Mean vs median
- 5.5 vs 4
Quick answer
Skewness measures asymmetry: a positive value means a long right tail, a negative value a long left tail, and zero a symmetric distribution.
g₁ = Σ(x − x̄)³ ÷ (n·s³)
At a glance
| What it does | Measure the lean of a distribution, left or right. |
|---|---|
| Category | Statistics |
| Inputs needed | Data values |
| Main output | Skewness (g₁) |
| Formula | g₁ = Σ(x − x̄)³ ÷ (n·s³) |
| Cost | Free — no sign-up, no download |
How to use the Skewness Calculator
- 1Paste your dataset.
- 2Read the sign for direction and the magnitude for strength.
- 3Cross-check with the mean-versus-median gap, which points the same way.
Inputs explained
- Data values
- Enter the data values you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Data values2, 3, 3, 4, 4, 4, 5, 6, 9, 15
Results
- Skewness (g₁)1.4124
- Adjusted Fisher-Pearson skew1.6749
- DirectionRight-skewed (long right tail)
- StrengthHighly skewed
- Pearson's second coefficient1.1641
- Mean vs median5.5 vs 4
Frequently asked questions
What counts as badly skewed?
Beyond ±1 is usually considered high; many tests assume roughly symmetric data, so consider a log transform.
Which formula do you use?
Both: the moment coefficient g₁ and the adjusted Fisher-Pearson version that Excel's SKEW function reports.
What do I need to enter into the Skewness Calculator?
Just 1 value: data values. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Skewness Calculator work out the answer?
Skewness measures asymmetry: a positive value means a long right tail, a negative value a long left tail, and zero a symmetric distribution. It applies the formula g₁ = Σ(x − x̄)³ ÷ (n·s³) and shows the working so you can check each step by hand.
Is the Skewness Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.