How does the Hazard Ratio Calculator work?

HR = hazard rate group 1 / hazard rate group 2 Then: HR = 1: same risk Then: HR > 1: group 1 higher risk Then: HR < 1: group 1 lower risk.

Can you give an example of how to use the Hazard Ratio Calculator?

Example: Input Event times gives a result of HR value.

Is the Hazard Ratio Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Hazard Ratio Calculator?

Our Hazard Ratio Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Matematik

Hazard Ratio Calculator

Hazard Ratio (Cox)

Treatment Events

Treatment Time

Control Events

Control Time

Calculates hazard ratio comparing event rates between groups. Key survival analysis metric.

Symbol	Name	Unit	Description
HR	1: same risk	—	1: same risk

Difficulty:advanced

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Did You Know?

Cox regression assumes proportional hazards; violation affects HR interpretation.

References

›Hazard Ratio Calculator

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Hazard Ratio Calculator

Hazard Ratio (Cox)

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Hazard Ratio (Cox)