Fahrenheit To Celsius

Fahrenheit to Celsius Converter

The Fahrenheit to Celsius Converter translates temperature values between the US standard (Fahrenheit) and the metric standard (Celsius) with absolute precision.

How It Works

1. Enter a temperature in Fahrenheit.
2. The calculator immediately subtracts 32 to adjust the freezing point offset.
3. It multiplies the result by 5/9 to account for the difference in scale intervals.

Formula & Calculation Logic

To convert Fahrenheit ($F$) to Celsius ($C$): $C = (F - 32) \times \frac{5}{9}$

To convert Celsius ($C$) to Fahrenheit ($F$): $F = \left(C \times \frac{9}{5}\right) + 32$

Worked Example

Convert a hot summer day of 95°F into Celsius:

1. Subtract 32 from 95: $95 - 32 = 63$
2. Multiply by 5: $63 \times 5 = 315$
3. Divide by 9: $315 / 9 = 35$ Result: 35°C

Result Interpretation

• Reference Points: Water freezes at 32°F (0°C) and boils at 212°F (100°C). Normal human body temperature is roughly 98.6°F (37°C).
• The Intersection: -40°F is exactly equal to -40°C.

FAQs

Is there a quick mental math trick for this?

Yes! To roughly estimate F to C in your head: Subtract 30, then divide by 2. (e.g., 90°F -> 90-30 = 60 / 2 = 30°C. Actual is 32.2°C).

Why do the US and Europe use different scales?

The US retained the Fahrenheit scale from British colonial times, while most of the world adopted the metric system and the Celsius scale (formerly Centigrade) for scientific standardization.

Sources & Last-Reviewed Date

• Sources: International System of Units (SI) derivations.
• Last-Reviewed: 2026-09-03