Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly. No signup, 100% free and private.
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Common References
Oven Temperatures
Tip: Gas Mark 4 = 350°F = 180°C (Medium Heat)
Conversion Formulas
Celsius ↔ Fahrenheit
°F = (°C × 9/5) + 32°C = (°F - 32) × 5/9Celsius ↔ Kelvin
K = °C + 273.15°C = K - 273.15Quick Estimate
°C → °F: Double + 30°F → °C: Subtract 30, halveWhy Choose Filator's Temperature Converter?
Instant Results
Convert temperatures in real-time as you type. No waiting, no server requests—just instant, accurate results.
100% Private
All calculations happen in your browser. Your data never leaves your device—complete privacy guaranteed.
All Major Scales
Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Reaumur—covering all scientific and everyday needs.
How to Convert Temperature Online for Free
Filator's free temperature converter lets you instantly convert between Celsius, Fahrenheit, and Kelvin directly in your browser—no signup required, no server uploads, complete privacy. Unlike competitors that require JavaScript-heavy interfaces with ads, Filator offers a clean, fast experience that works offline and on any device.
Why Choose Filator's Temperature Converter?
Instant Real-Time Conversion
See results as you type with zero delay. No need to click "Convert" buttons or wait for server responses—everything happens instantly in your browser.
Complete Privacy
All calculations happen client-side in your browser. Your temperature values never leave your device—unlike online tools that process data on their servers.
All Temperature Scales
Convert between Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R), and Reaumur (°Ré)— covering scientific, everyday, and historical temperature scales.
Works Offline
Install as a PWA and convert temperatures without internet. Perfect for field work, travel, or anywhere you need quick conversions without connectivity.
How to Convert Temperature Step-by-Step
- 1.Enter your temperature value in the input field
- 2.Select the source temperature scale (Celsius, Fahrenheit, or Kelvin)
- 3.View instant conversions to all other temperature scales
- 4.Copy results or view the conversion formula used
Temperature Conversion Formulas
| Conversion | Formula | Example |
|---|---|---|
| Celsius to Fahrenheit | °F = (°C × 9/5) + 32 | 25°C = 77°F |
| Fahrenheit to Celsius | °C = (°F - 32) × 5/9 | 77°F = 25°C |
| Celsius to Kelvin | K = °C + 273.15 | 25°C = 298.15K |
| Kelvin to Celsius | °C = K - 273.15 | 298.15K = 25°C |
| Fahrenheit to Kelvin | K = (°F + 459.67) × 5/9 | 77°F = 298.15K |
| Kelvin to Fahrenheit | °F = (K - 273.15) × 9/5 + 32 | 298.15K = 77°F |
Common Temperature Reference Points
| Reference Point | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute Zero | -273.15°C | -459.67°F | 0 K |
| Water Freezing Point | 0°C | 32°F | 273.15 K |
| Room Temperature | 20-22°C | 68-72°F | 293-295 K |
| Human Body Temperature | 37°C | 98.6°F | 310.15 K |
| Water Boiling Point | 100°C | 212°F | 373.15 K |
Understanding Temperature Scales
Celsius (°C)
The Celsius scale, also known as Centigrade, is used worldwide for everyday temperature measurements. It's defined by the freezing point of water (0°C) and boiling point (100°C) at standard atmospheric pressure. Named after Swedish astronomer Anders Celsius.
Fahrenheit (°F)
The Fahrenheit scale is primarily used in the United States for weather and everyday temperatures. Water freezes at 32°F and boils at 212°F. Named after German physicist Daniel Gabriel Fahrenheit who invented the mercury thermometer.
Kelvin (K)
Kelvin is the SI unit of temperature used in science. It starts at absolute zero (the coldest possible temperature) and uses the same increment size as Celsius. Unlike other scales, Kelvin doesn't use the degree symbol—it's simply "K" not "°K".
Common Use Cases
Weather Forecasts
Convert weather temperatures between Celsius and Fahrenheit when traveling internationally or reading foreign weather reports
Cooking Recipes
Convert oven temperatures between Celsius and Fahrenheit when following recipes from different countries
Scientific Research
Convert between Kelvin and Celsius for laboratory work, physics calculations, and scientific papers
Medical & Health
Convert body temperature readings between Celsius and Fahrenheit for health monitoring and medical records
Frequently Asked Questions
How do you convert Celsius to Fahrenheit?
To convert Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8) and add 32. The formula is: °F = (°C × 9/5) + 32. For example, 25°C = (25 × 1.8) + 32 = 77°F. A quick estimation trick: double the Celsius value and add 30 for a rough approximation.
How do you convert Fahrenheit to Celsius?
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature and multiply by 5/9. The formula is: °C = (°F - 32) × 5/9. For example, 77°F = (77 - 32) × 5/9 = 25°C.
How do you convert Celsius to Kelvin?
To convert Celsius to Kelvin, simply add 273.15 to the Celsius temperature. The formula is: K = °C + 273.15. For example, 25°C = 25 + 273.15 = 298.15K. Remember that Kelvin doesn't use the degree symbol.
What is normal human body temperature?
Normal human body temperature is approximately 37°C or 98.6°F. However, normal body temperature can range from 36.1°C to 37.2°C (97°F to 99°F) depending on the individual, time of day, and measurement location.
What is absolute zero?
Absolute zero is the lowest possible temperature where all molecular motion stops. It equals 0 Kelvin, -273.15°C, or -459.67°F. This is a theoretical limit that cannot be reached in practice, though scientists have come very close.
What's the difference between Celsius and Centigrade?
Celsius and Centigrade are the same temperature scale. The name was officially changed from Centigrade to Celsius in 1948 to honor Swedish astronomer Anders Celsius who invented the scale.
Why does the US use Fahrenheit?
The US uses Fahrenheit for historical reasons—it was the standard when the country was founded. While most countries adopted the metric system in the 1970s, the US retained Fahrenheit for everyday use due to familiarity and the cost of conversion.
Is this temperature converter free to use?
Yes, Filator's temperature converter is completely free with no signup required. All conversions happen instantly in your browser (client-side), so your data never leaves your device. There are no usage limits or premium features.
Ready to Convert Temperatures?
Start converting temperatures instantly with no signup, complete privacy, and support for all major temperature scales. Whether you need Celsius to Fahrenheit for cooking, Kelvin for science, or any other conversion—Filator has you covered.