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Fahrenheit to Celsius Converter

Convert Fahrenheit to Celsius online: °C = (°F − 32) × 5/9. Essential for US weather, oven temperatures and travel.

Free online · Instant results

Value

From

100 Fahrenheit (°F)37.7778Celsius (°C)

Calculation steps

1Step 1 — °F→°C: (100.00 − 32) × 5/9 = 37.78 °C

Common temperature reference

Reference point	°C	°F	K
Absolute zero	-273.15	-459.7	0.00
°C = °F crossover	-40.00	-40.0	233.15
Freezer	-18.00	-0.4	255.15
Water freezes	0.00	32.0	273.15
Room temperature	25.00	77.0	298.15
Body temperature	37.00	98.6	310.15
Fever (low)	38.00	100.4	311.15
Sauna	80.00	176.0	353.15
Water boils (sea level)	100.00	212.0	373.15
Oven (medium)	180.00	356.0	453.15

Celsius and Fahrenheit scales coincide at −40° (−40°C = −40°F). Kelvin starts at absolute zero and has no negative values; science uses K or °C, the US uses °F in daily life.

Frequently Asked Questions

What is 100°F in Celsius?▼

100°F = 37.78°C. Formula: °C = (°F − 32) × 5/9.

How do I use the Temperature Converter?▼

Open the page and fill in the input fields — results update automatically. Celsius, Fahrenheit and Kelvin.

Are the results accurate?▼

Yes. Standard formulas and conversion factors are used and verified.

Is it free? Do I need to sign up?▼

Completely free. No registration, login or download required.

Does it work on mobile?▼

Yes. The responsive design works on phones, tablets and desktops.

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This is a dedicated variant of the Temperature Converter, pre-configured for this scenario with tailored FAQs.