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Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, and advanced scales (Rankine, Réaumur, Newton).

Main Result

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Celsius

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Fahrenheit

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Kelvin

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Rankine

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Réaumur

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Newton

Free Temperature Converter — Celsius, Fahrenheit, Kelvin & Advanced Scales

Whether you're following an international recipe, checking a weather report from another country, or working through a physics or engineering problem, our free Temperature Converter instantly converts between Celsius, Fahrenheit, Kelvin, and the advanced scales Rankine, Réaumur, and Newton — all shown together in one result.

Why Use This Tool

  • Six scales at once: See Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, and Newton simultaneously.
  • Temperature category: Instantly see if a value is Freezing, Cool, Comfortable, Hot, Very Hot, or Extreme Heat.
  • Quick presets: One-click buttons for freezing, room temperature, body temperature, and boiling.
  • Physically accurate: Prevents impossible results below absolute zero.
  • Instant, no signup: Just type a number and see all conversions immediately.

Key Features

Six Scales

°C, °F, K, °R, °Ré, °N together.

Temperature Category

Instant Cold/Warm/Hot label.

Quick Presets

Freezing, room, body, boiling point.

Conversion Formulas

°C → °F: °F = (°C × 9/5) + 32

°F → °C: °C = (°F − 32) × 5/9

°C → K: K = °C + 273.15

°C → °R (Rankine): °R = (°C + 273.15) × 9/5

°C → °Ré (Réaumur): °Ré = °C × 4/5

°C → °N (Newton): °N = °C × 33/100

Real-Life Temperature Examples

  • 0°C (32°F) — Water freezes
  • 20°C (68°F) — Comfortable room temperature
  • 37°C (98.6°F) — Average human body temperature
  • 100°C (212°F) — Water boils at sea level
  • -40°C = -40°F — The one point where Celsius and Fahrenheit are equal
  • 273.15 K — Equal to 0°C

Absolute Zero Reference

Absolute zero — the coldest possible temperature, where molecular motion theoretically stops — is -273.15°C, equal to -459.67°F and exactly 0 K. This calculator will not return results below this physical limit.

Cooking Temperature Reference

  • 180°C (356°F) — Standard baking temperature
  • 220°C (428°F) — Pizza baking temperature
  • 250°C (482°F) — High-heat grilling

Common Temperature Conversions

  • Celsius to Fahrenheit
  • Fahrenheit to Celsius
  • Celsius to Kelvin
  • Kelvin to Celsius
  • Fahrenheit to Kelvin
  • Kelvin to Fahrenheit

Step-by-Step: How to Use

Step 1: Enter your temperature value.

Step 2: Select the unit you're converting from (Celsius, Fahrenheit, or Kelvin).

Step 3: View all three converted values instantly below.

Benefits

  • Removes the need to memorize or manually calculate conversion formulas.
  • Useful for cooking, travel, science, and everyday weather comparisons.
  • Fast and accurate with zero setup required.

Common Use Cases

  • Converting oven temperatures between Celsius and Fahrenheit recipes.
  • Understanding international weather forecasts.
  • Solving physics and chemistry homework involving Kelvin.
  • Checking body temperature readings from a Fahrenheit thermometer.

Privacy & Security

All conversions run locally in your browser. Recent conversions shown in the sidebar are stored only in your browser's local storage.

Frequently Asked Questions

Why is Kelvin never negative? +
Kelvin starts at absolute zero (-273.15°C), the coldest theoretically possible temperature, so it cannot go below zero.
Rankine is used in US engineering/thermodynamics, Réaumur is a historical scale for education, and Newton appears in some physics references. All three are converted automatically.
A quick label — Freezing, Cool, Comfortable, Hot, Very Hot, or Extreme Heat — based on the Celsius value, to help you interpret the number at a glance.
0°C = 32°F, the freezing point of water.
Approximately 37°C, which equals 98.6°F.
Subtract 32, then multiply by 5/9: C = (F − 32) × 5/9.
It's an absolute scale starting at true zero, convenient for scientific calculations.
100°C, 212°F, and 373.15K at standard pressure.
Yes, it uses standard internationally recognized conversion formulas.
Yes, completely free with no limits.
Recent conversions are saved locally in your browser only.
Yes, except results that would fall below absolute zero, which the tool flags as invalid.

Related Tools

Also try our Weight Converter and Length Converter.

Ready to convert? Enter a temperature above — free and instant.

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