To calculate the SUS score, first sum the score contribution from each item. each item's score contribution will range from 0 to 4. for items 1, 3, 5, 7, and 9 the score contribution is the scale position minus 1. for items 2, 4, 6, 8 and 10, the contribution is 5 minus the scale position. multiply the sum of the scores by 2.5 to obtain the overall value of SUS.

To calculate the SUS (System Usability Scale) score, follow these steps:

1. **Determine the score contribution for each item:**
   - For items 1, 3, 5, 7, and 9 (odd-numbered items), the score contribution is calculated by subtracting 1 from the scale position (the value the respondent selected for that item).
   - For items 2, 4, 6, 8, and 10 (even-numbered items), the score contribution is calculated by subtracting the scale position from 5.

2. **Sum the score contributions** from all 10 items.

3. **Multiply the sum of the scores by 2.5** to obtain the final SUS score.

### Example:

Let's assume the responses to the 10 items are as follows (on a scale of 1 to 5):

- Item 1: 4
- Item 2: 3
- Item 3: 5
- Item 4: 2
- Item 5: 4
- Item 6: 3
- Item 7: 4
- Item 8: 1
- Item 9: 5
- Item 10: 2

**Step 1: Calculate the score contributions:**

- Item 1: \( 4 - 1 = 3 \)
- Item 2: \( 5 - 3 = 2 \)
- Item 3: \( 5 - 1 = 4 \)
- Item 4: \( 5 - 2 = 3 \)
- Item 5: \( 4 - 1 = 3 \)
- Item 6: \( 5 - 3 = 2 \)
- Item 7: \( 4 - 1 = 3 \)
- Item 8: \( 5 - 1 = 4 \)
- Item 9: \( 5 - 1 = 4 \)
- Item 10: \( 5 - 2 = 3 \)

**Step 2: Sum the scores:**

\( 3 + 2 + 4 + 3 + 3 + 2 + 3 + 4 + 4 + 3 = 31 \)

**Step 3: Multiply the sum by 2.5:**

\( 31 \times 2.5 = 77.5 \)

So, the SUS score in this example is **77.5**.

Would you like to explore more examples, or do you have any questions?

### Related Questions:
1. How is the SUS score interpreted in terms of usability?
2. What is a "good" SUS score, and how does it compare to industry benchmarks?
3. How does the SUS scale differ from other usability measurement tools?
4. Can SUS scores be used to compare different versions of a product?
5. What are the limitations of using the SUS score for usability testing?

**Tip:** When interpreting SUS scores, remember that they are generally considered reliable for assessing overall usability, but they should be used alongside other qualitative feedback for a complete evaluation.

Learn how to calculate the SUS (System Usability Scale) score with a detailed step-by-step guide and example. Understand the formula used to compute the SUS score and its application in usability testing.

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