C↔F ToolCelsius ↔ Fahrenheit

-40°F to Celsius

-40°F is -40.0°C (233.15 K). -40°F equals -40°C — the unique point where Fahrenheit and Celsius read the same.

Fahrenheit to Celsius

Instant two-way conversion with Kelvin and a live scale.

°F

Type to convert · Enter copies · Ctrl/⌘S swaps

Celsius°C
-40.0°C

Celsius

-40.0 °C

Fahrenheit

-40.0 °F

Kelvin

233.1 K

Formula · worked example

°C = (-40 − 32) × 5/9 = -40.0

Worked example

°C = (-40 − 32) × 5/9 = -40.0

Context: the crossover point. Reverse lookup: -40.0°C to Fahrenheit.

Nearby Fahrenheit values

Quick hops around -40°F

FahrenheitCelsius
-45°F-42.8°C
-44°F-42.2°C
-43°F-41.7°C
-42°F-41.1°C
-41°F-40.6°C
-40°F-40.0°C
-39°F-39.4°C
-38°F-38.9°C
-37°F-38.3°C
-36°F-37.8°C
-35°F-37.2°C

More tools: Fahrenheit to Celsius · Celsius to Fahrenheit · Body temperature