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Body Temperature Converter (°C ↔ °F)
Convert body temperature between Celsius and Fahrenheit (37°C = 98.6°F), with a quick table and the NHS guide that 38°C (100.4°F) or above is a high temperature.
Body temperature converter (°C ↔ °F)
Type in either box. Normal body temperature is around 36–37°C (96.8–98.6°F), and varies a little through the day.
°C
°F
37.0°C = 98.6°F
98.6°F
Below the NHS high-temperature threshold of 38°C (100.4°F).
When to get help: if a high temperature isn't getting better or is getting worse, contact a doctor or your local health advice line (UK: NHS 111). Call your emergency number if someone is very unwell, confused, has a stiff neck, a rash that doesn't fade under a glass, or trouble breathing. Babies and young children have different rules: check with a health service.
Quick table
35°C = 95.0°F
36°C = 96.8°F
36.5°C = 97.7°F
37°C = 98.6°F
37.5°C = 99.5°F
38°C = 100.4°F
38.5°C = 101.3°F
39°C = 102.2°F
39.5°C = 103.1°F
40°C = 104.0°F
40.5°C = 104.9°F
41°C = 105.8°F
✅ Rules last checked:
📚 Official sources: NHS: Fever in adults
We build every tool from the official rules and re-check them when they change. Always confirm with the official source before you rely on a result.
🛠️ Spotted a mistake or an out-of-date rule? Tell us
Related tools
Questions people ask
What is 37°C in Fahrenheit?+
98.6°F.
What counts as a fever?+
The NHS says a high temperature is usually 38°C (100.4°F) or above.
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