Statistiques et probabilités

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Decile Calculator.

Calculate an interpolated decile from a numeric sample.

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Sample values

Decile (1–9)

decile

5,000000

Valeur

15,500000

Results update automatically as you type.

Use Cases

Analyze score distributions

Teachers and students can quickly find deciles for test scores to understand performance spread, e.g., the 9th decile shows the top 10% threshold.

Example: Enter scores like 55, 67, 78, 89, 92 and choose Decile 9 to see the cutoff for the top 10%.

Segment income or sales data

Business analysts can use deciles to segment customers or regions by income or sales, helping to identify high and low performers.

Example: Enter monthly sales figures and select Decile 5 to find the median sales value.

Frequently Asked Questions

What is a decile?: A decile is a quantile that divides a sorted dataset into ten equal parts. The k-th decile (D1 to D9) indicates the value below which k*10% of the data falls. For example, D3 is the value below which 30% of observations lie.
How is the decile calculated in this calculator?: The calculator uses a standard formula: sort your sample values in ascending order, then compute the position using the formula: position = (k/10) * (n + 1), where k is the decile number (1–9) and n is the number of values. If the position is not an integer, it interpolates between the two nearest data points.
Can I use this calculator for any type of data?: Yes, you can use it for any numerical dataset, such as test scores, income, or measurements. Just enter your sample values separated by commas or spaces, select the decile you need, and the calculator will compute the result instantly.

Tips & Common Mistakes

Tips

Enter your sample values separated by commas or spaces. For example: 10, 20, 30, 40, 50.
Choose the decile number (1–9) that matches the percentile you need. Decile 1 is the 10th percentile, Decile 5 is the 50th percentile (median), and Decile 9 is the 90th percentile.
The calculator updates results instantly as you type, thanks to debounced input. This allows you to experiment with different deciles without pressing a button.
Ensure your data is numeric and free of text or symbols. Non-numeric entries may cause errors or be ignored.

Common Mistakes to Avoid

Entering values in descending order – the calculator sorts them automatically, but it's good to know that the decile is based on sorted data.
Selecting a decile outside the 1–9 range – the calculator only supports deciles 1 through 9, as decile 0 and 10 are not defined.
Using a comma as a decimal separator – if your locale uses commas for decimals, use periods instead, or separate values with spaces to avoid confusion.

Last updated: August 13, 2026

Use Cases

Analyze score distributions

Teachers and students can quickly find deciles for test scores to understand performance spread, e.g., the 9th decile shows the top 10% threshold.

Example: Enter scores like 55, 67, 78, 89, 92 and choose Decile 9 to see the cutoff for the top 10%.

Segment income or sales data

Business analysts can use deciles to segment customers or regions by income or sales, helping to identify high and low performers.

Example: Enter monthly sales figures and select Decile 5 to find the median sales value.

Frequently Asked Questions

What is a decile?

A decile is a quantile that divides a sorted dataset into ten equal parts. The k-th decile (D1 to D9) indicates the value below which k*10% of the data falls. For example, D3 is the value below which 30% of observations lie.

How is the decile calculated in this calculator?

The calculator uses a standard formula: sort your sample values in ascending order, then compute the position using the formula: position = (k/10) * (n + 1), where k is the decile number (1–9) and n is the number of values. If the position is not an integer, it interpolates between the two nearest data points.

Can I use this calculator for any type of data?

Yes, you can use it for any numerical dataset, such as test scores, income, or measurements. Just enter your sample values separated by commas or spaces, select the decile you need, and the calculator will compute the result instantly.

Tips & Common Mistakes

Tips

Enter your sample values separated by commas or spaces. For example: 10, 20, 30, 40, 50.
Choose the decile number (1–9) that matches the percentile you need. Decile 1 is the 10th percentile, Decile 5 is the 50th percentile (median), and Decile 9 is the 90th percentile.
The calculator updates results instantly as you type, thanks to debounced input. This allows you to experiment with different deciles without pressing a button.
Ensure your data is numeric and free of text or symbols. Non-numeric entries may cause errors or be ignored.

Common Mistakes to Avoid

Entering values in descending order – the calculator sorts them automatically, but it's good to know that the decile is based on sorted data.
Selecting a decile outside the 1–9 range – the calculator only supports deciles 1 through 9, as decile 0 and 10 are not defined.
Using a comma as a decimal separator – if your locale uses commas for decimals, use periods instead, or separate values with spaces to avoid confusion.

Use Cases

Analyze score distributions

Teachers and students can quickly find deciles for test scores to understand performance spread, e.g., the 9th decile shows the top 10% threshold.

Example: Enter scores like 55, 67, 78, 89, 92 and choose Decile 9 to see the cutoff for the top 10%.

Segment income or sales data

Business analysts can use deciles to segment customers or regions by income or sales, helping to identify high and low performers.

Example: Enter monthly sales figures and select Decile 5 to find the median sales value.

Frequently Asked Questions

What is a decile?

How is the decile calculated in this calculator?

Can I use this calculator for any type of data?

Tips & Common Mistakes

Tips

Enter your sample values separated by commas or spaces. For example: 10, 20, 30, 40, 50.
Choose the decile number (1–9) that matches the percentile you need. Decile 1 is the 10th percentile, Decile 5 is the 50th percentile (median), and Decile 9 is the 90th percentile.
The calculator updates results instantly as you type, thanks to debounced input. This allows you to experiment with different deciles without pressing a button.
Ensure your data is numeric and free of text or symbols. Non-numeric entries may cause errors or be ignored.

Common Mistakes to Avoid

Entering values in descending order – the calculator sorts them automatically, but it's good to know that the decile is based on sorted data.
Selecting a decile outside the 1–9 range – the calculator only supports deciles 1 through 9, as decile 0 and 10 are not defined.
Using a comma as a decimal separator – if your locale uses commas for decimals, use periods instead, or separate values with spaces to avoid confusion.