Temperature Converter

Q: What is the difference between Celsius and Centigrade?

They're the same thing. 'Centigrade' is the older name; 'Celsius' was officially adopted in 1948 to honor Swedish astronomer Anders Celsius.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. All calculations run in your browser — nothing is sent or stored.

From

Result

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Celsius—

Fahrenheit—

Kelvin—

Rankine—

Quick Reference

Water freezes: 0°C = 32°F = 273.15 K
Water boils: 100°C = 212°F = 373.15 K
Room temperature: ~20°C = 68°F = 293.15 K
Body temperature: 37°C = 98.6°F = 310.15 K
Absolute zero: -273.15°C = -459.67°F = 0 K

How to Use the Temperature Converter

Enter the temperature value in the "From" field.
Select the source unit (Celsius, Fahrenheit, Kelvin, or Rankine).
Choose the target unit you want to convert to.
The converted result appears instantly — plus all four units in the comparison grid below.
Use the ⇅ button to swap source and target units.

What Is a Temperature Converter?

A temperature converter translates a temperature value between different measurement scales. Unlike length or weight, temperature scales have different zero points and step sizes, so conversion requires formulas with offsets — not just multiplication. Our converter handles the four major scales: Celsius (used worldwide), Fahrenheit (used in the US), Kelvin (the SI scientific standard), and Rankine (used in some US engineering fields).

Conversion Formulas

°C to °F — (°C × 9/5) + 32
°F to °C — (°F − 32) × 5/9
°C to K — °C + 273.15
K to °C — K − 273.15
°F to K — (°F − 32) × 5/9 + 273.15
°R to K — °R × 5/9

Common Uses for a Temperature Converter

Cooking & baking — convert oven temperatures between °C and °F for international recipes.
Weather & travel — understand forecasts when traveling between metric and US regions.
Science & education — convert between Kelvin and Celsius for physics and chemistry problems.
Engineering — work with Rankine in thermodynamics calculations.
Health — convert body temperature readings between scales.
HVAC & climate control — match thermostat settings between systems using different units.

Why Choose Our Temperature Converter

Privacy-first — 100% browser-based. Nothing leaves your device.
Instant — live conversion as you type, no submit button.
All-in-one view — see all four scales at once in the comparison grid.
Accurate — uses precise constants (273.15, 459.67, 5/9, 9/5).
No signup, no tracking, no ads in your data.

Frequently Asked Questions

What is the difference between Celsius and Centigrade?

They're the same thing. "Centigrade" is the older name; "Celsius" was officially adopted in 1948 to honor Swedish astronomer Anders Celsius.

Why is Kelvin used in science?

Kelvin starts at absolute zero (the theoretical lowest possible temperature). This makes calculations involving gas laws, thermodynamics, and statistical mechanics much cleaner because there are no negative temperatures.

What is Rankine used for?

Rankine is an absolute scale (like Kelvin) but uses Fahrenheit-sized degrees. It's used mainly in US engineering disciplines, especially thermodynamics and aerospace.

Is -40°C the same as -40°F?

Yes — this is the only point where Celsius and Fahrenheit scales intersect.

Does this work offline?

Yes, once the page is loaded all conversions run locally in your browser.