40°C to Fahrenheit
40°C is 104.0°F (313.15 K). 40°C is a high fever if this is body temperature. Seek appropriate medical advice for persistent or severe fever, especially in children.
Celsius to Fahrenheit
Instant two-way conversion with Kelvin and a live scale.
°C
Type to convert · Enter copies · Ctrl/⌘S swaps
Fahrenheit°F
104.0°F
Celsius
40.0 °C
Fahrenheit
104.0 °F
Kelvin
313.1 K
Formula · worked example
°F = 40 × 9/5 + 32 = 104.0
Worked example
°F = 40 × 9/5 + 32 = 104.0
Context: high fever range. Reverse lookup: 104.0°F to Celsius.
Nearby Celsius values
Quick hops around 40°C
More tools: Celsius to Fahrenheit · Fahrenheit to Celsius · Oven chart