SSL/TLS Security Score Calculator

Calculate a comprehensive security score for your SSL/TLS configuration

Domain

Port

Security Score

About SSL Security Score

Calculates a comprehensive security score (0-100) for a server's SSL/TLS configuration. Weighs certificate strength, protocol support, cipher suite selection, and security features.

How to Use

1Enter the domain name and optional port number.
2Click "Calculate Score" to analyze the SSL/TLS configuration.
3Review the overall score and detailed breakdown by category.

Use Cases

•Security benchmarking to compare SSL configurations across servers
•Compliance verification against security standards and policies
•Improvement tracking to measure the impact of configuration changes

Frequently Asked Questions

The score is calculated by evaluating multiple factors: certificate strength (key size, signature algorithm), protocol support (TLS 1.3 bonus), cipher suite quality, and presence of security features like HSTS and OCSP stapling.

The biggest score impacts come from: weak or deprecated protocols (SSL 2.0/3.0, TLS 1.0), weak cipher suites (RC4, DES, 3DES), missing forward secrecy, and certificate issues (short key, weak signature).

Enable TLS 1.3 and 1.2 only, use strong cipher suites with forward secrecy, obtain certificates with 2048-bit or larger keys, enable OCSP stapling, and implement HSTS headers.

Most likely because this measures a single real handshake, while a full scanner deliberately tries every protocol version and cipher suite in turn. A server that offers a modern configuration but still permits TLS 1.0 looks excellent to a default client and poor to a scanner, and neither number is wrong: yours describes what a visitor actually gets, the scanner's describes the worst case available. If the two disagree by much, the gap itself is the finding worth acting on.

It is recorded as an issue in its own right rather than folded into a transport score, because it is a different kind of problem. Every other item measures the quality of the connection; an expired certificate means there is no valid connection at all, and no cipher configuration can compensate for it. Treat it as a blocking failure and score as a description of what you will see once it is fixed.

No, and it is worth being precise about what is being measured. The score describes the TLS transport: protocol version, cipher suite, key exchange and certificate validity. It says nothing about the application layer, which is where most real breaches occur — injection, access control, dependency vulnerabilities and exposed data. A perfect score means the connection is well built, not that the site is safe. Read it as one component of a security assessment rather than a verdict on one.

Servers behind a load balancer or CDN commonly serve different certificates and configurations depending on which edge you reach, so two requests can land on nodes configured at different times. A certificate rotation in progress produces exactly this. If the score fluctuates rather than settling, that is worth finding out about — it usually means the fleet is inconsistent, and any visitor can be routed to the weaker node.

How the Score Is Calculated

The score is derived from what the connection actually negotiates, not from what the server claims to support. That distinction matters, because a server can be configured for TLS 1.3 and still downgrade a particular client.

1Complete a real handshake and read the protocol version and cipher suite that were selected.
2Read the certificate and check the dates. An expired certificate and one expiring soon are separate findings, because the first is an outage and the second is a scheduled task.
3Flag a deprecated protocol version if one was negotiated, rather than assuming the best case applies.
4Convert the findings into a score and list every issue, so the number can be acted on rather than merely observed.

Read the issue list, not the score. Two servers can score the same while one has a single critical finding hidden among cosmetic ones and the other has only minor items, and the total alone cannot tell them apart.

Tips & Best Practices

•Track security scores over time to measure improvement
•Focus on low-scoring categories for maximum improvement impact
•Use security scores for benchmarking against industry standards
•Set score targets and monitor progress toward security goals

Technical Details

Scoring: Weighted security scoring based on multiple factors
Factors: Certificate, protocol, cipher, header, and vulnerability scores
Grading: A-F grading based on security assessment
Output: Security score with detailed breakdown and recommendations