How to Use This Tool
Enter a Temperature
Type the value you want to convert into the input field. Decimals and negative numbers are supported.
Choose Your Scales
Pick a From scale and a To scale from the dropdowns. Use the swap button to flip them instantly.
Read the Result
The converted temperature appears instantly below the inputs with the full formula shown. Click Copy to put it on your clipboard.
See All Four Scales
Below the main result, the All Conversions panel shows the same temperature in every other scale at once.
Frequently Asked Questions
Is this tool really free?
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Yes, completely free with no limits and no sign-up. Everything runs in your browser with no server costs.
Is my data sent to a server?
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No. All conversion math happens directly in your browser. Nothing you type is ever sent anywhere.
What temperature scales are supported?
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Four: Celsius (used worldwide for everyday temperatures), Fahrenheit (used mainly in the United States), Kelvin (used in science, starts at absolute zero), and Rankine (used in some engineering fields, starts at absolute zero on the Fahrenheit scale).
How do I convert Celsius to Fahrenheit?
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Just type the Celsius value, set From to Celsius and To to Fahrenheit, and the result appears instantly. The formula is (C x 9/5) + 32, but you do not need to remember it.
How do I convert Fahrenheit to Celsius?
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Type the Fahrenheit value, set From to Fahrenheit and To to Celsius, and the result appears instantly. The formula is (F - 32) x 5/9.
What is Kelvin?
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Kelvin is the scientific temperature scale. It starts at absolute zero (the coldest possible temperature, about -273.15 Celsius). Water freezes at 273.15 K and boils at 373.15 K.
What is Rankine?
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Rankine is like Kelvin but on the Fahrenheit scale. It also starts at absolute zero but uses Fahrenheit-sized degrees. It is mainly used in some engineering fields in the United States.
Can I enter negative temperatures?
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Yes. Negative values are fully supported, which is important for temperatures below zero in Celsius and Fahrenheit.
Can I see all four scales at once?
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Yes. The All Conversions panel below the main result shows the same temperature in every other scale simultaneously.
How accurate are the conversions?
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Results are displayed to 6 decimal places. The tool uses the standard conversion formulas, so results are accurate for everyday, educational, and professional use.
What Is Temperature Converter?
Temperature Converter is a free tool that converts between Celsius, Fahrenheit, Kelvin, and Rankine right in your browser. Type a temperature, pick your scales, and see the result instantly. The All Conversions panel shows the same value in every other scale at once, so you never have to convert one pair at a time. Nothing you type is ever sent anywhere - all math runs locally on your device.
Temperature conversion uses formulas (not simple multiplication), and the tool handles them all for you. Whether you are converting a weather forecast, a recipe, a science problem, or an engineering spec, just type the number and read the answer.
Features Explained
Four Temperature Scales
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Convert between Celsius, Fahrenheit, Kelvin, and Rankine. These cover everyday, scientific, and engineering temperature needs.
Celsius and Fahrenheit
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The two most common scales for daily life. Celsius is used worldwide; Fahrenheit is used mainly in the United States. The tool converts between them instantly.
Kelvin for Science
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Kelvin starts at absolute zero and is the standard scale in physics, chemistry, and engineering. Water freezes at 273.15 K and boils at 373.15 K.
Rankine for Engineering
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Rankine also starts at absolute zero but uses Fahrenheit-sized degrees. It is used in some thermodynamic and engineering calculations.
Instant Conversion
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The result updates live as you type. There is no Convert button to click - you see the answer the moment your input changes.
All Conversions at Once
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Below the main result, the All Conversions panel shows the same temperature in every other scale simultaneously, so you can read all three other values in one glance.
Formula Display
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The result line shows the full equation (for example 100 C = 212 F) so you can verify and reference the conversion at a glance.
Swap Button
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Click the swap button between the From and To dropdowns to flip them instantly. The result recalculates right away.
Copy to Clipboard
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Click Copy to put the converted value on your clipboard instantly, ready to paste into a document, spreadsheet, or message.
100% Browser-Based
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All conversion math runs directly in your browser. Nothing you type is ever sent to any server - complete privacy.
Who Is This Tool For?
Travelers
Convert weather forecasts between Celsius and Fahrenheit to understand what to pack and wear in your destination.
Home Cooks and Bakers
Convert oven temperatures between Celsius and Fahrenheit when following recipes from different countries.
Students
Convert temperatures for physics, chemistry, and science homework. Kelvin is essential for many science problems.
Teachers
Demonstrate temperature conversions in real time during lessons and help students understand the four scales.
Scientists
Convert between Celsius and Kelvin for lab work, research papers, and experimental data.
Engineers
Convert between Rankine, Kelvin, and Fahrenheit for thermodynamic calculations and engineering specifications.
Healthcare Professionals
Convert patient temperatures between Celsius and Fahrenheit when using equipment or records in different units.
Parents
Convert your child's temperature reading between Celsius and Fahrenheit to understand fever thresholds.
Weather Enthusiasts
Convert temperatures from international weather reports between Celsius and Fahrenheit for comparison.
Expats and Immigrants
Adjust to a new country's temperature scale by quickly converting weather, cooking, and thermostat readings.
HVAC Technicians
Convert thermostat and system temperatures between Celsius and Fahrenheit when working with imported equipment.
Brewers and Winemakers
Convert fermentation and mashing temperatures between Celsius and Fahrenheit for recipes from different regions.
Gardeners
Convert frost and soil temperature guidelines between Celsius and Fahrenheit for planting schedules.
Photographers
Check operating temperature limits for camera gear by converting between the scales listed in equipment manuals.
Pilots
Convert between Celsius and Fahrenheit for weather briefings, aircraft performance charts, and cockpit instruments.
3D Printing Enthusiasts
Convert nozzle and bed temperatures between Celsius and Fahrenheit when following guides from different regions.
Aquarium Hobbyists
Convert tank water temperatures between Celsius and Fahrenheit for fish care guides and heater settings.
Food Safety Inspectors
Convert food storage and cooking temperatures between Celsius and Fahrenheit for compliance and reporting.
Journalists
Convert temperature figures in international stories so readers in different countries understand the context.
Outdoor Adventurers
Convert weather and gear temperature ratings between Celsius and Fahrenheit when planning hikes, camping, or ski trips.
Crafters
Convert kiln and heat-tool temperatures between Celsius and Fahrenheit when following pottery, resin, or metalwork instructions.
Mechanics
Convert engine and fluid operating temperatures between Celsius and Fahrenheit for maintenance and diagnostics.
Researchers
Convert experimental temperatures between Kelvin and Celsius for publications and cross-referencing data.
Anyone
Quickly convert any temperature for any reason - weather, cooking, science, curiosity, or work.
Tips for Best Results
Common reference points
Water freezes at 0 C / 32 F / 273.15 K. Water boils at 100 C / 212 F / 373.15 K. Normal body temperature is about 37 C / 98.6 F.
Quick mental estimate for C to F
Double the Celsius value and add 30 for a rough estimate. For example, 20 C is roughly 20 x 2 + 30 = 70 F (exact is 68 F). Good enough for weather.
Quick mental estimate for F to C
Subtract 30 and halve the result. For example, 80 F is roughly (80 - 30) / 2 = 25 C (exact is 26.67 C).
Use the swap button
Click the swap button between the dropdowns to flip From and To instantly instead of changing both dropdowns manually.
Check all four scales at once
The All Conversions panel below the main result shows the same temperature in every other scale. Use it when you need Celsius, Fahrenheit, and Kelvin at the same time.
Negative temperatures are fine
The tool handles negative values, which is important for sub-zero weather, freezer temperatures, and science problems involving cryogenic ranges.
Kelvin has no degree symbol
Kelvin is written as just K, not degrees K. The tool handles this correctly. For example, 300 K, not 300 degrees K.
Rankine for US engineering
Rankine is mainly used in thermodynamic calculations in the United States. It starts at absolute zero like Kelvin but uses Fahrenheit-sized degrees.
Copy the result in one click
Click Copy next to the result to put the value on your clipboard, ready to paste into a spreadsheet, document, or message.
Privacy is built in
Nothing you type is ever sent to any server. All math runs in your browser, so your data stays completely private.
Privacy & Security
This tool runs 100% in your browser. Your files stay entirely on your own device. Nothing is uploaded, nothing is shared, and no server, advertiser, or third party has access to your files.
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