How do I convert Celsius to Fahrenheit?

Multiply the Celsius value by 9/5, then add 32. For example, 25°C equals 77°F.

How do I convert Fahrenheit to Celsius?

Subtract 32 from the Fahrenheit value, then multiply by 5/9. For example, 77°F equals 25°C.

What is absolute zero in each temperature scale?

Absolute zero is 0 Kelvin, -273.15°C, -459.67°F, 0 Rankine, -218.52°Ré, -90.14°N, -135.90°Rø and 559.725°De.

Why does the Kelvin scale have no negative values?

Kelvin is an absolute thermodynamic scale that starts at absolute zero, the coldest physically possible temperature, so it never goes below zero.

What is the Rankine scale used for?

The Rankine scale is an absolute temperature scale using Fahrenheit-sized degrees, occasionally used in older US engineering and thermodynamics contexts.

Who invented the Celsius scale?

Anders Celsius, a Swedish astronomer, proposed the scale in 1742, originally with 0 as boiling and 100 as freezing before it was later reversed.

Is the Réaumur scale still used today?

The Réaumur scale is largely historical today, though it still appears in some European cheesemaking and confectionery recipes.

How accurate is this temperature converter?

This tool performs all conversions through Kelvin using precise scientific formulas and displays results rounded to up to 12 decimal places.

What is 0°C in Kelvin?

0°C equals 273.15 Kelvin, which is the freezing point of water at standard atmospheric pressure.

What is body temperature in Fahrenheit and Celsius?

Normal human body temperature is about 37°C, which converts to approximately 98.6°F.

What is the Newton temperature scale?

The Newton scale was devised by Isaac Newton around 1701, setting the freezing point of water at 0 degrees Newton and boiling at 33 degrees Newton.

What is the Rømer scale?

The Rømer scale, created by Ole Rømer in 1701, sets water's freezing point at 7.5 degrees and boiling point at 60 degrees.

What is the Delisle scale and why is it inverted?

The Delisle scale, created by Joseph-Nicolas Delisle in 1732, runs in reverse: 0 degrees is boiling water and 150 degrees is freezing water.

Can this converter handle negative numbers and decimals?

Yes, the converter fully supports negative values, decimals, and scientific notation such as 1.5e3.

Does this temperature converter work offline?

Yes, once the page has loaded, all calculations run locally in your browser with no external API calls required.

How do I convert Kelvin to Celsius?

Subtract 273.15 from the Kelvin value. For example, 300 K equals 26.85°C.

What temperature is considered a fever in Celsius and Fahrenheit?

A fever is generally considered to start around 38°C, which is approximately 100.4°F.

Why does the tool convert through Kelvin internally?

Converting every unit to Kelvin first, then from Kelvin to the target unit, avoids compounding rounding errors from chaining multiple formulas together.

What is the boiling point of water in each scale?

Water boils at 100°C, 212°F, 373.15 K, 671.67 °R, 80°Ré, 33°N, 60°Rø and 0°De at standard atmospheric pressure.

Is ConvertGPT free to use?

Yes, ConvertGPT's temperature converter is completely free, requires no registration, and has no usage limits.

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Temperature Conversions

Scientifically precise

Temperature Converter

Convert temperatures instantly between Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Newton, Delisle and Rømer using precise scientific formulas with real-time calculations.

8Temperature scales

12Decimal precision

0msAPI calls needed

Conversion Formula

The exact scientific formula for your selected units, explained in plain English.

°F = (°C × 9⁄5) + 32

Multiply the Celsius value by nine-fifths, then add 32 to get the Fahrenheit value.

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Common values converted instantly for your selected units.

Celsius	Fahrenheit

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