ewory.com logo

Temperature Converter

Select the temperature unit, enter the value and instantly get the result in all three units.

Celsius (°C)

Celsius

Fahrenheit

Kelvin

Temperature Converter – Fahrenheit, Celsius & Kelvin

Whether you're checking a weather forecast from another country, following a recipe written in Celsius, or studying thermodynamics, converting between temperature scales is a daily necessity. This tool instantly converts between Fahrenheit, Celsius, and Kelvin so you never have to do the math by hand.

Temperature Scales Explained

Temperature is measured using three main scales, each designed for different purposes:

ScaleZero PointPrimary Usage
Fahrenheit (°F)Brine freezing point (~0 °F)Everyday use in the United States — weather, cooking, HVAC
Celsius (°C)Freezing point of water (0 °C)Everyday use worldwide — weather, science, medicine outside the US
Kelvin (K)Absolute zero (−273.15 °C)Science, physics, chemistry, engineering

The United States is one of only a few countries that still uses Fahrenheit for daily life. Most of the world — and all scientific research — uses Celsius or Kelvin.

Conversion Formulas

Fahrenheit → Celsius: °C = (°F − 32) × 5/9

Celsius → Fahrenheit: °F = (°C × 9/5) + 32

Celsius → Kelvin: K = °C + 273.15

Fahrenheit → Kelvin: K = (°F − 32) × 5/9 + 273.15

Worked Example

Convert 72 °F (a typical US room temperature) to Celsius:

  1. Subtract 32: 72 − 32 = 40
  2. Multiply by 5/9: 40 × 5/9 = 22.2 °C

Convert 180 °C (a common European oven setting) to Fahrenheit:

  1. Multiply by 9/5: 180 × 9/5 = 324
  2. Add 32: 324 + 32 = 356 °F

Key Reference Temperatures

Situation°F°CK
Absolute zero−459.67−273.150
Water freezes320273.15
Room temperature7222.2295.4
Body temperature98.637310.15
Water boils212100373.15
Oven — low325163436
Oven — medium375190464
Oven — high450232505

Cooking Temperature Conversions

Recipes from European, British, or Australian sources use Celsius, while American recipes use Fahrenheit. Here's a quick cooking reference:

Cooking Task°F°C
Slow roast / dehydrate200 – 25095 – 120
Baking bread350 – 425175 – 220
Roasting chicken375 – 425190 – 220
Pizza450 – 500230 – 260
Broiling / grilling500+260+
Internal temp — medium-rare steak130 – 13554 – 57
Internal temp — chicken (safe)16574

The USDA recommends using a food thermometer to ensure meats reach safe internal temperatures.

Quick Mental Math Tricks

  • °F → °C shortcut: Subtract 30, divide by 2. Example: 86 °F → (86 − 30) / 2 = 28 °C (actual: 30 °C). Close enough for weather estimates.
  • °C → °F shortcut: Double the Celsius, add 30. Example: 25 °C → (25 × 2) + 30 = 80 °F (actual: 77 °F).
  • The crossover: Celsius and Fahrenheit are equal at exactly −40° — the same reading on both scales.

Why Does Kelvin Have No Degree Symbol?

Kelvin is not a "scale" in the traditional sense — it is the SI base unit of temperature. That's why scientists write "300 K," not "300 °K." Kelvin starts at absolute zero, the theoretical lowest temperature where all molecular motion ceases. It is essential in physics, chemistry, and engineering calculations like the ideal gas law (PV = nRT).

Frequently Asked Questions

How do I convert Fahrenheit to Celsius?

Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. Formula: °C = (°F − 32) × 5/9. For example, 98.6 °F = (98.6 − 32) × 5/9 = 37 °C.

How do I convert Celsius to Fahrenheit?

Multiply the Celsius temperature by 9/5, then add 32. Formula: °F = (°C × 9/5) + 32. For example, 100 °C = (100 × 9/5) + 32 = 212 °F.

What is absolute zero in Fahrenheit and Celsius?

Absolute zero is the coldest possible temperature: −273.15 °C (−459.67 °F) or 0 Kelvin. At this temperature, all molecular motion theoretically stops. It has never been fully reached in a laboratory.

What is normal human body temperature?

Normal human body temperature averages 98.6 °F (37 °C), though recent studies suggest the modern average is closer to 97.9 °F (36.6 °C). A fever is generally defined as 100.4 °F (38 °C) or above.

What is the difference between Celsius, Fahrenheit, and Kelvin?

Fahrenheit (used in the US) sets water's freezing point at 32 °F and boiling at 212 °F. Celsius (metric, used worldwide) uses 0 °C and 100 °C. Kelvin is the scientific absolute scale starting at 0 K (absolute zero), with the same degree size as Celsius.

Related Tools

Sources