Temperature Unit Converter

Free temperature converter. Instantly convert between Celsius, Fahrenheit, and Kelvin with exact formulas and a quick reference chart. Use our free calculator n

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Temperature Conversion Formulas

Temperature is measured in different scales worldwide. Celsius is used in most countries, Fahrenheit in the US, and Kelvin in scientific contexts.

Conversion Formulas

FromToFormula
CelsiusFahrenheitF = (C x 9/5) + 32
FahrenheitCelsiusC = (F - 32) x 5/9
CelsiusKelvinK = C + 273.15
KelvinCelsiusC = K - 273.15

Key Reference Points

DescriptionCelsiusFahrenheitKelvin
Absolute zero-273.15-459.670
Water freezes032273.15
Body temperature3798.6310.15
Water boils100212373.15

Memorable Shortcuts

  • 30-0-30 rule: 30 C = 86 F (hot day), 0 C = 32 F (freezing), -30 C = -22 F (very cold)
  • Roughly: double Celsius and add 30 for a quick Fahrenheit estimate
  • Exactly -40: the only temperature equal in both Celsius and Fahrenheit

How to Use This Calculator

Using our calculator is simple: enter the required values into the input fields and click the calculate button. Results are displayed instantly on screen. You can adjust the values and recalculate to compare different scenarios and find the best option for your situation.

Frequently Asked Questions

QuestionAnswer
How accurate are the results?We use standard formulas and up-to-date 2025 rates. Individual circumstances may vary slightly.
Is this calculator free?Yes, completely free and no registration required.
What should I do for exact figures?For precise information, consult a relevant professional or official authority.
Does it work on mobile devices?Yes, it works seamlessly on all devices and screen sizes.

Important Notes

This calculator is provided for informational purposes only. For legal, financial, or medical decisions, always seek advice from qualified professionals. Calculation results do not constitute official documents. Legislative changes may affect results; please visit the relevant official website for the most up-to-date information. Our calculators are regularly updated to reflect current regulations and rates.

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Frequently Asked Questions

F = (C × 9/5) + 32. For example, 100°C = (100 × 1.8) + 32 = 212°F.
Absolute zero is 0 Kelvin = -273.15°C = -459.67°F. It is the lowest possible temperature where particles have no thermal motion.
At -40°. At this point -40°C = -40°F.