38 Celsius to Fahrenheit
38 °C equals 100.4 °F. Change the value, swap Celsius and Fahrenheit, or copy the result with its formula.
Best solution
Default conversion: 38 °C is 100.4 °F; exact result: 100.4 °F.
Temperature reading · up to 2 decimal places
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Calculation for 38 °C
(38 × 9/5) + 32 = 68.4 + 32 = 100.4 °F.
For this input, 100.4 °F is exact; no decimal rounding is needed.
For a temperature reading, use °F = °C × 9/5 + 32, or °C = (°F − 32) × 5/9. Results are displayed to at most two decimal places. Negative values are allowed down to −273.15 °C or −459.67 °F (absolute zero). The calculator converts readings, not temperature changes: a change of 1 °C is a change of 1.8 °F, with no 32-degree offset. NIST temperature conversion reference.
Changing the input updates the calculator only; the worked example below it stays on the value named in this page. Swap uses the displayed, rounded result as the next input, so repeated swaps may introduce a small rounding difference. Unit conversion does not determine a diagnosis or a recommended device setting.
Real-World Context & Technical Standards
Official Clinical Fever Definition
The World Health Organization, CDC, and American Academy of Pediatrics define clinical fever as a body temperature reaching or exceeding 38.0 °C (100.4 °F).
Infant Fever Action Threshold
For infants under 3 months of age, any core temperature of 38.0 °C or higher requires immediate professional medical evaluation.
Related conversions
Frequently Asked Questions
How do I convert 38 °C to °F?
(38 × 9/5) + 32 = 68.4 + 32 = 100.4 °F.
Is 100.4 °F exact or rounded?
For this input, 100.4 °F is exact; no decimal rounding is needed.