Visual guide to fever temperatures in both Celsius and Fahrenheit
Status Celsius (°C) Fahrenheit (°F) Adult Advice Child Advice Hypothermia 105.8°F Medical emergency Medical emergency Fever Guides by Age Group 👨⚕️ Adult Fever Guide Normal adult body temperature variations Typical signs of fever in adults Clear indicators for when to seek medical care Fever management and medication guidelines View Adult Fever Temperature Chart & Guidelines 👶 Child & Infant Fever Guide Age-based fever thresholds (0–3 months, 3–12 months, 1–12 years) Special considerations for children Recognizing and managing febrile seizures When to call the pediatrician View Child Fever Temperature Chart & Care Guide Fever Temperature FAQs What temperature is considered a fever?A body temperature of 38.0°C (100.4°F) or higher is generally considered a fever. Different measurement methods (oral, ear, rectal, forehead) may show slight variations.
What is the normal body temperature in C to F?The normal body temperature range for healthy adults is typically between 36.1°C (97.0°F) and 37.2°C (99.0°F). This can vary slightly depending on factors such as time of day, activity level, age, and measurement method. For children, the normal range may be slightly higher, usually between 36.4°C (97.5°F) and 37.5°C (99.5°F).
Is 37.5°C (99.5°F) a fever?This is a borderline temperature, sometimes called a "low-grade" rise. Monitor symptoms and watch for changes. It's not typically considered a true fever but may indicate the beginning of an illness.
When should I see a doctor for fever?Adults: fever lasting more than 3 days, temperature over 39.4°C (103°F), or accompanied by severe headache, rash, shortness of breath, or stiff neck. Children: any fever in infants under 3 months, high fever that doesn't respond to medication, or fever with lethargy, irritability, or unusual rash.
What is the normal body temperature for adults?The typical range is 36.5–37.5°C (97.7–99.5°F). Temperature can vary due to time of day, physical activity, hormonal changes, and individual differences.
How do I convert Celsius to Fahrenheit for fever?Formula: (°C × 9/5) + 32 = °F. Example: 38°C = (38 × 9/5) + 32 = 100.4°F. Use our Celsius to Fahrenheit Calculator for quick conversions.
Is 100.2°F a fever in adults?100.2°F (37.9°C) is slightly above normal body temperature but below the standard fever threshold of 100.4°F (38°C). It may indicate a low-grade fever or the beginning of an illness and should be monitored.
How to Measure Body Temperature Accurately Method Normal Range Best For Notes Oral 36.5–37.5°C Adults, older children Avoid within 30 min after eating/drinking Axillary (armpit) 35.9–36.7°C All ages Usually 0.5–1.0°C lower than core temperature Ear (tympanic) 35.8–38.0°C 6 months+ Earwax may affect accuracy Forehead (temporal) 35.8–37.8°C Quick screening May be influenced by environment Printable Fever Temperature Chart (PDF)Download our one-page quick reference guide for easy access at home or on your mobile device.
Download PDF Chart Important Medical DisclaimerDisclaimer: This guide is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment. If you or your child has a high fever, persistent fever, or symptoms like lethargy, difficulty breathing, or rash, consult a doctor or seek emergency medical care. This information is based on public medical guidelines, but individual circumstances may vary. Always follow the guidance of healthcare professionals.
Medical Authority & TransparencyContent Review: This content is based on the latest medical guidelines and is regularly reviewed by our team.
Last Updated: Last medically reviewed: September 2025
Reference Sources: This guide synthesizes standards from authoritative organizations: Centers for Disease Control and Prevention (CDC) Fever Guidelines, World Health Organization (WHO) Child Fever Management, American Academy of Pediatrics (AAP) Infant Fever Clinical Reports, Mayo Clinic Fever Symptoms & Treatment.
Page last updated: September 28, 2025