System Usability Scale Calculator for Engineering Teams

SUS Input Form

Complete all ten statements using the standard 1–5 response scale. Results appear above this form after submission.

1
Strongly Disagree

2
Disagree

3
Neutral

4
Agree

5
Strongly Agree

System or Product Name

Study or Project Name

Respondent Label

Test Date

Benchmark Score

Previous SUS Score (Optional)

I think that I would like to use this system frequently.

I found the system unnecessarily complex.

I thought the system was easy to use.

I think that I would need support to use this system.

I found the functions well integrated.

I thought there was too much inconsistency in this system.

I imagine most people would learn this system quickly.

I found the system very cumbersome to use.

I felt very confident using the system.

I needed to learn many things before using this system.

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Example Data Table

The table below shows sample respondent inputs and final SUS scores for quick reference.

Respondent	Q1	Q2	Q3	Q4	Q5	Q6	Q7	Q8	Q9	Q10	SUS Score
Tester A	4	2	4	2	5	2	4	1	5	2	82.5
Tester B	3	3	3	3	4	3	3	3	4	3	55.0
Tester C	5	1	5	2	4	1	5	2	5	1	92.5

Formula Used

The System Usability Scale uses ten items rated from 1 to 5. Odd-numbered items are positive statements, and even-numbered items are negative statements.

Odd items: contribution = response − 1
Even items: contribution = 5 − response
Raw total: sum of all ten contributions
Final SUS score: raw total × 2.5

This converts the score to a 0–100 scale. Higher scores indicate better perceived usability.

How to Use This Calculator

Enter the system name, study label, benchmark, and optional previous score.
Rate all ten SUS statements from 1 to 5.
Click Calculate SUS Score to generate the score.
Review the score, grade, acceptability, benchmark gap, and item-level contributions.
Use the chart to identify which items improved or weakened the experience.
Download CSV or PDF outputs for engineering reviews, audits, or design reports.

Frequently Asked Questions

1. What does the SUS score measure?

It measures perceived usability from a short standardized questionnaire. The score reflects how easy, consistent, and confidence-building the system feels to respondents.

2. Is a higher SUS score always better?

Yes. Higher scores generally indicate stronger usability. Teams often compare releases, prototypes, or competitor workflows using the same scoring method.

3. Why are even-numbered items reversed?

Even items are negatively worded. Reversing them keeps all adjusted contributions aligned so stronger usability always raises the final score.

4. Is 68 still a useful benchmark?

It is widely used as a practical average reference point. Still, your own historical scores and domain-specific expectations should guide final decisions.

5. Can I score one respondent at a time?

Yes. This calculator scores one response set per submission. For team studies, average several respondent scores to make stronger conclusions.

6. What does response variation tell me?

Variation shows how spread out the answers were. Higher variation can signal uneven experiences, confusing flows, or uncertainty across items.

7. Should SUS replace qualitative usability testing?

No. SUS summarizes perception efficiently, but comments, observations, and task success data explain why the score moved.

8. What are CSV and PDF exports useful for?

They help store results, share findings with stakeholders, and attach evidence to engineering reviews, release notes, and usability documentation.