C↔F ToolCelsius ↔ Fahrenheit

-40°C to Fahrenheit

-40°C is -40.0°F (233.15 K). -40°C equals -40°F — the only temperature where both scales match. A memorable checkpoint for winter travel.

Celsius to Fahrenheit

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

°C

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

Fahrenheit°F
-40.0°F

Celsius

-40.0 °C

Fahrenheit

-40.0 °F

Kelvin

233.1 K

Formula · worked example

°F = -40 × 9/5 + 32 = -40.0

Worked example

°F = -40 × 9/5 + 32 = -40.0

Context: the crossover point. Reverse lookup: -40.0°F to Celsius.

Nearby Celsius values

Quick hops around -40°C

CelsiusFahrenheit
-45°C-49.0°F
-44°C-47.2°F
-43°C-45.4°F
-42°C-43.6°F
-41°C-41.8°F
-40°C-40.0°F
-39°C-38.2°F
-38°C-36.4°F
-37°C-34.6°F
-36°C-32.8°F
-35°C-31.0°F

More tools: Celsius to Fahrenheit · Fahrenheit to Celsius · Oven chart