Body Temperature: Celsius to Fahrenheit
Convert body temperature from Celsius to Fahrenheit. Understand fever ranges, normal temperature, and when to seek medical care.
Celsius → Fahrenheit
Body Temperature Reference Chart
Understanding Body Temperature
Normal human body temperature is 37°C (98.6°F), but this can vary by up to 0.5°C (0.9°F) depending on the individual, time of day, and measurement location. Body temperature is typically lowest in the early morning and highest in the late afternoon.
Temperature measurement methods
- Oral (mouth): Most common, normal range 36.5–37.5°C (97.7–99.5°F)
- Rectal: Most accurate, reads about 0.5°C higher than oral
- Axillary (armpit): Reads about 0.5°C lower than oral
- Ear (tympanic): Quick and convenient, similar to oral
- Forehead (temporal): Non-contact, convenient for children
Fever thresholds by age
- Newborns (0–3 months): Any temperature ≥ 38°C (100.4°F) — seek immediate care
- Infants (3–12 months): ≥ 38°C (100.4°F) — consult doctor
- Children (1–17 years): ≥ 38°C (100.4°F) — monitor; seek care if ≥ 39.4°C (103°F)
- Adults: ≥ 38°C (100.4°F) — fever; seek care if ≥ 39.4°C (103°F) or lasting > 3 days
Frequently Asked Questions
What is normal body temperature in Fahrenheit?
Normal body temperature is 98.6°F (37°C). However, normal temperature can range from 97°F (36.1°C) to 99°F (37.2°C) depending on the individual, time of day, and measurement method.
What temperature is considered a fever in Fahrenheit?
A fever is generally defined as a body temperature of 100.4°F (38°C) or higher. A low-grade fever is between 99.5°F (37.5°C) and 100.3°F (38°C).
What is 37.5°C in Fahrenheit?
37.5°C equals 99.5°F. This is considered a low-grade fever in adults.
What is 38°C in Fahrenheit?
38°C equals 100.4°F. This is the threshold for a clinical fever according to most medical guidelines.
What is 39°C in Fahrenheit?
39°C equals 102.2°F. This is a high fever that typically requires medical attention, especially in children.
When should I see a doctor for a fever?
Adults should seek medical care if fever exceeds 103°F (39.4°C) or lasts more than 3 days. For children under 3 months, any fever above 100.4°F (38°C) requires immediate medical attention.