Free Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin instantly.
All conversions
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Temperature is measured in three different units depending on where you are in the world and what you are measuring: Celsius (°C), used by most countries for everyday temperatures; Fahrenheit (°F), used primarily in the United States; and Kelvin (K), the scientific standard used in physics, chemistry and engineering.
The ToolVerse AI Temperature Converter converts any temperature between all three units instantly. Enter your value, select the source and target units, and click convert. The tool also displays all three unit values simultaneously so you can see the full picture at a glance.
All calculations use the standard conversion formulas and run entirely in your browser, with results displayed to four decimal places for precision.
Limitation
A Few Gotchas
The most avoidable failure with Temperature Converter: Confusing a temperature value with a temperature difference. Everything else here is secondary.
- Confusing a temperature value with a temperature difference. Converting a temperature reading (like 20°C) uses a different formula than converting a temperature change (like a 20-degree rise). Mixing these up gives a meaningless result for difference calculations.
- Rounding Fahrenheit-Celsius conversions too aggressively. Because the conversion involves a non-round multiplier (9/5), rounding early can shift results by a degree or more in sensitive contexts like cooking or medical readings.
- Forgetting Kelvin has no negative values. Kelvin starts at absolute zero, so a converted result should never be negative. A negative Kelvin output signals an input or unit-selection error worth double-checking.
Quick Answers
What is the formula to convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (1.8) and then add 32. For example, 100°C = (100 × 9/5) + 32 = 212°F.
What is the formula to convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. For example, 72°F = (72 − 32) × 5/9 = 22.22°C.
What is absolute zero in all three scales?
Absolute zero — the theoretical lowest possible temperature — is 0 K, which equals −273.15°C or −459.67°F.
Why does science use Kelvin instead of Celsius?
Kelvin starts at absolute zero, which makes it useful for scientific calculations where temperatures below zero would create mathematical problems. Many physics and chemistry formulas require an absolute temperature scale.
What is normal human body temperature in all three scales?
Normal body temperature is approximately 37°C, 98.6°F, or 310.15 K.
Examples in Practice
- Body temperature: 98.6°F = 37°C (normal human body temperature)
- Oven setting: 180°C = 356°F — common baking temperature
- Freezing point: 0°C = 32°F = 273.15 K
- Boiling point: 100°C = 212°F = 373.15 K
The Basics
- Enter the temperature value you want to convert.
- Select the unit you are converting from (Celsius, Fahrenheit, or Kelvin).
- Select the unit you are converting to.
- Click Convert Temperature to see the result and the conversion formula used.
- The table below the result shows the value in all three units at once.
Core Capabilities of Temperature Converter
Nothing here requires setup, though this is easy to overlook on a first pass: Converts between Celsius, Fahrenheit and Kelvin in any direction.
- Converts between Celsius, Fahrenheit and Kelvin in any direction.
- Shows the conversion formula used for each calculation.
- Displays all three unit values in a single table for quick reference.
- Results to four decimal places for scientific accuracy.
- Runs entirely in your browser — no server, no data upload.
What You Gain
- Quickly understand weather temperatures when travelling between countries.
- Convert oven temperatures in recipes between metric and imperial.
- Students: convert between temperature scales for physics and chemistry homework.
- Scientists and engineers: convert to Kelvin for thermodynamic calculations.
- Free, instant and works offline once the page is loaded.
Temperature Reference Points
Understanding a few key reference temperatures helps you build an intuition for converting between scales quickly.
Water freezes at 0°C / 32°F / 273.15 K. This is the most commonly used reference point because it is easy to remember and observe directly.
Water boils at 100°C / 212°F / 373.15 K at standard atmospheric pressure (sea level). At high altitudes, water boils at a lower temperature because atmospheric pressure is reduced.
Normal body temperature is approximately 37°C / 98.6°F / 310.15 K. This is the average — healthy body temperature can range from 36.1°C to 37.2°C (97°F to 99°F).
A comfortable room temperature is around 20–22°C / 68–72°F / 293–295 K. This is the range most thermostats are set to in offices and homes.
Common baking temperatures range from 160–220°C / 325–425°F. If you are converting a recipe from a US cookbook (Fahrenheit) to a metric oven, this range covers most baking and roasting temperatures.