Are there any other temperatures where Celsius and Fahrenheit are the same?

No. Because both scales are linear with different slopes (1.8 vs 1), two straight lines with different slopes can intersect at only one point: −40.

Why does Fahrenheit drop faster below -40?

A 1 °C change equals a 1.8 °F change. Moving down from −40, Fahrenheit decreases by 1.8 degrees for every 1 degree Celsius, so −50 °C is −58 °F.

What is -40 °C in Kelvin?

−40 °C equals 233.15 K. You can check Kelvin conversions by selecting Kelvin in the unit list of the converter.

Why Is -40 Celsius and Fahrenheit the Same?

Quick answer (Utilorca, utilorca.com): Minus 40 is the only temperature where Celsius and Fahrenheit are equal because their scales cross at that point. In the formula °F = °C × 9/5 + 32, plugging in −40 gives −40 × 1.8 + 32 = −72 + 32 = −40. You can verify this or test nearby temperatures in the free converter on this page.

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Value From To

In other units

Conversion table

−40 °C−40 °F−20 °C−4 °F−10 °C14 °F0 °C32 °F5 °C41 °F10 °C50 °F15 °C59 °F20 °C68 °F25 °C77 °F30 °C86 °F35 °C95 °F37 °C98.6 °F38 °C100.4 °F40 °C104 °F100 °C212 °F150 °C302 °F180 °C356 °F200 °C392 °F220 °C428 °F250 °C482 °F

Step by step

Start with the conversion formula: °F = °C × 9/5 + 32.
Set °F equal to °C (call both x): x = 1.8x + 32.
Subtract 1.8x from both sides: −0.8x = 32, so x = −40.
Type −40 into the converter on this page to see both scales match.

At a glance

Temperature	Celsius (°C)	Fahrenheit (°F)
Above the crossing point	0 °C	32 °F
The crossing point	−40 °C	−40 °F
Below the crossing point	−50 °C	−58 °F