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Temperature Converter

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Convert between Celsius, Fahrenheit, and Kelvin instantly — edit any field and the other two update automatically.

temperature convertercelsius to fahrenheitkelvin converterunit converter
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Formulas used: °F = °C × 9/5 + 32, K = °C + 273.15. Editing any field instantly recalculates the other two. Kelvin cannot go below 0 (absolute zero, -273.15°C / -459.67°F) — the tool clamps to that floor if you enter a lower value.

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Frequently Asked Questions

What formulas does this use?

Fahrenheit is calculated as °C × 9/5 + 32, and Kelvin is calculated as °C + 273.15 — both are the standard, exact conversion formulas, not approximations.

Can I type a Fahrenheit or Kelvin value directly instead of Celsius?

Yes — all three fields are independently editable. Typing into any one of them instantly recalculates the other two using the appropriate inverse formula, so you can start from whichever unit you have.

Why does Kelvin get clamped at 0?

Zero Kelvin is absolute zero (-273.15°C / -459.67°F), the theoretical coldest possible temperature — nothing can go below it, so the tool prevents entering a negative Kelvin value that wouldn't correspond to any real temperature.

Are the results rounded?

Yes, all three fields display values rounded to 2 decimal places for readability, since temperature conversions rarely need more precision than that for everyday use.

Does this handle negative Celsius and Fahrenheit values correctly?

Yes — negative temperatures convert exactly the same way as positive ones using the same linear formulas; there's nothing special-cased about the sign except the Kelvin floor at absolute zero.

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