Celsius to Fahrenheit Calculator — °C to °F Formula

Temperature scales measure heat and cold on different zero points and degree sizes. This converter handles Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine — for weather forecasts, oven settings, lab notes, and travel abroad. Enter a value, pick From and To, and read the result instantly. All calculations run locally in your browser.

Converting between °C and °F is the most common everyday task. Most of the world uses Celsius; the United States primarily uses Fahrenheit. Kelvin is the SI unit for science and engineering.

To convert Celsius to Fahrenheit, multiply by 9/5 and add 32:

°F = (°C × 9/5) + 32

Quick reference points: 0°C = 32°F (water freezes) · 10°C = 50°F · 20°C ≈ 68°F (room temperature) · 37°C ≈ 98.6°F (body temperature) · 40°C = 104°F · 100°C = 212°F (water boils at sea level).

For baking and medical readings, use the exact formula rather than mental shortcuts. Doubling °C and adding 30 is a rough estimate only — it drifts noticeably above 20°C.

To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9:

°C = (°F − 32) × 5/9

Common lookups: 350°F = 176.67°C (common baking temperature) · 0°F ≈ −17.78°C · 32°F = 0°C (freezing point) · 98.6°F ≈ 37°C (body temperature). US oven dials and recipe books in Fahrenheit need this conversion when you work with metric equipment.

Centigrade is the former name for Celsius — same degrees, same zero and hundred points (water freezes at 0° and boils at 100° at standard atmospheric pressure). Older textbooks and some medical devices still say centigrade; the conversion formula is identical.

Body temperature examples: 37°C ≈ 98.6°F · 36.4°C ≈ 97.5°F · 36.7°C ≈ 98.1°F. Clinical thermometers may show either scale depending on region.

Summary of the two everyday conversion paths:

• C → F: multiply by 9/5, add 32
• F → C: subtract 32, multiply by 5/9

These cover weather, cooking, and travel. The offset of 32 accounts for the different zero points — Celsius anchors at water's freezing point; Fahrenheit uses a scale where water freezes at 32° and boils at 212°.

Kelvin is the SI temperature unit. To convert Celsius to Kelvin, add 273.15: K = °C + 273.15. Kelvin to Celsius subtracts 273.15. Because centigrade degrees match Celsius degrees, the same offset applies.

0 K is absolute zero (−273.15°C) — the theoretical point where molecular motion stops. Water freezes at 273.15 K (0°C) and boils at 373.15 K (100°C). Rankine (°R) mirrors Fahrenheit but starts at absolute zero — available in the unit dropdown for engineering thermodynamics.

A static conversion chart lists anchor pairs for quick lookup. This page acts as an interactive chart — change any input instead of reading a fixed poster:

• 0°C = 32°F — water freezing point
• 100°C = 212°F — water boiling point
• 20°C ≈ 68°F — comfortable room temperature
• 37°C ≈ 98.6°F — normal body temperature
• 180°C ≈ 356°F — common baking temperature

Exam questions often ask for 0°C in Fahrenheit (32°F) and 0°F in Celsius (−17.78°C). The reference table below provides more pairs for cooking, weather, and science.