Temperature Converter

Temperature converter: Celsius, Fahrenheit, Kelvin, and more

A temperature converter translates a reading from one scale into another without changing the physical heat involved—only the numbers on the dial. You need this when a recipe lists °F but your oven shows °C, when a weather app switches units for travel, or when a lab report mixes Celsius with Kelvin for thermodynamics.

This page updates results as you type. Conversions use standard relationships between scales; they are reference math, not a substitute for calibrated thermometers in regulated work.

How to use this converter

1. Select the scale of your known reading (for example Celsius).
2. Enter the temperature value.
3. Choose the target scale (for example Fahrenheit).
4. Copy the converted value for notes, homework, or kitchen checks.

Before and after examples

Anchor points and everyday reference temperatures.

Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur

Celsius anchors water at 0 °C (freeze) and 100 °C (boil at sea level). Fahrenheit uses 32 °F and 212 °F for the same points—common in the United States for weather and cooking. Kelvin is an absolute scale: 0 K is absolute zero, and room temperature sits near 293 K. Rankine is Fahrenheit shifted to an absolute zero; Réaumur is a historical scale still seen in some European references.

Pick the scale that matches your source label. Converting 37 °C to °F for a fever check is different from converting cryogenic storage in Kelvin—same tool, different anchors.

Conversion formulas (reference)

Celsius to Fahrenheit: °F = (°C × 9/5) + 32. Fahrenheit to Celsius: °C = (°F − 32) × 5/9. Celsius to Kelvin: K = °C + 273.15. Kelvin to Celsius: °C = K − 273.15.

Memorizing every formula is tedious; the converter applies them consistently. For exams, knowing the water triple-point anchors (0 °C = 273.15 K, 32 °F) helps you sanity-check results.

Cooking, weather, and body temperature

Oven settings: 350 °F ≈ 177 °C; 180 °C ≈ 356 °F. A 25 °F difference in baking can matter—always confirm which scale the recipe author used. Weather: a 30 °C summer day is 86 °F; a 0 °C frost is 32 °F.

Medical context: average body temperature is often quoted as 37 °C or 98.6 °F. This tool is not a clinical device; use certified thermometers and professional guidance for diagnosis.

Rounding and significant figures

Results show two decimal places by default—enough for kitchen and homework use. Engineering sign-off may require documented uncertainty from the instrument, not just more decimals on screen.

Absolute zero is −273.15 °C or −459.67 °F. Values below that are non-physical; if your homework allows negative Celsius in a word problem, re-read the prompt before blaming the converter.

Frequently asked questions