Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, and Rankine with formulas and instant results.

Value

From

Temperature Reference Points

Description	°C	°F	K
Water boiling point	100	212	373.15
Body temperature	37	98.6	310.15
Room temperature	20–22	68–72	293–295
Water freezing point	0	32	273.15
Absolute zero	−273.15	−459.67	0

Frequently Asked Questions

Use the formula: °F = (°C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F. The reverse is: °C = (°F − 32) × 5/9.

Absolute zero is the lowest theoretically possible temperature — 0 Kelvin = −273.15°C = −459.67°F. At absolute zero, particles have the minimum possible kinetic energy. It has been approached but never fully achieved in a laboratory.

Kelvin is the SI base unit of temperature. It starts at absolute zero and uses the same scale increment as Celsius. Convert: K = °C + 273.15. Kelvin is used in science, engineering, and astrophysics because it is an absolute (thermodynamic) scale with no negative values.

Rankine is an absolute temperature scale that uses Fahrenheit-sized degrees. °R = °F + 459.67. Absolute zero is 0°R. It is used in some engineering fields in the United States, particularly in thermodynamics calculations that require an absolute scale but use Fahrenheit units.

How It Works

Enter Temperature

Type any temperature value. Negative values are supported for sub-zero temperatures.

Select Scale

Choose the input scale and target scale. Unlike other converters, temperature uses formulas not simple multiplication.

See Result & Formula

The result and the conversion formula are displayed instantly so you can learn and verify the calculation.

Common Use Cases

Weather & Travel

Convert weather forecasts between Celsius and Fahrenheit when traveling internationally or following news from other countries.

Cooking & Baking

Convert oven temperatures between Celsius and Fahrenheit when following recipes from different countries or using imported kitchen equipment.

Medical & Body Temperature

Convert body temperature readings between Celsius and Fahrenheit when using medical devices calibrated in different scales.

Industrial & Engineering

Convert process temperatures for manufacturing, material science, and thermodynamic calculations across different measurement standards.

Science Education

Convert between Kelvin and Celsius for chemistry and physics coursework, especially for gas law calculations that require absolute temperature.

HVAC & Building

Convert thermostat settings and HVAC specifications between Celsius and Fahrenheit when working with equipment from different regions.

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