Body Temperature Fever Checker
Interpret body temperature for adults, children, and older adults.
What Is a Normal Body Temperature?
The commonly cited "normal" of 98.6°F (37°C) is an average. In reality, normal body temperature ranges from about 97°F to 99°F and varies by time of day, activity, and age. Older adults tend to run cooler, so a lower threshold for fever applies.
Why Age Matters
Children can spike high fevers quickly, while older adults may show only a mild temperature increase even with serious infections. For seniors, a reading of 99°F or above may be clinically significant and worth reporting to a healthcare provider.
When to Seek Medical Care
Seek immediate care for: infants under 3 months with any fever, temperatures above 103°F, fevers lasting more than 3 days, or fever accompanied by confusion, difficulty breathing, chest pain, or severe headache.
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Disclaimer: This tool is for educational purposes only. Consult a healthcare professional for medical advice.