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The Temperature Converter provides instant, accurate conversion between the three major temperature scales: Celsius, Fahrenheit, and Kelvin. Whether you are checking a weather forecast from another country, following a recipe with different temperature units, or working on a scientific calculation, this converter eliminates all guesswork.
Celsius (°C) is the standard temperature scale in most of the world, used for everyday weather, cooking, and science. Fahrenheit (°F) is primarily used in the United States for weather reporting, cooking, and body temperature. Kelvin (K) is the absolute temperature scale used in physics and chemistry — it starts at absolute zero (the coldest possible temperature) and has no negative values.
Temperature conversions are unlike other unit conversions because they involve not just multiplication but also addition and subtraction — a non-linear offset relationship between scales. The freezing point of water is 0°C, 32°F, and 273.15 K. The boiling point is 100°C, 212°F, and 373.15 K. Understanding these reference points helps verify any conversion result.
Temperature conversion uses offset formulas rather than simple multiplication factors, because the zero points of each scale differ.
Converting to Celsius (base):
Converting Celsius to other scales:
The factor 9/5 (= 1.8) represents the ratio of the degree size: one Celsius degree is 1.8 times larger than one Fahrenheit degree. The 32-degree offset reflects that 0°C = 32°F. Kelvin uses the same degree size as Celsius but starts at absolute zero (−273.15°C), the theoretical minimum temperature where all molecular motion stops.
Key reference points for everyday interpretation: 0°C / 32°F / 273.15 K — water freezes; 20–22°C / 68–72°F — comfortable room temperature; 37°C / 98.6°F — normal human body temperature; 100°C / 212°F / 373.15 K — water boils at sea level. A fever is generally above 38°C (100.4°F). Oven temperatures of 180°C correspond to 356°F — a common baking temperature. Negative Kelvin values are physically impossible, so always verify your inputs when converting to Kelvin.
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180°C is a common baking temperature (medium oven), which equals 356°F. US recipes typically list oven temperatures in Fahrenheit, while European recipes use Celsius.
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Normal body temperature of 98.6°F equals exactly 37°C — a direct reference point useful for understanding international medical records.
Use the formula: $$C = (F - 32) \times \frac{5}{9}$$. For example, 98.6°F = (98.6 − 32) × 5/9 = 37°C. A quick mental approximation: subtract 32, then halve the result (slightly underestimates but is useful for everyday estimates).
Absolute zero is 0 K = −273.15°C = −459.67°F. It is the theoretical minimum temperature, where a system has minimum possible thermal energy. It can be approached but never fully reached in practice. The Kelvin scale starts at absolute zero, making it the natural scale for thermodynamic calculations.
Celsius and Fahrenheit are equal at −40 degrees: −40°C = −40°F. This can be verified by the formula: C = (C × 9/5 + 32), solving gives C = −40. This temperature occurs during extreme cold weather events in parts of Canada and Siberia.
The United States adopted the Fahrenheit scale in the 18th century and has maintained it due to cultural inertia and significant infrastructure built around it. A national metrication effort in the 1970s was largely unsuccessful. Most scientific and medical work in the US uses Celsius or Kelvin, while weather forecasts and everyday use remain in Fahrenheit.
Celsius and Kelvin use the same degree size — a change of 1°C equals a change of 1 K. The only difference is the zero point: 0°C = 273.15 K. Kelvin is used in science because it is an absolute scale (no negatives), making it essential for gas laws (PV = nRT) and thermodynamic equations.
A comfortable indoor temperature is typically 20–22°C (68–72°F). Most thermostats in Celsius-using countries are set to 20–21°C in winter, while US thermostats are typically set to 68–72°F. The World Health Organization recommends a minimum indoor temperature of 18°C (64.4°F) for health.
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